CN201246160Y - Inner graduation circuit of high-frequency electromagnetic wave well logging instrument - Google Patents
Inner graduation circuit of high-frequency electromagnetic wave well logging instrument Download PDFInfo
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- CN201246160Y CN201246160Y CNU2008201085492U CN200820108549U CN201246160Y CN 201246160 Y CN201246160 Y CN 201246160Y CN U2008201085492 U CNU2008201085492 U CN U2008201085492U CN 200820108549 U CN200820108549 U CN 200820108549U CN 201246160 Y CN201246160 Y CN 201246160Y
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- 238000005259 measurement Methods 0.000 claims description 28
- 238000012545 processing Methods 0.000 claims description 10
- 238000001914 filtration Methods 0.000 claims description 7
- 230000003750 conditioning effect Effects 0.000 claims description 4
- 238000013461 design Methods 0.000 abstract description 14
- 238000000034 method Methods 0.000 abstract description 4
- 238000007689 inspection Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
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- Y02A90/30—Assessment of water resources
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Abstract
The utility model discloses an inner calibration circuit of a high frequency electromagnetic wave logging instrument. One end thereof is respectively connected with a control module and a measure module, and the other end thereof is respectively connected with two channel circuits; the inner calibration circuit comprises an FPGA, two channels of digital-to-analog converting circuits, an interface circuit and a clock process logical circuit. The utility model can meet higher requirement for the design of the inner calibration circuit of the high frequency electromagnetic wave logging instrument, choose arbitrary phase difference and amplitude ratio calibration point within the measure range, and further complete the calibration of the whole circuit from signal reception to signal measure, thereby performing the function of the inner calibration truly.
Description
Technical field
The utility model relates to a kind of interior calibration circuit, specifically, relates to a kind of interior calibration circuit of frequency electromagnetic waves logger.
Background technology
Calibration circuit in the frequency electromagnetic waves logging instrument need design in instrument, whether the signal that is used for inspection apparatus receives with measuring circuit work normal.The interior calibration circuit of existing instrument all designs after the signal intermediate frequency conditioning, enter before the measuring circuit, and adopted the mode of fixed phase difference square wave, though such design is easy to realize, but calibration points is provided with less, be only applicable to the scale phase measuring circuit, more got around the scale inspection that high frequency is received and nurses one's health part.Therefore scale inspection in we need, especially when the frequency electromagnetic waves instrument of inspection high-precision phase measurement difference and amplitude ratio, the interior calibration circuit of prior art just can't be realized above-mentioned purpose.
As shown in Figure 3, be the scale signal path circuitry of prior art.Its scale signal passes through the mixing with local oscillation signal, the output intermediate-freuqncy signal is added to gating circuit with the received signal through channel circuit, behind the gating circuit decision scale signal end, the scale intermediate-freuqncy signal enters measuring circuit, carries out the measurement of correlation and the check of scale signal.As seen from Figure 3, in this channel circuit, the scale signal directly is added to the measuring circuit front end without channel circuit after mixing, its measurement result can not reflect the working condition of channel circuit, i.e. the working condition that the scale signal path circuitry of prior art can not the sense channel circuit.
Because above-mentioned content, prior art only design interior calibration circuit on intermediate-frequency circuit for the difficulty in the design, and adopt simple fixedly square wave mode, to cooperate follow-up digital phase demodulation design.Such design can't be satisfied the above-mentioned amplitude ratio and the design needs of the simultaneously-measured instrument of phase difference, because the latter can not adopt the design of simple numerical phase discriminator usually, and stricter for the designing requirement of high-frequency signal receiving circuit.Generally speaking, prior art adopts simple signal generation circuit to produce fixed skew, and two-way scale signal that can not the adjusting range ratio.
So the interior calibration circuit that those skilled in the art wish is can check to comprise that high-frequency signal receives and whole signals of processing section are handled and measuring circuit, and this just becomes problem demanding prompt solution in the prior art.
The utility model content
Technical problem to be solved in the utility model provides a kind of interior calibration circuit of frequency electromagnetic waves logger, does not have a kind of suitable interior calibration circuit inspection to comprise that high-frequency signal receives and problems such as whole signals processing of processing section and measurement in the prior art to solve.
In order to solve the problems of the technologies described above, the utility model provides a kind of interior calibration circuit of frequency electromagnetic waves logger, and wherein, an end of described interior calibration circuit links to each other with measurement module with control module respectively, and the other end links to each other with two channel circuits respectively; Calibration circuit is made up of on-site programmable gate array FPGA, two-way D/A converting circuit, interface circuit and clock occurrence logic circuit in described;
Wherein, described interface circuit one end links to each other with measurement module with described control module respectively, and the other end links to each other with described FPGA, receives the down order of this control module and transmits the control signal of FPGA to this measurement module; Described FPGA links to each other with described two-way D/A converting circuit, described two-way D/A converting circuit links to each other continuous with corresponding described channel circuit respectively, described clock occurrence logic circuit is connected with described FPGA, two described channel circuits all link to each other with described interface circuit, described FPGA is according to the clock signal of clock occurrence logic circuit, operation response is resolved and carried out to the down order of described control module, produce different frequency plots and amplitude control signal to described two-way D/A converting circuit, described two-way D/A converting circuit produces the different scale signal of two-way respectively; The different scale signal of described two-way all passes through corresponding described channel circuit and delivers to described measurement module by described interface circuit.
Calibration circuit in described in the utility model, wherein, described control module is a CPU.
Wherein, described measurement module is a digital signal processing unit.
Wherein, described channel circuit is connected to form successively by gating module, attenuation module, frequency mixing module and filtration module respectively.
Wherein, the different scale signal of described two-way all passes through corresponding described channel circuit and delivers to described measurement module by described interface circuit, further all in corresponding channel circuit, described channel circuit switch is controlled, and sent to measurement module by interface circuit by the gating module in this channel circuit, attenuation module, frequency mixing module, filtration module conditioning back through described FPGA generation passage gating and enable signal for the different scale signal of described two-way.
Technique effect of the present utility model is: the requirements at the higher level that can satisfy calibration circuit design in the frequency electromagnetic waves logging instrument, can in measurement category, select arbitrarily phase difference and amplitude than calibration points (both can also make up mutually), more can finish the scale that signal receives the entire circuit of measurement, the function of calibration circuit in real the realization.
Description of drawings
Fig. 1 is the structural principle block diagram of the interior calibration circuit of frequency electromagnetic waves logger described in the utility model;
Fig. 2 is that the two-way scale signal of the described interior calibration circuit generation of Fig. 1 is added to the overall structure block diagram on the channel circuit;
Fig. 3 is the structured flowchart of the scale signal path circuitry of prior art.
The specific embodiment
The utility model provides a kind of interior calibration circuit of frequency electromagnetic waves logger, does not have a kind of suitable interior calibration circuit inspection to comprise that high-frequency signal receives and problems such as whole signals processing of processing section and measurement in the prior art to solve.Below the specific embodiment is described in detail, but not as to qualification of the present utility model.
As shown in Figure 1, be the interior calibration circuit of frequency electromagnetic waves logger of the present utility model in the frame of broken lines.The synchronous Direct Digital frequency synthesizer circuit of two-way that the core of calibration circuit is made up of the logical design circuit and outside two-way digital-to-analogue (D/A) change-over circuit of FPGA (field programmable gate array) inside in being somebody's turn to do.
Wherein, one end of interior calibration circuit is that CPU (CPU) plate and measurement module are DSP (Digital Signal Processing with control module respectively, Digital Signal Processing) disposable plates links to each other, and the other end links to each other with two paths of signals passage (first passage and second channel) respectively; Should form by field programmable gate array circuit, two D/A converting circuits, interface circuit and clock occurrence logic circuit by interior calibration circuit;
Wherein, interface circuit one end links to each other with measurement module with control module respectively, and the other end is connected with field programmable gate array (FPGA); Two-way digital-to-analogue (D/A) change-over circuit is continuous with corresponding channel circuit (first passage or second channel) respectively, and two channel circuits all link to each other with interface circuit, and clock occurrence logic circuit is connected with field programmable gate array.
Here receive the down order of control module and transmit the control signal of FPGA by interface circuit measurement module; FPGA resolves and the execution operation response the down order of control module according to the clock signal of clock occurrence logic circuit, produces different frequency plots and amplitude control signal to two-way D/A change-over circuit, can produce the different scale signal of two-way respectively; Two paths of signals pass through all in corresponding channel circuit that FPGA produces the passage gating and enable signal removes to control the switch of respective channel circuit, and decays, delivers on the measurement module of outside by interface circuit behind mixing, filtering and the amplification modulate circuit.
After this, directly insert behind the scale signal process high s/n ratio attenuator circuit from signal high frequency receiving terminal, switch scale signal and sensor signal by switch, the scale inspection covered and receives the whole signal processing circuit of measuring circuit from high-frequency signal in such design can make; And prior art scale signal is inserted by the measuring circuit front end, can't check the circuit performance of high-frequency signal conditioning part.
As shown in Figure 2, this is to be added to entire block diagram on the channel circuit by the two-way scale signal that produces among Fig. 1.The channel circuit is here connected to form successively by gating module, attenuation module, frequency mixing module and filtration module respectively.The scale signal is added in channel circuit (A or B) front end, when input that gating scale signal is inserted, the scale signal enters measuring circuit by decay and mixting circuit output intermediate-freuqncy signal after this intermediate-freuqncy signal filtering, carries out the measurement of correlation and the inspection of scale signal.Because the scale signal is added to the leading portion of channel circuit,, can check the working condition of channel circuit therefore by can reflect the working condition of whole passage to the measurement of scale signal.
Compared with prior art, effect of the present utility model is:
1, adopts modularization high-precision signal generator and FPGA direct digital frequency synthesis technology, produce the two-way scale signal that can change phase difference and amplitude ratio in the measurement category arbitrarily by sine table control;
2, directly insert behind the scale signal process high s/n ratio attenuator circuit from signal high frequency receiving terminal, switch scale signal and sensor signal by switch, such design can make the scale inspection cover from high-frequency signal and receive the circuit that the whole signal of measuring circuit is handled.
Certainly; the utility model also can have other various embodiments; under the situation that does not deviate from the utility model spirit and essence thereof; those of ordinary skill in the art can make various corresponding changes and distortion according to the utility model, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the utility model.
Claims (5)
1, a kind of interior calibration circuit of frequency electromagnetic waves logger is characterized in that, an end of described interior calibration circuit links to each other with measurement module with control module respectively, and the other end links to each other with two channel circuits respectively; Calibration circuit is made up of on-site programmable gate array FPGA, two-way D/A converting circuit, interface circuit and clock occurrence logic circuit in described;
Wherein, described interface circuit one end links to each other with measurement module with described control module respectively, and the other end links to each other with described FPGA, receives the down order of this control module and transmits the control signal of FPGA to this measurement module; Described FPGA links to each other with described two-way D/A converting circuit, described two-way D/A converting circuit links to each other continuous with corresponding described channel circuit respectively, described clock occurrence logic circuit is connected with described FPGA, two described channel circuits all link to each other with described interface circuit, described FPGA is according to the clock signal of clock occurrence logic circuit, operation response is resolved and carried out to the down order of described control module, produce different frequency plots and amplitude control signal to described two-way D/A converting circuit, described two-way D/A converting circuit produces the different scale signal of two-way respectively; The different scale signal of described two-way all passes through corresponding described channel circuit and delivers to described measurement module by described interface circuit.
2, interior calibration circuit as claimed in claim 1 is characterized in that described control module is a CPU.
3, interior calibration circuit as claimed in claim 1 is characterized in that described measurement module is a digital signal processing unit.
4, interior calibration circuit as claimed in claim 1 is characterized in that described channel circuit is connected to form successively by gating module, attenuation module, frequency mixing module and filtration module respectively.
5, interior calibration circuit as claimed in claim 4, it is characterized in that, the different scale signal of described two-way all passes through corresponding described channel circuit and delivers to described measurement module by described interface circuit, further all in corresponding channel circuit, described channel circuit switch is controlled, and sent to measurement module by interface circuit by the gating module in this channel circuit, attenuation module, frequency mixing module, filtration module conditioning back through described FPGA generation passage gating and enable signal for the different scale signal of described two-way.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201085492U CN201246160Y (en) | 2008-06-13 | 2008-06-13 | Inner graduation circuit of high-frequency electromagnetic wave well logging instrument |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201085492U CN201246160Y (en) | 2008-06-13 | 2008-06-13 | Inner graduation circuit of high-frequency electromagnetic wave well logging instrument |
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| CN201246160Y true CN201246160Y (en) | 2009-05-27 |
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| CNU2008201085492U Expired - Fee Related CN201246160Y (en) | 2008-06-13 | 2008-06-13 | Inner graduation circuit of high-frequency electromagnetic wave well logging instrument |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102628358A (en) * | 2010-12-23 | 2012-08-08 | 中国石油化工股份有限公司 | Well logging method |
-
2008
- 2008-06-13 CN CNU2008201085492U patent/CN201246160Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102628358A (en) * | 2010-12-23 | 2012-08-08 | 中国石油化工股份有限公司 | Well logging method |
| CN102628358B (en) * | 2010-12-23 | 2015-01-07 | 中国石油化工股份有限公司 | Well logging method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090527 Termination date: 20160613 |
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| CF01 | Termination of patent right due to non-payment of annual fee |