CN214224342U - Device for testing micro-vibration of low-temperature cold head of refrigerating machine - Google Patents
Device for testing micro-vibration of low-temperature cold head of refrigerating machine Download PDFInfo
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- CN214224342U CN214224342U CN202120144376.5U CN202120144376U CN214224342U CN 214224342 U CN214224342 U CN 214224342U CN 202120144376 U CN202120144376 U CN 202120144376U CN 214224342 U CN214224342 U CN 214224342U
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- 238000012360 testing method Methods 0.000 title claims abstract description 38
- 238000006073 displacement reaction Methods 0.000 claims abstract description 9
- 230000008878 coupling Effects 0.000 claims abstract description 6
- 238000010168 coupling process Methods 0.000 claims abstract description 6
- 238000005859 coupling reaction Methods 0.000 claims abstract description 6
- 230000003287 optical effect Effects 0.000 claims description 23
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 21
- 229910052710 silicon Inorganic materials 0.000 claims description 21
- 239000010703 silicon Substances 0.000 claims description 21
- 238000002955 isolation Methods 0.000 claims description 9
- 239000000725 suspension Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 3
- 239000004519 grease Substances 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 230000004044 response Effects 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 238000010998 test method Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 5
- 230000001133 acceleration Effects 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000003331 infrared imaging Methods 0.000 description 1
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Abstract
The utility model provides a device for testing refrigerator low temperature cold head micro-vibration, incide laser beam on the four-quadrant detector to gather laser intensity on four pixels and carry out the skew of difference and operation and reachs the reverse release refrigerator during operation low temperature cold head displacement skew of laser center, test its micro-vibration, the problem of refrigerator low temperature cold head (40K-120K) micro-vibration test can be solved to this test method, meanwhile can directly test the micro-displacement of detector behind infrared detector dewar and the coupling of low temperature cold head.
Description
Technical Field
The utility model relates to a low temperature cold head technical field, in particular to a device for testing refrigerator low temperature cold head micro-vibration.
Background
The infrared imaging and hyperspectral camera consists of an optical sensor, an infrared detector, a refrigerator and an acquisition circuit, wherein the infrared detector is coupled with a low-temperature cold head of the refrigerator, the low-temperature cold head of the refrigerator provides a low-temperature (40K-120K) environment for the infrared detector, and the dark current of the infrared detector is reduced so that the infrared detector can normally work. The refrigerator generally comprises a compressor and a cold head, wherein the low-temperature cold head is the key part which has the lowest cold head temperature and is coupled with the infrared detector. The small vibrations of the cryocooler caused by compressor pressure waves or moving parts of the cold head itself are inherent characteristics of the refrigerator. If the low-temperature cold head transmits micro-vibration exceeding a certain range to the infrared detector, imaging blurring and spectral resolution reduction of the infrared camera are caused. The high requirements of high-precision infrared cameras, particularly satellite-borne infrared detectors on imaging and spectral resolution put forward the goal of reducing the micro-vibration of the low-temperature cold head of the refrigerating machine as much as possible, and a high-precision reliable method for testing the micro-vibration of the low-temperature cold head to evaluate the micro-vibration level is urgently needed.
At present, normal temperature components of the refrigerator are tested by force and acceleration sensors, and the low-temperature cold head cannot be tested by adopting the above mode due to inherent characteristics. Firstly, a force sensor needs to be rigidly connected with a measured object, and the micro-vibration power of the measured object is tested through a counterforce; the low-temperature cold head is in a thin-wall cylindrical shape, the thickness of the low-temperature cold head is only 3-10mm, no mounting hole is formed, the low-temperature cold head cannot be rigidly connected with a force sensor, and the micro-vibration of the low-temperature cold head cannot be tested through counter force. Secondly, no matter the working temperature area of the piezoelectric type, piezoresistive type or coil type acceleration sensor is-50-85 ℃, the temperature of the low-temperature cold head is 40-120K (namely-233-153 ℃), and the acceleration sensor cannot work at the temperature or the test result is inaccurate.
SUMMERY OF THE UTILITY MODEL
Therefore, it is necessary to provide a highly accurate and reliable apparatus for testing micro-vibration of a cryocooler to evaluate the micro-vibration level of the cryocooler.
In order to solve the above problems, the utility model adopts the following technical proposal:
an apparatus for testing micro-vibration of a cryocooler, comprising: the system comprises a refrigerator compressor (1), a refrigerator low-temperature cold head (2), a four-quadrant detector Dewar (3), a four-quadrant detector (4), a diaphragm (5), a collimator (6), a collimation laser (7), a three-dimensional precision optical adjusting frame (8), a preamplifier (9), a signal processing module (10), a suspension frame (11), an optical vibration isolation platform (12) and a refrigerator controller (13); wherein: the refrigerator compressor (1) and the refrigerator low-temperature cold head (2) are fixedly connected to form a refrigerator together, the refrigerator controller (13) controls the refrigerator to work, the four-quadrant detector (4) is arranged in the four-quadrant detector Dewar (3), the four-quadrant detector Dewar (3) is coupled with the low-temperature cold head (2) of the refrigerator and keeps vacuum, when in micro-vibration test, the refrigerator compressor (1) and the refrigerator low-temperature cold head (2) are respectively suspended on the suspension bracket (11) to be in a free state, the diaphragm (5), the collimator (6) and the three-dimensional precise optical adjusting frame (8) are fixed on the optical vibration isolation platform (12), the collimation laser (7) is arranged behind the three-dimensional precise optical adjusting frame (8) and is placed at the focus position of the collimator tube (6);
the collimating laser (7) emits laser light, the laser light is converted into parallel light through the collimator tube (6), the parallel light passes through the diaphragm (5) and is shaped into a circular laser spot (15), the circular laser spot (15) penetrates through a window of the four-quadrant detector Dewar (3) and irradiates the four-quadrant detector (4), and the four-quadrant detector (4) detects a laser signal, amplifies the signal through the preamplifier (9) and then transmits the amplified signal to the signal processing module (10) for signal analysis processing.
In some embodiments, the refrigerator compressor (1) and the refrigerator low-temperature cold head (2) are fixedly connected through a welding process.
In some of these embodiments, the four-quadrant detector dewar (3) includes a first vacuum portion coupled to the four-quadrant detector (4) and a second vacuum portion plug-coupled to the refrigerator cryocooler (2).
In some embodiments, the four-quadrant detector (4) is bonded in the four-quadrant detector Dewar (3) through a low-temperature adhesive, and a heat conduction grease is filled between the coupling surfaces of the four-quadrant detector Dewar (3) and the refrigerator low-temperature cold head (2).
In some embodiments, the refrigerator further comprises a spring (14), and the refrigerator compressor 1 and the refrigerator low-temperature cold head 2 are hung on the suspension bracket (11) through the spring (14) respectively to enable the refrigerator to be in a free state.
In some embodiments, the diaphragm (5), the collimator (6) and the three-dimensional precise optical adjusting frame (8) are fixed on the optical vibration isolation platform (12) through screws.
In some of the embodiments, the four-quadrant detector (4) is a silicon four-quadrant detector, and the four-quadrant detector is divided into 4 right-angle fan-shaped silicon-based photodetectors with equal areas, same shapes and symmetrical positions.
In some of these embodiments, the response wavelength of the right-angle fan-shaped silicon-based photodetector is 400nm to 1100nm, the diameter is 4mm, and the cross gap is 20 μm.
In some embodiments, the four quadrants of the silicon four-quadrant detector are respectively represented by A, B, C, D, any one of the right-angle fan-shaped silicon-based photodetectors is independent from each other and is respectively located in the above 4 quadrants, each of the right-angle fan-shaped silicon-based photodetectors represents one quadrant, the right-angle fan-shaped silicon-based photodetectors can receive a certain amount of light energy and output a certain amount of photovoltage, the output voltage is proportional to the light power received by the detector, the corresponding output signals are VA, VB, VC and VD, the circular laser spot (15) is divided into 4 parts by 4 quadrants, the corresponding output signals are electrical signals with different amplitudes, and the displacement change signals in two directions are VX, VY:
adopt above-mentioned technical scheme, the utility model discloses the technological effect who realizes as follows:
the utility model provides a device for testing refrigerator low temperature cold head micro-vibration, incide laser beam on the four-quadrant detector to gather laser intensity on four pixels and carry out the skew of difference and operation and reachs the reverse release refrigerator during operation low temperature cold head displacement skew of laser center, test its micro-vibration, the problem of refrigerator low temperature cold head (40K-120K) micro-vibration test can be solved to this test method, meanwhile can directly test the micro-displacement of detector behind infrared detector dewar and the coupling of low temperature cold head.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention or the description of the prior art will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an apparatus for testing micro-vibration of a cryocooler according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a refrigerator for testing a micro-vibration device of a low-temperature cold head of the refrigerator according to an embodiment of the present invention.
Fig. 3 is a schematic view of a testing principle for testing a low-temperature cold head micro-vibration device of a refrigerator according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.
Please refer to fig. 1, which is a schematic structural diagram of an apparatus for testing micro-vibration of a low-temperature cold head of a refrigerator according to an embodiment of the present invention, including: the device comprises a refrigerator compressor (1), a refrigerator low-temperature cold head (2), a four-quadrant detector Dewar (3), a four-quadrant detector (4), a diaphragm (5), a collimator (6), a collimation laser (7), a three-dimensional precision optical adjusting frame (8), a preamplifier (9), a signal processing module (10), a suspension frame (11), an optical vibration isolation platform (12) and a refrigerator controller (13). The connection between the above components is described in detail below.
The refrigerator compressor (1) and the refrigerator low-temperature cold head (2) are fixedly connected to form a refrigerator together, and the refrigerator controller (13) controls the refrigerator to work. Specifically, the refrigerator compressor (1) and the refrigerator low-temperature cold head (2) are fixedly connected through a welding process.
The four-quadrant detector (4) is arranged in the four-quadrant detector Dewar (3), and the four-quadrant detector Dewar (3) is coupled with the low-temperature cold head (2) of the refrigerator and keeps vacuum. Specifically, the four-quadrant detector Dewar (3) comprises a first vacuum part coupled with the four-quadrant detector (4) and a second vacuum part plug-coupled with the refrigerator low-temperature cold head (2).
Furthermore, the four-quadrant detector (4) is bonded in the four-quadrant detector Dewar (3) through a low-temperature adhesive, and heat conduction grease is filled between the coupling surfaces of the four-quadrant detector Dewar (3) and the low-temperature cold head (2) of the refrigerator.
Please refer to fig. 2, which is a schematic structural diagram of the four-quadrant detector (4) according to an embodiment of the present invention, the four-quadrant detector (4) is a silicon four-quadrant detector, and the four-quadrant detector is divided into 4 right-angle fan-shaped silicon-based photodetectors having equal areas, the same shapes, and symmetrical positions.
In some of these embodiments, the response wavelength of the right-angle fan-shaped silicon-based photodetector is 400nm to 1100nm, the diameter is 4mm, and the cross gap is 20 μm.
The refrigerator compressor (1) and the refrigerator low-temperature cold head (2) are respectively suspended on the suspension frame (11) and are in a free state. Specifically, the refrigerator compressor 1 and the refrigerator low-temperature cold head 2 are respectively hung on the suspension bracket (11) through the spring (14) to enable the refrigerator to be in a free state.
The diaphragm (5), the collimator (6) and the three-dimensional precise optical adjusting frame (8) are fixed on the optical vibration isolation platform (12). Specifically, the diaphragm (5), the collimator (6) and the three-dimensional precise optical adjusting frame (8) are fixed on the optical vibration isolation platform (12) through screws.
The collimation laser (7) is arranged behind the three-dimensional precise optical adjusting frame (8) and is placed at the focus position of the collimator tube (6).
The working mode of the device for testing the micro-vibration of the low-temperature cold head of the refrigerating machine is as follows:
the collimating laser (7) emits laser light, the laser light is converted into parallel light through the collimator tube (6), the parallel light passes through the diaphragm (5) and is shaped into a circular laser spot (15), the circular laser spot (15) penetrates through a window of the four-quadrant detector Dewar (3) and irradiates the four-quadrant detector (4), and the four-quadrant detector (4) detects a laser signal, amplifies the signal through the preamplifier (9) and then transmits the amplified signal to the signal processing module (10) for signal analysis processing.
Furthermore, the diameter of a laser beam emitted by the collimation laser (7) is 2mm, and is half of the diameter of the four-quadrant detector.
It can be understood that the circular laser spot 15 irradiates on the photosensitive surface of the four-quadrant detector 4 through the window of the four-quadrant detector dewar 3, the laser spot is divided into 4 parts by four quadrants, electric signals with different amplitudes are correspondingly output, and the offset size and the offset direction of a target relative to an optical axis are measured by using a sum-difference circuit.
Please refer to fig. 3, which is a schematic diagram illustrating a testing principle for testing a micro-vibration device of a low-temperature cold head of a refrigerator according to an embodiment of the present invention.
Furthermore, 4 quadrants of the silicon four-quadrant detector are respectively represented by A, B, C, D, any one right-angle sector-shaped silicon-based photodetector is independent from each other and is respectively located in the above 4 quadrants, each right-angle sector-shaped silicon-based photodetector represents one quadrant, the right-angle sector-shaped silicon-based photodetector can receive certain light energy and output certain photovoltage, the output voltage is proportional to the light power received by the detector, the corresponding output signals are VA, VB, VC and VD, a circular laser spot (15) penetrates through a window of the four-quadrant detector dewar (3) and irradiates a light spot on a photosensitive surface of the four-quadrant detector (4) to be divided into 4 parts by 4 quadrants, electric signals with different amplitudes are correspondingly output, and displacement change signals in two directions are VX and VY:
the utility model provides a device for testing refrigerator low temperature cold head micro-vibration, incide laser beam on the four-quadrant detector to gather laser intensity on four pixels and carry out the skew of difference and operation and reachs the reverse release refrigerator during operation low temperature cold head displacement skew of laser center, test its micro-vibration, the problem of refrigerator low temperature cold head (40K-120K) micro-vibration test can be solved to this test method, meanwhile can directly test the micro-displacement of detector behind infrared detector dewar and the coupling of low temperature cold head.
The foregoing is only a preferred embodiment of the present invention, and the technical principles of the present invention have been specifically described, and the description is only for the purpose of explaining the principles of the present invention, and should not be construed as limiting the scope of the present invention in any way. Any modifications, equivalents and improvements made within the spirit and principles of the invention and other embodiments of the invention without the creative effort of those skilled in the art are intended to be included within the protection scope of the invention.
Claims (9)
1. An apparatus for testing micro-vibration of a cryocooler cold head of a refrigerator, comprising: the system comprises a refrigerator compressor (1), a refrigerator low-temperature cold head (2), a four-quadrant detector Dewar (3), a four-quadrant detector (4), a diaphragm (5), a collimator (6), a collimation laser (7), a three-dimensional precision optical adjusting frame (8), a preamplifier (9), a signal processing module (10), a suspension frame (11), an optical vibration isolation platform (12) and a refrigerator controller (13); wherein:
the refrigerator compressor (1) and the refrigerator low-temperature cold head (2) are fixedly connected to form a refrigerator together, the refrigerator controller (13) controls the refrigerator to work, the four-quadrant detector (4) is arranged in the four-quadrant detector Dewar (3), the four-quadrant detector Dewar (3) is coupled with the low-temperature cold head (2) of the refrigerator and keeps vacuum, when in micro-vibration test, the refrigerator compressor (1) and the refrigerator low-temperature cold head (2) are respectively suspended on the suspension bracket (11) to be in a free state, the diaphragm (5), the collimator (6) and the three-dimensional precise optical adjusting frame (8) are fixed on the optical vibration isolation platform (12), the collimation laser (7) is arranged behind the three-dimensional precise optical adjusting frame (8) and is placed at the focus position of the collimator tube (6);
the collimating laser (7) emits laser light, the laser light is converted into parallel light through the collimator tube (6), the parallel light passes through the diaphragm (5) and is shaped into a circular laser spot (15), the circular laser spot (15) penetrates through a window of the four-quadrant detector Dewar (3) and irradiates the four-quadrant detector (4), and the four-quadrant detector (4) detects a laser signal, amplifies the signal through the preamplifier (9) and then transmits the amplified signal to the signal processing module (10) for signal analysis processing.
2. The device for testing the micro-vibration of the cryocooler head as claimed in claim 1, characterized in that the cryocooler compressor (1) and the cryocooler head (2) are fixedly connected by means of a welding process.
3. The apparatus for testing micro-vibrations of a refrigerator coldhead according to claim 1, wherein the four-quadrant detector dewar (3) comprises a first vacuum portion coupled to the four-quadrant detector (4) and a second vacuum portion insertedly coupled to the refrigerator coldhead (2).
4. The device for testing the micro-vibration of the cryocooler head according to claim 1, characterized in that the four-quadrant detector (4) is bonded in the four-quadrant detector dewar (3) by a cryocooler, and a thermal grease is filled between the coupling surfaces of the four-quadrant detector dewar (3) and the cryocooler head (2).
5. The device for testing the micro-vibration of the low-temperature cold head of the refrigerator as claimed in claim 1, further comprising a spring (14), wherein the refrigerator compressor (1) and the refrigerator low-temperature cold head (2) are respectively hung on the suspension bracket (11) through the spring (14) to enable the refrigerator to be in a free state.
6. The apparatus for testing micro-vibration of a cryocooler coldhead of a refrigerator according to claim 1, wherein the diaphragm (5), the collimator (6) and the three-dimensional precision optical adjustment bracket (8) are fixed to the optical vibration isolation platform (12) by screws.
7. The device for testing the micro-vibration of the low-temperature cold head of the refrigerating machine as claimed in claim 1, wherein the four-quadrant detector (4) is a silicon four-quadrant detector, and the four-quadrant detector is divided into 4 right-angle fan-shaped silicon-based photodetectors which are equal in area, same in shape and symmetrical in position.
8. The apparatus for testing micro-vibration of a cryocooler coldhead of a refrigerator according to claim 7, wherein the response wavelength of the right-angle fan-shaped silicon-based photodetector is 400nm to 1100nm, the diameter is 4mm, and the cross gap is 20 μm.
9. The apparatus for testing the micro-vibration of the cryocooler cold head of claim 7, wherein 4 quadrants of the silicon four-quadrant detector are respectively represented by A, B, C, D, any right-angle fan-shaped silicon-based photodetector is independent from each other and is respectively located in the above 4 quadrants, each of the right-angle fan-shaped silicon-based photodetectors represents one quadrant, the right-angle fan-shaped silicon-based photodetectors can receive a certain light energy and output a certain photovoltage, the magnitude of the photovoltage is proportional to the light power received by the detector, the corresponding output signals are VA, VB, VC and VD, the circular laser spot (15) irradiates the photosensitive surface of the four-quadrant detector (4) through the window of the four-quadrant detector dewar (3) and is divided into 4 parts by 4 quadrants, corresponding to output electrical signals with different magnitudes, and the displacement change signals in two directions are VX, VY:
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| CN202120144376.5U CN214224342U (en) | 2021-01-19 | 2021-01-19 | Device for testing micro-vibration of low-temperature cold head of refrigerating machine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114088188A (en) * | 2021-11-19 | 2022-02-25 | 中国计量科学研究院 | Vibration measuring system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114088188A (en) * | 2021-11-19 | 2022-02-25 | 中国计量科学研究院 | Vibration measuring system |
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