CN213023203U - Detection and calibration device for laser Doppler velocimeter - Google Patents
Detection and calibration device for laser Doppler velocimeter Download PDFInfo
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- CN213023203U CN213023203U CN202021644983.XU CN202021644983U CN213023203U CN 213023203 U CN213023203 U CN 213023203U CN 202021644983 U CN202021644983 U CN 202021644983U CN 213023203 U CN213023203 U CN 213023203U
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Abstract
The utility model provides a laser Doppler velocimeter detects calibration device solves current calibration system and has that occupation space is big, the difficulty is transferred in the dress, detect the lower problem of precision. The device adopts servo motor to drive the turntable to rotate at high speed, can generate any movement speed under the laboratory condition, and can be used as a standard speed reference to detect and calibrate the laser Doppler velocimeter. The device comprises a servo motor, a supporting base, a transmission shaft, a rotary table, an expansion sleeve and a speed measuring device; the servo motor is arranged on the supporting base, and an output shaft of the servo motor is connected with the transmission shaft; the transmission shaft is arranged on the supporting base through a bearing assembly; the rotating disc is arranged on the transmission shaft through the expansion sleeve, the end face of the rotating disc is provided with a plurality of light reflecting plates and a plurality of weight balancing holes, the plurality of light reflecting plates are symmetrically arranged along the center of the rotating disc, and the light reflecting surfaces of the light reflecting plates are arranged along the radial direction of the rotating disc; the plurality of weight holes are uniformly distributed along the circumferential direction of the end surface of the rotary table; the speed measuring device is used for measuring the rotating speed of the output shaft of the servo motor.
Description
Technical Field
The utility model belongs to the detection and the demarcation field of laser doppler tachymeter, concretely relates to laser doppler tachymeter detects calibration device.
Background
The laser Doppler velocity measurement technology is a high-precision non-contact velocity measurement technology based on the optical Doppler effect, has the advantages of non-contact, electromagnetic interference resistance and the like, and is widely applied to various occasions. According to the linear motion rule, the speed and the displacement of the motion of the object are generated simultaneously, and the detection and calibration of the speed measurement precision of the laser Doppler velocimeter under the condition of constant detection distance can hardly be realized; in addition, in a laboratory environment, it is also very difficult to generate a certain movement velocity stably and repeatedly, so that it is very difficult to detect and calibrate technical indexes such as velocity measurement accuracy and detection distance of the laser doppler velocimeter.
Based on the above problems, chinese patent CN 110470863a discloses a calibration system and a calibration method for a speed measuring device, the system includes a speed regulating motor, a counter and a laser speed measuring device, a rotary table is disposed on an output shaft of the speed regulating motor, the rotary table rotates along with the output shaft, at least two extending portions are disposed in a radial direction of the rotary table, each extending portion is uniformly distributed in a circumferential direction of the rotary table, a light reflecting portion is disposed on at least one of the extending portions, a position of the laser speed measuring portion and a position of the rotary table are relatively fixed, light emitted from the laser speed measuring portion perpendicularly irradiates on the light reflecting portion, the counter detects a number of turns of the rotary table, a first tangential speed of the light reflecting portion is obtained by cooperation of the laser speed measuring portion and the light reflecting portion, a second tangential speed of the light reflecting portion is obtained by the counter, a comparison is made between the two tangential speeds, and obtaining a calibration coefficient of the first tangential velocity and the second tangential velocity, and realizing calibration of the free piston speed measuring device.
The calibration system can realize the calibration of the free piston speed measuring device, but the system has the following problems: firstly, at least two extending parts are arranged in the radial direction of the turntable, the extending parts not only increase the occupied space of a calibration system, but also increase the rotational inertia of the turntable, so that the adjustment difficulty of the balance of the turntable is greatly increased, the turntable is difficult to achieve better balance, the detection precision is low, and the assembly and adjustment are difficult; secondly, the system has large rotational inertia, so that acceleration always exists in the whole measuring process, the measuring speed is unstable, and the detection precision is reduced; and thirdly, the rotary table is directly connected with the motor rotating shaft through keys, and the rotary table is rotated and jumped due to unstable torque transmission because of the gap existing in key matching, so that the detection precision is finally lower.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the problem that the existing calibration system has large occupation space, difficult debugging and lower detection precision, and providing a laser Doppler velocimeter detection calibration device. The device adopts servo motor to drive the turntable to rotate at high speed, can generate any movement speed under the laboratory condition, and can be used as a standard speed reference to detect and calibrate the laser Doppler velocimeter.
For realizing the purpose of the above utility model, the technical scheme of the utility model is that:
a detection calibration device of a laser Doppler velocimeter comprises a servo motor, a supporting base, a transmission shaft, a rotary table, an expansion sleeve and a velocimeter; the servo motor is arranged on the supporting base, and an output shaft of the servo motor is connected with the transmission shaft; the transmission shaft is arranged on the supporting base through a bearing assembly; the rotary table is of a disc structure and is mounted on the transmission shaft through the expansion sleeve, the end face of the rotary table is provided with a plurality of light reflecting plates and a plurality of weight holes, the plurality of light reflecting plates are arranged along the circumferential direction of the rotary table, and the light reflecting surfaces of the light reflecting plates reflect laser emitted by the laser Doppler velocimeter back to the laser Doppler velocimeter; the plurality of counterweight holes are uniformly distributed along the circumferential direction of the end surface of the rotary table and used for mounting counterweight blocks; the speed measuring device is arranged on the supporting base and used for measuring the rotating speed of the output shaft of the servo motor.
Further, the bearing assembly comprises a bearing seat, a bearing gland, a locking nut, a first deep groove ball bearing and a second deep groove ball bearing; the bearing block is fixedly arranged on the supporting base, the first deep groove ball bearing and the second deep groove ball bearing are sleeved on the transmission shaft and are respectively arranged on two sides of a shaft hole of the bearing block, one end of the first deep groove ball bearing is limited through a bearing gland and a step arranged on the transmission shaft, and the other end of the first deep groove ball bearing is limited through a step arranged in the shaft hole of the bearing block; one end of the second deep groove ball bearing is limited through a step arranged in a shaft hole of the bearing seat, and the other end of the second deep groove ball bearing is limited through a locking nut sleeved on the transmission shaft.
Further, servo motor passes through the motor fixing base and installs on supporting the base, the motor fixing base is L shape structure, including base plate and curb plate, the base plate is fixed to be set up on supporting the base, servo motor is fixed to be set up on the curb plate.
Furthermore, the top of supporting the base is provided with the constant head tank, the base plate passes through the constant head tank setting on supporting the base.
Further, the counterweight hole is a threaded hole, and the counterweight block is a counterweight bolt.
Furthermore, the end face of the rotary table is provided with a plurality of lightening holes for lightening the weight of the rotary table.
Further, the center of carousel is provided with the installation boss, the carousel passes through the installation boss, expands the cover and installs on the transmission shaft.
Further, the speed measuring device is specifically a motor rotating speed measuring instrument or an encoder.
Further, the side of the reflector is provided with a reflective strip or coated with reflective paint, so as to form a reflective surface.
Further, an output shaft of the servo motor is connected with the transmission shaft through a coupler.
Compared with the prior art, the utility model discloses technical scheme's beneficial effect does:
1. the utility model provides an among the laser Doppler velocimeter detection calibration device, directly set up the reflector panel on the carousel, the carousel adopts circular symmetrical structure, simultaneously, is provided with a plurality of counter weight holes and balancing weight in the circumference of carousel for the inertia of carousel is extremely low, and dynamic balance is good, and the rotational speed undulates and hangs down, and speed uniformity is higher, can stabilize, the arbitrary velocity of motion of repeated generation, has higher detection precision.
2. The utility model discloses laser Doppler velocimeter detects calibration device can realize the independent detection and the demarcation of speed measurement precision and detection distance, and the velocity of motion changes through adjustment servo motor rotational speed, and detection distance changes through the distance between adjustment laser Doppler velocimeter and the calibration device, and mutual independence between the two does not influence each other.
3. The utility model discloses among the laser Doppler velocimeter detection calibration device, through setting up the speed sensor on the servo motor output shaft, acquire standard speed through this speed sensor, therefore standard speed is decided by the servo motor rotational speed, and has ripe trade detection standard and detecting instrument to the servo motor rotational speed at present, consequently traces to the source nature good to the measurement of the precision of testing the speed for standard speed precision is higher, and then makes the precision of demarcation higher.
4. The utility model discloses among the laser Doppler velocimeter detection calibration device, detection distance is surveyed by length measuring equipment such as meter chi, laser range finder, and length measuring equipment such as meter chi, laser range finder has ripe trade detection standard and detecting instrument at present, consequently traces to the source nature good to detection distance's measurement.
5. The utility model discloses in the laser Doppler velocimeter detected calibration device working process, it is great to rotate maximum speed, therefore preferred deep groove ball bearing uses the duplex bearing to make the carousel rotate stably, guarantees the stability that the laser Doppler velocimeter tested the speed.
6. The utility model discloses among the laser Doppler velocimeter detection calibration device, the carousel is installed on the transmission shaft through the cover that expands, and the centering nature that the key-type connection was compared to the cover that expands is better, and loading and unloading are convenient, and the stress concentration that arouses is less, and bearing capacity is high to there is the safety protection effect, can guarantee the axiality of carousel and transmission shaft, beat when making the rotation minimum.
7. The utility model discloses among the laser Doppler velocimeter detection calibration device, the rotation motor adopts servo motor, and servo motor control accuracy is high, and rotational speed stability is good.
Drawings
Fig. 1 is a calibration schematic diagram of the detection calibration device of the laser doppler velocimeter of the present invention;
fig. 2 is a schematic structural view of the detection calibration device of the laser doppler velocimeter of the present invention;
fig. 3 is a schematic structural diagram of the bearing assembly of the present invention;
fig. 4 is a schematic structural view of the motor fixing seat of the present invention;
FIG. 5 is a front view of the rotary plate and the expansion sleeve of the present invention;
fig. 6 is a sectional view a-a of fig. 5.
Reference numerals: 1-servo motor, 2-motor fixing seat, 3-supporting base, 5-bearing assembly, 6-expansion sleeve, 7-rotary table, 8-reflector plate, 9-transmission shaft, 10-coupler, 11-laser Doppler velocimeter, 21-base plate, 22-side plate, 31-positioning groove, 501-bearing seat, 502-bearing gland, 503-first deep groove ball bearing, 504-second deep groove ball bearing, 505-locking nut, 71-counterweight hole, 72-lightening hole, 73-mounting boss and 81-reflecting surface.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The utility model provides a laser Doppler velocimeter detects calibration device can realize the detection and the demarcation to technical index such as the accuracy of testing the speed of laser Doppler velocimeter, detection range. When the calibration is detected, the servo motor drives the rotary table to move at a high speed, the two reflectors are fixed at the edge of the rotary table, when the reflecting surface of each reflector is perpendicular to the laser irradiation direction of the laser Doppler velocimeter, the linear speed of the movement at the moment is taken as the standard speed, the speed measurement precision of the laser Doppler velocimeter is detected and calibrated, any speed is generated by changing the rotating speed of the servo motor, and the distance between the reflecting surface and the laser Doppler velocimeter is changed, so that the detection and calibration of the detection distance of the laser Doppler velocimeter are realized.
As shown in fig. 2, the utility model discloses laser doppler velocimeter detects calibration device includes servo motor 1, supports base 3, carousel 7, transmission shaft 9, bloated cover 6 and speed sensor. The servo motor 1 is arranged on the supporting base 3, and an output shaft of the servo motor is connected with the transmission shaft 9 through a coupler 10. The transmission shaft 9 is arranged on the supporting base 3 through the bearing assembly 5, the right end of the transmission shaft is provided with a key groove, the connection with the coupler 10 through a semicircular key is facilitated, and the left end of the transmission shaft is an optical axis and is convenient to connect with the expansion sleeve 6. Carousel 7 is the disc structure, installs on transmission shaft 9 through expanding cover 6, is provided with a plurality of reflectors 8 on its terminal surface, and a plurality of reflectors 8 use 7 geometric centre of carousel as the centre of a circle, are central symmetric distribution, and quantity is confirmed according to the actual test demand, and preferred quantity is 2, and the side of reflector 8 is provided with the reflection of light strip or the coating has the reflecting paint to form reflection of light face 81, reflection of light face 81 with the laser reflection of laser doppler velocimeter transmission back laser doppler velocimeter. The speed measuring device is used for detecting the rotating speed of the output shaft of the servo motor, can adopt the existing relatively accurate speed measuring device, for example, a motor rotating speed measuring instrument, an encoder or a Hall sensor and the like, can be specifically arranged on the supporting base 3, can also be arranged on other devices, is not limited in the installation mode, and can be used as long as the rotating speed measurement of the servo motor is realized. When the turntable 7 rotates at a high speed, if and only if the laser irradiation direction of the laser doppler velocimeter is perpendicular to the reflecting surface 81, the laser doppler velocimeter can receive an echo signal, the rotating linear speed of the turntable 7 at the moment can be calculated, different moving speeds can be simulated by adjusting the rotating speed of the servo motor 1, and the detection and calibration of the laser doppler velocimeter speed measurement precision and the detection distance can be realized by adjusting the relative distance between the reflecting surface 81 and the laser doppler velocimeter.
As shown in fig. 3, in the detection calibration device of the laser doppler velocimeter of the present invention, the bearing assembly 5 specifically includes a bearing seat 501, a bearing gland 502, a lock nut 505, a first deep groove ball bearing 503 and a second deep groove ball bearing 504; a bearing seat 501 is fixedly arranged on the supporting base 3, a first deep groove ball bearing 503 and a second deep groove ball bearing 504 are sleeved on the transmission shaft 9 and are respectively arranged in shaft holes on the left side and the right side of the bearing seat 501, one end of the first deep groove ball bearing 503 is limited by a bearing gland 502 and a step arranged on the transmission shaft 9, and the other end of the first deep groove ball bearing is limited by a step arranged in the shaft hole of the bearing seat 501; one end of the second deep groove ball bearing 504 is limited by a step arranged in a shaft hole of the bearing seat 501, the other end of the second deep groove ball bearing is limited by a locking nut 505 sleeved on the transmission shaft 9, and the bearing achieves an ideal clearance through the adjustment and matching of the bearing gland 502 and the locking nut 505. The utility model discloses in the calibration device working process, it is great to rotate maximum speed, therefore preferred deep groove ball bearing uses duplex bearing to make 7 rotational stabilities of carousel, guarantees the stability that laser Doppler velocimeter tested the speed.
The utility model discloses among the laser Doppler velocimeter detection calibration device, be provided with a plurality of weight ports 71 on the terminal surface of carousel 7, a plurality of weight ports 71 are along the terminal surface circumference equipartition of carousel 7 for install the balancing weight, at this moment, this weight port 71 can be the screw hole, and the balancing weight can be the counter weight bolt, and dynamic balance when whole device rotates is adjusted to the mode of the fixed counter weight bolt of accessible realizes the quick convenient adjustment to carousel 7 inertia.
The utility model discloses among the laser Doppler velocimeter detection calibration device, carousel 7 is installed on transmission shaft 9 through expanding cover 6, and expanding cover 6 compares with the key-type connection, and its centering nature is better, and loading and unloading are convenient, and the stress concentration that arouses is less, and bearing capacity is high to there is the safety protection effect, can guarantee carousel 7 and transmission shaft 9's axiality, beat when making the rotation minimum.
The utility model discloses among the laser Doppler velocimeter detection calibration device, 1 concrete accessible motor fixing base 2 of servo motor is installed on supporting base 3 through constant head tank 31, as shown in fig. 4, motor fixing base 2 specifically can be L shape structure, including base plate 21 and curb plate 22, base plate 21 is fixed to be set up on supporting base 3, and servo motor 1 passes through the fix with screw setting on curb plate 22. Meanwhile, as shown in fig. 5 and 6, the end surface of the turntable 7 is provided with a plurality of lightening holes 72 for lightening the weight of the turntable 7. The center of the rotary table 7 is provided with a mounting boss 73, and the rotary table 7 is mounted on the transmission shaft 9 through the mounting boss 73 and the expansion sleeve 6. When the screw on the expansion sleeve 6 is screwed, under the action of axial force, the inner sleeve and the outer sleeve of the expansion sleeve 6 are wedged tightly, the inner sleeve is shrunk to hoop the transmission shaft 9, and the outer sleeve is expanded to brace the hub of the rotary table 7, so that the purpose of transmitting torque is achieved.
As shown in FIG. 1, when the servo motor 1 finishes preheating and the rotating speed is stable, the temperature of the servo motor 1 is adjustedUnder the drive, the rotary table 7 starts to rotate at a high speed to perform uniform circular motion, and if and only if the reflecting surface 81 just moves to be perpendicular to the laser irradiation direction of the laser doppler velocimeter 11, the linear velocity direction of the movement of the reflecting surface 81 is parallel to the laser irradiation direction of the laser doppler velocimeter 11, and the reflected light can be received by the laser doppler velocimeter 11. If the speed value measured by the laser Doppler velocimeter 11 at this moment is recorded as v1The standard speed generated by the detection calibration device is denoted as v0Then, the velocity measurement accuracy Δ v of the laser doppler velocimeter 11 can be expressed as:
Δv＝|v0-v1| (1)
wherein v is1Measured by a laser Doppler velocimeter, and v0The rotation speed of the servo motor 1, the distance between the reflecting surface 81 and the center of the rotating disk 7 are determined together, and can be expressed as follows:
v0＝2πrn (2)
wherein r represents the distance between the reflecting surface 81 and the center of the turntable 7, and can be measured by length measuring devices such as a meter ruler, a laser range finder and the like; n represents the rotation speed of the servo motor 1, which can be measured by a speed measuring device.
If the detection distance of the laser doppler velocimeter or the speed measurement precision at different detection distances needs to be detected or calibrated, the distance between the reflection surface 81 of the detection calibration device and the laser doppler velocimeter can be moved, wherein the distance can be accurately measured by metering equipment such as a meter ruler and a laser range finder.
Claims (10)
1. The utility model provides a laser doppler velocimeter detects calibration device which characterized in that: comprises a servo motor (1), a supporting base (3), a transmission shaft (9), a turntable (7), an expansion sleeve (6) and a speed measuring device;
the servo motor (1) is arranged on the supporting base (3), and an output shaft of the servo motor is connected with the transmission shaft (9);
the transmission shaft (9) is arranged on the supporting base (3) through a bearing assembly (5);
the rotary table (7) is of a disc structure and is mounted on the transmission shaft (9) through the expansion sleeve (6), the end face of the rotary table is provided with a plurality of light reflecting plates (8) and a plurality of weight balancing holes (71), the plurality of light reflecting plates (8) are arranged along the circumferential direction of the rotary table (7), and the light reflecting surface (81) of each light reflecting plate (8) reflects laser emitted by the laser Doppler velocimeter back to the laser Doppler velocimeter; a plurality of counterweight holes (71) are uniformly distributed along the circumferential direction of the end surface of the turntable (7) and used for mounting counterweight blocks;
the speed measuring device is used for measuring the rotating speed of the output shaft of the servo motor (1).
2. The detection and calibration device of the laser Doppler velocimeter according to claim 1, characterized in that: the bearing assembly (5) comprises a bearing seat (501), a bearing gland (502), a locking nut (505), a first deep groove ball bearing (503) and a second deep groove ball bearing (504); the bearing seat (501) is fixedly arranged on the supporting base (3), the first deep groove ball bearing (503) and the second deep groove ball bearing (504) are sleeved on the transmission shaft (9) and are respectively arranged on two sides of a shaft hole of the bearing seat (501), one end of the first deep groove ball bearing (503) is limited by a bearing gland (502) and a step arranged on the transmission shaft (9), and the other end of the first deep groove ball bearing is limited by a step arranged in the shaft hole of the bearing seat (501); one end of the second deep groove ball bearing (504) is limited through a step arranged in a shaft hole of the bearing seat (501), and the other end of the second deep groove ball bearing is limited through a locking nut (505) sleeved on the transmission shaft (9).
3. The detection and calibration device of the laser Doppler velocimeter according to claim 2, characterized in that: servo motor (1) is installed on supporting base (3) through motor fixing base (2), motor fixing base (2) are L shape structure, including base plate (21) and curb plate (22), base plate (21) are fixed to be set up on supporting base (3), servo motor (1) is fixed to be set up on curb plate (22).
4. The detection and calibration device of the laser Doppler velocimeter according to claim 3, characterized in that: the upper part of the supporting base (3) is provided with a positioning groove (31), and the substrate (21) is arranged on the supporting base (3) through the positioning groove (31).
5. The detection and calibration device for the laser Doppler velocimeter according to any one of claims 1 to 4, characterized in that: the weight hole (71) is a threaded hole, and the weight block is a weight bolt.
6. The detection and calibration device of the laser Doppler velocimeter according to claim 5, characterized in that: the end face of the rotary table (7) is provided with a plurality of lightening holes (72) for lightening the weight of the rotary table (7).
7. The detection and calibration device of the laser Doppler velocimeter according to claim 6, characterized in that: the center of carousel (7) is provided with installation boss (73), carousel (7) are installed on transmission shaft (9) through installation boss (73), bloated cover (6).
8. The detection and calibration device of the laser Doppler velocimeter according to claim 7, characterized in that: the speed measuring device is specifically a motor rotating speed measuring instrument or an encoder.
9. The detection and calibration device of the laser doppler velocimeter of claim 8, wherein: the side surface of the reflector (8) is provided with a reflective strip or coated with reflective paint, so as to form a reflective surface (81).
10. The detection and calibration device of the laser doppler velocimeter of claim 9, wherein: the output shaft of the servo motor (1) is connected with the transmission shaft (9) through a coupler (10).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021644983.XU CN213023203U (en) | 2020-08-10 | 2020-08-10 | Detection and calibration device for laser Doppler velocimeter |
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| CN202021644983.XU CN213023203U (en) | 2020-08-10 | 2020-08-10 | Detection and calibration device for laser Doppler velocimeter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114152778A (en) * | 2021-12-23 | 2022-03-08 | 中国科学院西安光学精密机械研究所 | Calibration device and method of laser Doppler velocimeter based on lithium niobate modulator |
| CN114578095A (en) * | 2022-03-21 | 2022-06-03 | 中国工程物理研究院计量测试中心 | Calibration device and calibration method for Doppler velocity measurement system |
| CN115639375A (en) * | 2022-10-14 | 2023-01-24 | 武汉新烽光电股份有限公司 | Laser Doppler velocimeter |
-
2020
- 2020-08-10 CN CN202021644983.XU patent/CN213023203U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114152778A (en) * | 2021-12-23 | 2022-03-08 | 中国科学院西安光学精密机械研究所 | Calibration device and method of laser Doppler velocimeter based on lithium niobate modulator |
| CN114152778B (en) * | 2021-12-23 | 2022-09-13 | 中国科学院西安光学精密机械研究所 | Calibration device and method of laser Doppler velocimeter based on lithium niobate modulator |
| CN114578095A (en) * | 2022-03-21 | 2022-06-03 | 中国工程物理研究院计量测试中心 | Calibration device and calibration method for Doppler velocity measurement system |
| CN114578095B (en) * | 2022-03-21 | 2024-04-19 | 中国工程物理研究院计量测试中心 | Calibration device and calibration method for Doppler velocity measurement system |
| CN115639375A (en) * | 2022-10-14 | 2023-01-24 | 武汉新烽光电股份有限公司 | Laser Doppler velocimeter |
| CN115639375B (en) * | 2022-10-14 | 2024-05-07 | 武汉新烽光电股份有限公司 | Laser Doppler velocimeter |
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