CN107314818A - One kind is directed to turbo blade infra-red radiation optical acquisition device - Google Patents

Abstract

The invention discloses an infrared radiation light collection device for turbine blades, belongs to the field of mechanical structures, and specifically designs a light focusing method. The infrared radiation on the surface of the turbine blade is collected by the reflector, collimated by the collimator, and finally collected by the receiver through the focusing mirror. The collimator is set on the collimation slider, and the collimation slider is set on the collimation rail. Rigid balls are used to realize the sliding connection between the collimation slider and the collimation guide rail, and the precise movement of the collimation slider is realized through the meshing of the gear and the rack. In order to make the moving distance of the collimation slider more accurate, the collimator Position detection points are set on the straight guide rail for position detection and correction of the collimation slider; thus, the present invention has the advantages of corresponding infrared radiation light collection of turbine blades and high focusing precision.

Description

A device for collecting infrared radiation from turbine blades

technical field

The invention belongs to the field of mechanical structures and specifically designs a focusing method for light.

Background technique

Compared with general temperature measurement technology, infrared temperature measurement technology does not need to be in contact with the measured object, will not destroy the temperature field of the measured object, has a fast response speed, and can measure the target temperature within a few milliseconds. °C temperature difference, the temperature measurement range is from -170 °C to over 3200 °C, easy to operate, safe and reliable, and can realize real-time observation and other advantages. Therefore, infrared temperature measurement is also widely used in industry, astronomy, meteorology, resource detection, scientific research, military and other fields by domestic and foreign enterprises.

The infrared temperature measurement system consists of two important modules, namely the infrared detection module and the optical module. The optical module converges the electromagnetic waves radiated from the surface of the measured object to the infrared detection module, and the infrared detection module converts the received energy into electrical signals. , after passing through the amplification circuit, compensation circuit and linear processing, the temperature of the measured object is displayed on the display terminal. The optical module of the traditional infrared temperature measurement system consists of a collimating mirror, and the optical radiation of the measured object is focused by the collimating mirror and modulated by the straightening disc before being irradiated onto the infrared detection module.

At present, my country's independent research and development of aero-engines is at a critical stage. Accurate measurement of turbine blade temperature is a technical bottleneck restricting the development of high-performance, high-thrust-to-weight ratio engines. Solving the problem of accurate measurement of engine turbine blade temperature has become a top priority. Using infrared temperature measurement technology, real-time and accurate monitoring of engine turbine blade temperature can be realized. When using infrared temperature measurement technology to monitor the temperature of turbine blades, in order to obtain the temperature information of the entire area of the turbine blades, it is necessary to measure point by point on different areas of the turbine blades. Therefore, it is necessary to use the optical probe to scan each point on the turbine blade point by point, and by changing the swing angle of the mirror, the collimator mirror can sequentially collect the heat radiation at different points on the turbine blade. In the process of point-by-point scanning of each point on the turbine blade with the optical probe, due to the structural characteristics of the turbine blade, points at different positions on the turbine blade have different object distances relative to the collimating mirror, so that the detector The image points above will be defocused, which will affect the measurement accuracy of radiation.

In the traditional infrared temperature measurement system, since the collimating lens is fixed, once the distance of the measured object changes, the infrared light radiated by the measured object will not be able to focus accurately on the infrared detection module, and the temperature measurement accuracy will be affected. big impact. Therefore, for the temperature measurement of the turbine blade surface of the turbine engine, it is urgent to study a variable-focus infrared temperature measurement optical module.

Contents of the invention

In order to overcome the problem that the focusing and collimating mirror cannot be adjusted in the existing infrared temperature measuring system, the present invention provides an adjustable focus infrared temperature measuring device applied to the temperature measurement of the surface of the turbine blade.

The technical solution of the present invention is an infrared radiation light collection device for turbine blades, which includes: a reflector and its base, a collimating mirror, a collimating guide rail, a collimating slider, a focusing mirror and its base, an infrared light receiving The mirror is used to reflect the infrared light radiated by the turbine blades into the temperature measurement optical path, and the mirror and the base can be flexibly connected so as to adjust the reflection angle of the mirror; the collimator is fixed on the collimator On the slider, the collimating slider is located on the collimating guide rail; the infrared light reflected by the reflector passes through the collimating mirror and the focusing mirror in turn and is collected by the infrared light receiver; it is characterized in that the collimating slider is aligned along the On the left and right sides of the sliding direction of the guide rail, one side is equipped with a power device and an engaging device with the collimating guide rail, and the other side is provided with a load-bearing device; The load-bearing is a rigid ball; the height of one side of the collimation guide rail used for the sliding of the rigid ball is lower than that of the other side.

Further, a plurality of position detection points are set on the collimation guide rail for position detection and correction of the collimation slider.

Further, the reflective mirror is made of quartz, the reflective surface is coated with metal platinum, and the diameter of the lens is 10mm; the collimator mirror is made of calcium fluoride material, and the diameter is 30mm; the material of the focusing mirror is Zinc selenide, the diameter is 30mm; the distance between the reflector and the turbine blade is 100mm when measuring.

The invention is an infrared radiation collection device for turbine blades. The infrared radiation light on the surface of the turbine blades is collected through a reflector, collimated by a collimating mirror, and finally collected by a receiver through a focusing mirror. On the slider, the collimation slider is set on the collimation guide rail, and the rigid ball is used to realize the sliding connection between the collimation slider and the collimation guide rail, and the precise movement of the collimation slider is realized through the meshing of the gear and the rack. In order to make the moving distance of the collimation slider more accurate, position detection points are set on the collimation guide rail for position detection and correction of the collimation slider; thus the present invention has the characteristics of turbine blade infrared radiation light collection and high focusing accuracy advantage.

Description of drawings

Figure 1 is a schematic diagram of the variable focus optical module of the turbine blade temperature measurement system.

FIG. 2 is an overall schematic diagram of a variable-focus infrared temperature measurement optical module.

Fig. 3 is a schematic diagram of the base of the collimating mirror guide rail and the moving slider of the collimating mirror.

Fig. 4 is a schematic diagram of the temperature measurement of the turbine blade by the variable-focus infrared temperature measurement system.

In the figure: 1. Reflector, 2. Measuring base, 3. Collimating mirror, 4. Collimating mirror rail base, 5. Collimating mirror moving slider, 6. Focusing mirror, 7. Infrared light receiver, 8. Position detection point, 9. Power unit.

detailed description

The present invention will be further introduced below in conjunction with the accompanying drawings and embodiments.

The reflector is made of quartz, the reflective surface is coated with metal platinum, and the diameter of the lens is 10mm. The deflection angle is adjusted by the main control center to reflect the infrared light radiated by the turbine blades into the temperature measurement optical path.

The measuring base is used for fixing the reflecting mirror and the infrared light detector.

The collimating mirror is made of calcium fluoride material and has a diameter of 30 mm. It is used to turn the infrared light reflected by the mirror into parallel light, and accurately focus the infrared light radiated by the turbine blades in the infrared detector. As shown in Figure 4, when the deflection angle of the reflector changes, the radiant energy radiated by points at different positions on the turbine blades is reflected into the optical path, because the points at different positions on the blades have different object distances relative to the collimating mirror , while the image distance in the present invention remains unchanged, in order to enable the radiation energy of the temperature measurement point corresponding to the deflection of the reflector to be focused into the infrared detector, the collimator needs to move a corresponding distance with the deflection of the reflector to ensure The object distance remains unchanged. In this embodiment, the length of the turbine blade is 100 mm, the distance between the reflector and the turbine blade is 100 mm, and the reflector is perpendicular to the top of the turbine blade tip. When the reflector deflects, the temperature measurement point moves from the turbine blade tip to the blade root, and the object distance changes by about 42 mm. , in order to keep the object distance constant, the collimating mirror needs to be moved to the left by 42mm, so that the radiation energy emitted by the temperature measurement point on the root of the turbine blade can be focused into the detector.

The collimating mirror guide rail base is used to fix the collimating mirror in the infrared light path and determine the moving direction of the collimating mirror.

The moving slider of the collimating mirror is used to drive the collimating mirror to move on the base of the collimating mirror rail to realize focusing. As shown in Figure 2, no intermediate medium is used between the moving slider of the collimator mirror and the base of the guide rail of the collimator mirror. When the moving slider moves, the steel ball rolls between the moving slider of the collimating mirror and the guide rail of the collimating mirror, and the wear amount of the guide rail and the slider is distributed to each steel ball, thereby prolonging the service life of the guide rail and the slider.

The focusing mirror is made of zinc selenide, has a diameter of 30mm and a focal length of 60mm, and is used to focus the parallel light passing through the collimating mirror into the infrared detector.

The infrared light detector is used to convert the infrared light radiated by the turbine blades into electrical signals.

Claims (3)

1. one kind is directed to turbo blade infra-red radiation optical acquisition device, the device includes：Speculum and its pedestal, collimating mirror, standard Straight guide, alignment slides, focus lamp and its pedestal, infrared light receiver, the speculum are used for give off turbo blade Infrared light reflection is movable between speculum and pedestal to connect to adjust the reflection angle of speculum into thermometric light path；Institute State collimating mirror to be fixed in alignment slides, alignment slides are located on collimation guide rail；The infrared light of the speculum reflection is successively By being gathered after collimating mirror, focus lamp by infrared light receiver；It is characterized in that the alignment slides edge collimation guide rail slip side To the left and right sides, side set power set and with collimate guide rail geared assembly, opposite side set load-bearing；The row engagement Device is the gear of power set in alignment slides, the rack on collimation guide rail；The load-bearing is rigid bead；The collimation is led The side that rail is used for rigid bead slip is highly less than opposite side.

2. it is as claimed in claim 1 a kind of for turbo blade infra-red radiation optical acquisition device, it is characterised in that the collimation Multiple position detection points are provided with guide rail, position detection and correction for alignment slides.

3. it is as claimed in claim 1 a kind of for turbo blade infra-red radiation optical acquisition device, it is characterised in that described is anti- Penetrate mirror to be made up of quartz, reflecting surface is coated with metal platinum, optic diameter is 10mm；Described collimating mirror is made up of calcium fluoride material, A diameter of 30mm；Described focus lamp material is zinc selenide, a diameter of 30mm；Speculum is with turbo blade distance during measurement 100mm。