CN108007561B - Probe microphone high temperature calibrating installation - Google Patents
Probe microphone high temperature calibrating installation Download PDFInfo
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- CN108007561B CN108007561B CN201711318129.7A CN201711318129A CN108007561B CN 108007561 B CN108007561 B CN 108007561B CN 201711318129 A CN201711318129 A CN 201711318129A CN 108007561 B CN108007561 B CN 108007561B
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- 239000000523 sample Substances 0.000 title claims abstract description 117
- 238000009434 installation Methods 0.000 title claims abstract description 28
- 238000002955 isolation Methods 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 7
- 239000003566 sealing material Substances 0.000 claims description 6
- 230000004044 response Effects 0.000 claims description 5
- 238000003780 insertion Methods 0.000 claims description 4
- 230000037431 insertion Effects 0.000 claims description 4
- 230000008676 import Effects 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 2
- 229920006351 engineering plastic Polymers 0.000 claims description 2
- 239000011214 refractory ceramic Substances 0.000 claims description 2
- 230000035945 sensitivity Effects 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims 1
- 238000005192 partition Methods 0.000 abstract description 8
- 238000010168 coupling process Methods 0.000 abstract description 7
- 238000005859 coupling reaction Methods 0.000 abstract description 7
- 230000008878 coupling Effects 0.000 abstract description 6
- 238000013461 design Methods 0.000 description 14
- 238000010586 diagram Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 239000004831 Hot glue Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000005194 fractionation Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000001931 thermography Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H17/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups
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- General Physics & Mathematics (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
The present invention relates to a kind of probe microphone high temperature calibrating installations, belong to acoustic metrology calibration field.For the special needle tube shape structure in probe microphone head, and the characteristics of being used under hot environment, devise the hot plug structure of three way type with half partition, the high temperature calibration coupling cavity configuration of new inner hollow, it ensure that probe microphone is consistent with the sound field environment of standard microphone but thermal field is mutually isolated, probe microphone individually can be heated and be calibrated.Compared with the general calibrating installation of existing conventional microphone, the calibrating installation specialized application and probe microphone, high temperature calibration can be carried out to probe microphone, it is consistent probe microphone calibration environment with true use environment, to improve the accuracy and credibility of probe microphone calibration result.
Description
Technical field
The present invention relates to a kind of probe microphone high temperature calibrating installations, belong to acoustic metrology calibration field.
Background technique
Currently, the collimation techniques such as coupler reciprocal method or comparison method for conventional microphone are ripe day by day, due to normal
It advises microphone size and has standard specification (1,1/2,1/4,1/8 inch etc.), use environment is also room temperature, therefore its calibration cartridge
Setting can be general, and calibration accuracy is also guaranteed.
However probe microphone belongs to special type microphone, shape is more special with structure, and head installs probe additional, is used to
It probes into high-temperature area and carries out acoustic measurement, calibration has two: first, probe microphone is applied to hot environment, such as
Fruit is calibrated under normal temperature environment, the inconsistent accuracy that can reduce calibration result and credible journey of calibration and use environment
Degree；Second, probe microphone head has seeker, directly can not symmetrically pacify in conventional coupler with standard microphone
Dress, both can not direct-coupling.
First problem there is no preferable solution at present.For Second Problem, at present solution be producer or
Person's calibration personnel manufactures switching tooling for the probe of microphone head, i.e., is socketed standard size tooling on probe, then inserts
Enter into conventional coupler and is calibrated.However the program in turn again brings a negative impact the solution of first problem, i.e.,
Socket tooling has sheltered from probe, it is made to be difficult to be heated progress high temperature calibration.
Therefore, probe microphone high temperature calibrating installation needs are specially designed, and develop the socket tooling that can lead to thermal current
With matched coupler, while probe heating and switching two are solved the problems, such as, and the two is independent of each other, so as to pass to probe
Sound device carries out high temperature calibration, is consistent probe microphone calibration environment with true use environment, improves probe microphone school
The accuracy and credibility of quasi- result.
In acoustic metrology calibration field, in existing patent or application technology, as CN101895809A,
CN102611982A, CN203463653U etc., most acoustic calibration's technologies under normal temperature environment, device or utensil research
Based on, it is therefore intended that acoustic calibration's accuracy under normal temperature environment is improved, but lacks the correlative study of hot environment acoustic calibration.And incite somebody to action
Application range shorter is then calibrated correlative study and is more lacked to probe microphone, only certain external probe microphone systems
It makes manufacturer and devises the switching tooling and calibration utensil that some are adapted to oneself product, and be not related to high temperature.
The present invention and existing patent the difference is that: the present invention is directed to probe microphone, and unconventional microphone or its
His type microphone；The present invention is calibrated for high temperature, rather than room temperature is calibrated.The main devices such as hot plug, coupler are directed to probe
The high temperature calibration of microphone has carried out special design.Wherein heat plug uses the three-port structure of inner hollow, and both ends lead to high temperature gas flow,
One end leads to sound wave, and probe microphone can be made to be in high temperature hot gas stream environment, while can receive sound wave again, but be isolated in structure
Temperature field and sound field；The diameter of Re Saitong sound wave one end and standard English microphone diameter specifications match (need to cover 1 inch,
The plurality of specifications such as 1/2 inch, 1/4 inch, 1/8 inch), guarantee and standard microphone is to coupling, and guaranteeing can be in existing standard
It is general on the vertical coupler of size；Heat plug separates with internal half, can make uniform temperature fields locating for probe microphone；Heat plug
It is using two-section separated design, the part to match with probe is independent, it is threadedly coupled with main part, it is convenient to difference
The probe of size carries out replacement matching, improves versatility；High temperature calibration using heat plug isolation design, that is, is meeting heat with coupler
On the basis of plug can be coupled with standard microphone, Re Sai is isolated with cavity, avoids heat plug by heat by design isolation liner
It is conducted to coupler cavity, influences the uniformity of coupler internal temperature.In conclusion the present invention is probe microphone high temperature school
Quasi- dedicated unit can carry out high temperature calibration to probe microphone, protect probe microphone calibration environment and true use environment
It holds unanimously, to improve the accuracy and credibility of probe microphone calibration result.
Summary of the invention
The object of the present invention is to provide one kind exclusively for high temperature calibrating installation used in probe microphone, so as to right
Probe microphone carries out high temperature calibration, improves probe microphone calibration accuracy and confidence level.
The purpose of the present invention is what is be achieved through the following technical solutions.
Probe microphone high temperature calibrating installation, comprising: coupler, isolation liner, standard microphone, air inlet pipe, probe pass
Sound device, sealing material, escape pipe, heat plug main body and sound source.
The coupler is made of lower coupler and upper coupler
The isolation liner is cylindrical body or square body with deep trouth；
The heat plug main body is positive center with through-hole T-type structure, opens up air channel along inward at both ends at the top of T-type, needs to protect
Two air channels are demonstrate,proved to keep at a distance with central through hole；Open up U-shaped air channel inside T-type lower cylinder, the U-shaped air channel with
Two air channels are connected, and constitute vent line；
Sound source, lower coupler and upper coupler are fixedly connected sequentially；Two isolation liners are symmetrically and fixedly mounted to coupler
On wall surface, it is respectively used to installation standard microphone and Re Sai main body；Air inlet pipe and an air outlet pipe is fixedly mounted on heat plug main body two sides；
In the through-hole of the probe insertion heat plug main body of probe microphone, and seals and fix by sealing material；
The diameter of the standard microphone is identical as the heat plug diameter of lower cylinder of main body；
The top of probe is flushed with the bottom end of heat plug main body；
The isolation liner is symmetrically and fixedly mounted on coupler；
The isolation liner is symmetrically and fixedly mounted on lower coupler side wall；
The material of the isolation liner need to be high temperature resistant and the lower material of thermal conductivity, such as refractory ceramics or high temperature resistance super
Kind engineering plastics etc..
The course of work: after checking that installation is errorless, first turning on hot gas source, imports thermal current in heat plug by air inlet pipe, and
It is exported by escape pipe, probe is heated, thermometric is carried out to the probe inside heat plug by the position of escape pipe during heating
(wire type temperature probe can be used to probe into the modes such as contact thermography, infrared ray non-contact temperature measuring)；Then, until temperature reaches expected temperature
Degree or more, control sound source records real time temperature, standard microphone response, is calibrated probe microphone according to vertification regulation sounding
Response；It after the measurement of all temperature gears, carries out position and exchanges, i.e., connect standard microphone with probe microphone is calibrated
Other side is mutually changed to heat plug to be isolated in liner, repeats above step；After data record, hot gas source and sound source are closed；Most
Afterwards according to the calculating step of existing coupler comparison method, the sensitivity school that probe microphone is calibrated under different temperatures gear is calculated
Quasi- result.
Firstly, devising the new threeway of one kind, two-section separated, diameter covers standard English microphone diameter specifications, interior
The heat plug that portion half separates.Due to probe microphone head have seeker, can not in conventional coupler with standard microphone
It is directly symmetrically installed, it is necessary to transfer, it is contemplated that probe diameter only has several millimeters, and one can only be generally socketed outside probe directly
Diameter is inserted into coupler, to dimensionally match with standard microphone with to the identical switching tooling of coupling standard microphone diameter
It closes.However problem is that switching tooling covers on probe, has been completely covered by probe, be placed in probe can not in thermal environment, also very
Difficulty takes heating measures to probe, and then can not carry out high temperature calibration to probe microphone.Therefore the present invention has redesigned one
The switching tooling of kind entitled heat plug, core ideas are to fill in internal build thermal environment in heat, while solving heating and asking with transferring two
Topic.Inner hollow, threeway mode are designed as in structure, opposite both ends lead to thermal current, and one end vertical with the two leads to sound wave, lead to
The hole of sound wave is identical as probe diameter, and when probe microphone is packed into heat plug, the thermal environment inside heat plug can be carried out probe
Heating, and logical sound wave hole is inserted into probe end face, can directly contact with the sound field of heat beyond the Great Wall, simultaneously because probe diameter and logical sound
Wave hole diameter is identical, just blocks logical sound wave hole completely, be leaked to the thermal current of Re Sainei will not in external sound field, to reach
The purpose being isolated to temperature field while heating to probe with sound field；Secondly, not in view of probe size specification on the market
Together, and logical sound wave hole needs strictly to match with the size of probe, therefore heat plug uses two-section separated design, by logical sound wave hole
Part it is independent, be designed to heat plug lower cover form, with heat plug main part be threadedly coupled, only to various sizes of probe
Heat plug lower cover is needed to change, improving versatility, (other holes do not need strictly to match with probe, therefore design aperture ratio market
Upper probe size is bigger, does Simple sealing using modes such as raw material band, hot melt adhesive when calibration)；Again, Re Saitong sound wave one
There are also switchings to act at end, needs to couple with standard microphone, therefore it designs outer diameter and must advise with standard English microphone diameter
Lattice match and (need to cover the plurality of specifications such as 1 inch, 1/2 inch, 1/4 inch, 1/8 inch)；Finally, to guarantee Re Sainei temperature
Uniformly, inside is handled using half partition for field, makes thermal current that must go over hot plug along partition internal.Finally, by designing above, heat
Plug is internal will to provide a uniform, closed temperature field for probe, and switching is still played the role of in outside, i.e., solve probe simultaneously
Two problems of heating and switching, so that calibrating the high temperature of probe microphone becomes feasible.
Secondly, devise it is a kind of new, fill in matched high temperature calibration coupler with heat.There is High Temperature Gas since heat plug is internal
Stream passes through, and outer wall can inevitably distribute certain heat, these heats reach coupler cavity by heat transfer, causes coupler chamber
Temperature height is uneven, and the cavity temperature by near-thermal plug is higher, otherwise relatively low, and it is also uneven in turn result in its interior temperature distribution
It is even, it influences to calibrate sound field reliability.Therefore the present invention has redesigned a kind of high temperature calibration coupler, i.e. coupler wall surface
The design of microphone installation pore size is greater than microphone diameter, and liner, installation is isolated using not transcalent design of material
In microphone mounting hole, it can guarantee that heat plug can be coupled with standard microphone in this way, in turn avoid heat plug and pass heat
It leads and gives coupler cavity, to ensure that coupler interior environment temperature is uniform.It should be noted that, although being wanted according to heat-insulated
It asks, only in the disposition design isolation of heat plug installation position, but according to the requirement of sound calibration coupling, it is necessary to also in standard microphone
The isolation that position disposition designs identical dimensional structure is filled, to meet two installation site sound fields symmetrically and installation can be interchanged.
Beneficial effect
The present invention considers the high temperature calibration requirements of the special shape and structure of probe microphone and special operation condition, to switching
Tooling and coupler redesign, and have invented hot plug and high temperature calibration coupler, provide a uniform, envelope for probe microphone
The temperature field closed, while meeting the decoupling calls in comparison method with standard microphone, and have certain versatility, realize probe
The high temperature of microphone is calibrated.Compared with the general calibrating installation of existing conventional microphone, which is more applicable in and probe
Microphone can occasionally widen probe microphone calibration temperature range, thus improve the accuracy of probe microphone calibration result with can
Letter degree.
Detailed description of the invention
Fig. 1 is general structure schematic diagram of the invention；
Fig. 2 is that 3D assembly of the invention splits schematic diagram；
Fig. 3 is the gradient half-section diagram of heat plug main body of the invention；
Fig. 4 is the vertical design diagram that the present invention changes according to different demands.
Wherein, the upper coupler of coupler, 2-, 3- isolation liner, 4- standard microphone, 5- air inlet pipe, 6- probe pass under 1-
Sound device, 7- sealing material, 8- escape pipe, 9- heat plug main body, 10- heat plug lower cover, 11- sound source.
Specific embodiment
With reference to the accompanying drawing with example, realization of the invention is described in detail.
Embodiment 1
Overall structure is as shown in Figure 1, and be aided with 3D assembly fractionation as Fig. 2 is supplemented.Calibration object is disposable type spy
Needle microphone 6, reference object are standard microphone 4.Device noumenon includes two large divisions: one, high temperature calibration coupler (lower coupling
Close chamber 1, upper coupler 2, isolation liner 3, sound source 11), for the sound field environment of probe microphone calibration；Two, heat plug (heat plug main body
9, heat plug lower cover 10, air inlet pipe 5, escape pipe 8), for the thermal field environment and switching tooling of probe microphone calibration.
For the ease of machining, heat plug main body 9 is divided for heat body and the processing of 10 two parts of Re Sai lower cover beyond the Great Wall；Heat is beyond the Great Wall
Body is positive the intermediate T-type structure for having through-hole, opens up air channel along inward at both ends at the top of T-type, need to guarantee two air channels and center
Through-hole is kept at a distance；Open up two symmetrical ventilation deep trouths upwards along T-type bottom, need to guarantee this two ventilation deep trouths respectively with institute
Air channel is stated to communicate；Heat plug lower cover 10 is processed into reeded cylindrical body, is provided with central through hole at groove bottom center；It is described
The lead to the hole site of body is corresponding beyond the Great Wall with heat for central through hole；Finally heat plug lower cover 10 is fixedly mounted on hot body beyond the Great Wall and forms heat plug
Main body 9；
Before calibration, first do following assembly: sound source 11 is mounted under lower coupler 1 by coupling cavity segment using screw
Surface, and two isolation liners 3 being mounted in two mounting holes of upper coupler 2 using screw, then by lower coupler 1 with
Upper 2 abutting joint of coupler (preferred screw thread mounting means, sealing need to be carried out by such as designing other mounting means), and standard is transaudient
Device 4 is inserted in side isolation liner 3.Hot plug portion, heat plug main body 9 and heat plug 10 abutting joint of lower cover (preferred screw thread installation side
Formula, sealing need to be carried out by such as designing other mounting means), air inlet pipe 5 and escape pipe 8 are socketed in thermally conductive the two of heat plug main body 9 respectively
On end.
When calibration, first the probe of probe microphone 6 is always plugged in probe by heat plug 9 top pin hole of main body insertion
Enter into the pin hole of heat plug lower cover 10, flushes the lower end surface of probe with heat plug 10 outside lower end surface of lower cover, and heat is filled in lower cover
10 pin hole is blocked completely, then encapsulates heat plug main body using sealing material 7 (raw material band, high temperature resistant flexible glue and ooze etc.)
9 top pin holes, fix probe microphone 6, and make heat plug is internal to form individual cavities, finally by the heat plug lower cover 10 1 of heat plug
End is inserted in downwards in other side isolation liner 3, is checked no problem, is then opened hot gas source, thermal current is made to import hot plug by air inlet pipe 5
In, and exported by escape pipe 8.
It illustrates, as shown in figure 3, half partition-type structures are used inside hot plug main body 9, partition a and the insertion of half partition
The probe of probe microphone 6 jointly separates the inside of heat plug main body 9, can't be direct when thermal current is imported by air inlet pipe 5
It flows out, but is first hit on the probe of partition a and probe microphone 6 from escape pipe 8, then due to air pressure, thermal current meeting
Continuation flows downward along partition a and the probe of probe microphone 6, flow to always in the bottom cavity b of heat plug lower cover 10, then
The other side around partition a flows up, and is finally exported by escape pipe 8.By this process, thermal current will flow through Re Sainei
Portion completely attaches to probe, to form more uniform temperature field inside heat plug, is evenly heated to probe.
As above all after the assembly is completed, control sound source 11 is according to vertification regulation sounding, record and standard of comparison microphone 4 with
It is calibrated the response of probe microphone 6, position is then carried out and exchanges, i.e., connect standard microphone 4 with probe microphone 6 is calibrated
Other side is mutually changed to heat plug to be isolated in liner 3, repeats above step, is exchanged front and back two times result by processing, can tentatively be supported
The device that disappears processes bring asymmetric error, to carry out accurate high temperature comparison method calibration to probe microphone 6 is calibrated.
For the probe microphone 6 of different model, the bottom pin hole that heat plug lower cover 10 can be changed according to its probe size is straight
Diameter, due to its simple structure, easy making process is suitble to fast custom and assembly, thus reduce to the greatest extent calibration cycle at
This, and improve the versatility of device.
Currently, the model machine heating temperature that has a fling at of this patent is 100 DEG C, calibration frequency range is 200Hz~5000Hz,
1000Hz calibration uncertainty is can be controlled within 0.6dB (k=2), can cover the related mark such as GJB150.25A-2009 substantially
For the requirement of high temperature noise testing calibration in standard.Therefore this patent has preferable feasibility and application, and can pass through
Upgrading hot gas source and sound source reach higher temperature and broader calibration frequency, and tool has greater room for improvement.
Embodiment 2
In addition, according to different demands, the present invention is also designed to vertical design, as shown in figure 4, principle and application method
With Fig. 1 design and vertical structure it is completely the same, only standard microphone 4 and probe microphone 6 are changed to pair by installation of existing side by side
Vertical installation.
Above-described specific descriptions have carried out further specifically the purpose of invention, technical scheme and beneficial effects
It is bright, it should be understood that the above is only a specific embodiment of the present invention, the protection model being not intended to limit the present invention
It encloses, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should be included in the present invention
Protection scope within.
Claims (7)
1. probe microphone high temperature calibrating installation, it is characterised in that: include: coupler, isolation liner (3), standard microphone
(4), air inlet pipe (5), probe microphone (6), sealing material (7), escape pipe (8), heat plug main body (9) and sound source (11)；
The coupler is made of lower coupler (1) and upper coupler (2)
Isolation liner (3) is cylindrical body or square body with deep trouth；
Heat plug main body (9) is positive center with through-hole T-type structure, opens up air channel along inward at both ends at the top of T-type, needs to guarantee
Two air channels are kept at a distance with central through hole；U-shaped air channel, the U-shaped air channel and two are opened up inside T-type lower cylinder
Air channel is connected, and constitutes vent line；
Sound source (11), lower coupler (1) and upper coupler (2) are fixedly connected sequentially；Two isolation liners (3) are symmetrically fixedly mounted
On coupler wall surface, it is respectively used to installation standard microphone (4) and heat plug main body (9)；Air inlet pipe (5) and escape pipe (8) are solid
Dingan County is mounted in heat plug main body (9) two sides；In the through-hole of probe insertion heat plug main body (9) of probe microphone (6), and pass through sealing
Material (7) is sealed and is fixed；
The calibration method of described device are as follows: open hot gas source, import thermal current in heat plug by air inlet pipe (5), and by escape pipe
(8) it exports, probe is heated, thermometric is carried out to the probe inside heat plug by the position of escape pipe (8) during heating；So
Afterwards, until temperature reaches desired temperature or more, it is transaudient to record real time temperature, standard according to vertification regulation sounding for control sound source (11)
Device (4) response is calibrated probe microphone (6) response；It after the measurement of all temperature gears, carries out position and exchanges, i.e., will
Standard microphone (4) be calibrated probe microphone (6) and mutually change to other side together with heat plug and be isolated in liner (3), repeat above
Step；After data record, hot gas source and sound source are closed；Finally according to the calculation formula of existing coupler comparison method, calculate
The sensitivity calibration result of probe microphone (6) is calibrated under different temperatures gear.
2. probe microphone high temperature calibrating installation as described in claim 1, it is characterised in that: the standard microphone (4)
Diameter is identical as the heat plug diameter of lower cylinder of main body (9).
3. probe microphone high temperature calibrating installation as described in claim 1, it is characterised in that: the top of the probe and heat are filled in
The bottom end of main body (9) flushes.
4. probe microphone high temperature calibrating installation as described in claim 1, it is characterised in that: the isolation liner (3) is symmetrical
It is fixedly mounted on coupler (2).
5. probe microphone high temperature calibrating installation as described in claim 1, it is characterised in that: the isolation liner (3) is symmetrical
It is fixedly mounted on lower coupler (1) side wall.
6. the probe microphone high temperature calibrating installation as described in claim 1 or 4 or 5, it is characterised in that: the isolation liner
(3) material need to be high temperature resistant and the lower material of thermal conductivity.
7. probe microphone high temperature calibrating installation as described in claim 1, it is characterised in that: the material of isolation liner (3)
Material is refractory ceramics or thermostability engineering plastic.
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110290454B (en) * | 2019-07-19 | 2020-10-16 | 中国计量科学研究院 | Microphone high-temperature calibration system based on optical method |
| CN113959559B (en) * | 2021-11-08 | 2024-09-10 | 陕西省计量科学研究院 | Acoustic level meter calibrating device revolving stage |
| CN114422927B (en) * | 2021-12-13 | 2024-05-24 | 中国航空工业集团公司北京长城计量测试技术研究所 | Microphone calibrating device of variable temperature |
| CN115623405A (en) * | 2022-09-06 | 2023-01-17 | 中国航空工业集团公司北京长城计量测试技术研究所 | Microphone calibrating device under vibration environment |
| CN119676628A (en) * | 2024-12-06 | 2025-03-21 | 中国航空工业集团公司北京长城计量测试技术研究所 | A microphone calibration device in a high temperature environment |
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