CN211954056U

CN211954056U - Laser angle measuring device based on PSD position sensor

Info

Publication number: CN211954056U
Application number: CN202020893240.XU
Authority: CN
Inventors: 师永栋; 王海鹏
Original assignee: Zhuhai Black Mamba Defense Technology Co ltd
Current assignee: Zhuhai Black Mamba Defense Technology Co ltd
Priority date: 2020-05-25
Filing date: 2020-05-25
Publication date: 2020-11-17
Anticipated expiration: 2030-05-25

Abstract

The utility model discloses a laser angle measuring device based on PSD position sensor, include: the laser emitting unit, the laser receiving unit and the pyramid prism cooperate with a target; the laser emission unit comprises a laser generator, an emission optical system component and a spectroscope which are coaxially arranged in sequence from front to back, and the laser receiving unit comprises a PSD position detection module, a multi-path acquisition module and a data resolving module which are electrically connected in sequence; the pyramid prism cooperation target is arranged on the mobile platform, and the mobile platform drives the pyramid prism cooperation target to move. The utility model discloses a PSD position sensor and the cooperation of the cooperation target that has the corner reflector through the calibration process to the device before the test, has eliminated in the follow-up measurement process because the influence of interference signal that environment and background introduced improves the accuracy of test result to the test result.

Description

Laser angle measuring device based on PSD position sensor

Technical Field

The utility model relates to a laser test equips technical field, concretely relates to laser angle measuring device based on PSD position sensor.

Background

With the improvement of technical requirements of aviation, aerospace, navigation, machining and manufacturing, modern military science and technology, nuclear industry technology and the like on the high-precision measurement field, the laser tracking system has higher requirements, and particularly has high requirements on compactness, light weight, convenience, dynamic property, rapidness and measurement precision.

In a laser tracking system, the following two points are required to ensure the tracking effect: one must ensure that the spot is superimposed on all the segments at any time and cannot be smaller than the strip width between the segments; another is to ensure accurate measurements and uniform spot density. Most of the existing laser tracking systems adopt a four-quadrant detector for angle measurement, the four-quadrant detector is a split detector, uniformity of spot density cannot be guaranteed, interference caused by environment and background can be introduced in the measurement process, and the final tracking effect is affected. Therefore, how to reduce the influence of environmental and background noise on the measurement result in the laser tracking system has a great influence on the accuracy of the experimental test result.

SUMMERY OF THE UTILITY MODEL

To the problem that exists among the prior art, the utility model aims to provide a laser goniometer device based on PSD position sensor, at the goniometer in-process in laboratory, adopt PSD position sensor and the cooperation of the cooperation target that has corner reflector, through the calibration process to the device before the test, eliminated in the follow-up measurement process because the influence of the interference signal that environment and background were introduced to the test result, improved the accuracy of test result.

In order to achieve the above purpose, the present invention adopts the following technical solution.

A laser angle measuring device based on a PSD position sensor is used for measuring angles in a laboratory and comprises: the laser emitting unit, the laser receiving unit and the pyramid prism cooperate with a target; the laser emission unit comprises a laser generator, an emission optical system component and a spectroscope which are coaxially arranged in sequence from front to back, and the laser receiving unit comprises a PSD position detection module, a multi-path acquisition module and a data resolving module which are electrically connected in sequence; the pyramid prism cooperation target is arranged on a mobile platform, and the mobile platform drives the pyramid prism cooperation target to move;

the laser generator sends an original laser signal, the original laser signal passes through the optical system assembly and the spectroscope and then is hit on the pyramid prism cooperation target, the original laser signal is reflected to the spectroscope through the reflection of the pyramid prism cooperation target and then enters the PSD position detection module through the light splitting refraction of the spectroscope, the PSD position detection module obtains light spot position information and converts the light spot position information into an electric signal, the multi-path acquisition module acquires the electric signal and transmits the electric signal to the data calculation module through analog-to-digital conversion, and the data calculation module calculates the received digital signal and calculates deflection angle information.

The utility model discloses technical scheme's characteristics lie in with further improvement:

further, the PSD position detection module includes a receiving optical system component, a PSD position sensor and an amplifying circuit, the receiving optical system component is located at the foremost end of the laser receiving unit, and the PSD position sensor is located at the focus of the receiving optical system component.

Furthermore, the receiving optical system component is used for converging the light beams refracted into the laser receiving unit by the spectroscope, so that the focusing light spots fall on the photosensitive surface of the PSD position sensor; the PSD position sensor converts the distance of the light spot from the center position into an electric signal; the amplifying circuit is used for current-voltage conversion and voltage signal amplification.

Further, after the position calibration, the received light beam refracted by the spectroscope into the PSD position detection module falls on the center of the PSD position sensor.

Further, the laser emitting unit forms a laser emitting channel, the laser receiving unit forms a laser receiving unit, and the laser emitting channel and the laser receiving channel are two mutually independent optical channels.

Furthermore, the receiving optical system assembly consists of an optical filter, a first convex lens, a second convex lens and a third convex lens which are coaxially arranged in sequence from front to back.

Furthermore, the radiuses of the first convex lens, the second convex lens and the third convex lens are sequentially reduced, and the thicknesses of the first convex lens, the second convex lens and the third convex lens are sequentially increased.

Further, the transmitting optical system component and the receiving optical system component have the same structure.

Further, the device also comprises an upper computer which is electrically connected with the data resolving module.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model is suitable for a laboratory tracking system simulation process; the PSD position sensor and the pyramid prism are combined, the influence of interference signals introduced by environment and background on a test result in a subsequent measurement process is eliminated through a calibration process of the device before testing, and the accuracy of the test result is improved. The device can rapidly measure the angle of the laser in real time, has the advantages of compactness, light weight, portability, dynamic property and rapidness, and can be used for angle measurement of a target in a dynamic state or a static state.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Fig. 1 is a layout position diagram of a laser emitting unit and a laser receiving unit in a laser angle measuring device based on a PSD position sensor according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a calibration process according to an embodiment of the present invention;

fig. 3 is a schematic diagram of an angle measurement process according to an embodiment of the present invention;

fig. 4 is a connection diagram of the internal structure of the PSD position detection module in the embodiment of the present invention;

in the above figures, 1 laser emitting unit; 11 a laser generator; 12 an emission optical system component; 13 a spectroscope; 2 a laser receiving unit; 21PSD position detection module; 211 receiving an optical system component; 211-1 optical filter; 211-2 a first convex lens; 211-3 second convex lens; 211-4 third convex lens; 212PSD position sensor; 213 an amplifying circuit; 22 a multipath acquisition module; 23, a data resolving module; 3-cube corner prism cooperative target; 4, moving the platform; and 5, an upper computer.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to examples, but those skilled in the art will understand that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention.

Referring to fig. 1-3, the utility model provides a laser angle measurement device based on PSD position sensor 212 for laboratory angle measurement includes: the laser emitting unit 1, the laser receiving unit 2 and the corner cube prism cooperation target 3; the laser emission unit 1 comprises a laser generator 11, an emission optical system component 12 and a spectroscope 13 which are coaxially arranged in sequence from front to back, and the laser receiving unit 2 comprises a PSD position detection module 21, a multi-path acquisition module 22 and a data calculation module 23 which are electrically connected in sequence; the pyramid prism cooperation target 3 is arranged on a mobile platform 4, and the mobile platform 4 drives the pyramid prism cooperation target 3 to move;

the laser generator 11 emits an original laser signal, the original laser signal passes through the optical system component and the spectroscope 13 and then strikes the pyramid prism cooperative target 3, is reflected by the pyramid prism cooperative target 3 to the spectroscope 13, and then enters the PSD position detection module 21 through the spectral refraction of the spectroscope 13, the PSD position detection module 21 acquires the light spot position information and converts the light spot position information into an electric signal, the multi-path acquisition module 22 acquires the electric signal and transmits the electric signal to the data calculation module 23 through analog-to-digital conversion, and the data calculation module 23 calculates the received digital signal and calculates the deflection angle information.

In the above embodiment, the device mainly performs laser angle measurement in a laboratory, referring to fig. 1, a laser emitting unit 1 emits an original laser signal, the original laser signal passes through a laser emitting channel, strikes a pyramid prism cooperation target 3, and enters a laser receiving unit 2 through a laser receiving channel after the cooperation target is subjected to diffuse emission.

The angle measurement process of the device comprises two processes of device calibration and target angle measurement:

as shown in fig. 2, the device calibration process is: in this embodiment, after calibration, the light spot reflected by the corner cube prism cooperation target 3 and entering the laser receiving unit 2 falls on the center position of the detector in the PSD position detection module 21, so that the output voltage signal is 0, that is, the deflection angle is 0, and the displacement difference in the subsequent calculation process is directly the displacement in the angle measurement process, thereby simplifying the calculation process. And carrying out subsequent target angle measurement process by taking the target angle measurement process as a reference.

And (3) target angle measurement process: the pyramid prism cooperation target 3 is driven by the movable platform 4 to move up and down, left and right, and back and forth; the moving platform 4 of the device is a numerical control moving platform, such as a six-axis turntable. For example, as shown in fig. 3, the corner cube cooperation target 3 moves downward by a distance d, the laser generator 11 is started to emit an original laser signal, the original laser signal passes through the optical system assembly and the beam splitter 13 and then strikes the corner cube cooperation target 3 after moving, that is, the laser strikes the inner side wall of the corner cube cooperation target 3, and is reflected by the three faces of the inner corner cube, so that the emergent laser and the incident laser are no longer coincident, but are parallel. The displacement of the distance between the incident light beam space and the emergent light beam space by 2d length can be known by geometrical optical analysis; the reflected laser beam passes through the beam splitter 13 and strikes the detector of the PSD position detection module 21, and the position deviated from the center of the detector is 2 d. And dividing the position deviation 2d of the two times by the distance from the cooperative target to the optical focus of the laser receiving unit 2 to obtain tangent value information of the deflection angle, further obtaining deflection angle information, and outputting the deflection angle value after further signal processing and resolving of the obtained deflection angle information. The deflection angle value can be transmitted to the upper computer 5 or a human-computer interaction interface through a serial port to be displayed.

This device passes through the combination of PSD position detection module 21 and pyramid prism cooperation target 3, through the calibration process to the device before the test for subsequent goniometry process is more accurate, carries out resolving of angle with the displacement difference of twice measurement, can reduce or eliminate the interference signal that environment and background brought to the influence of test result, has improved the accuracy of test.

Referring to fig. 4, according to an embodiment of the present invention, the PSD position detecting module 21 includes a receiving optical system component 211, a PSD position sensor 212 and an amplifying circuit 213, where the receiving optical system component 211 is located at the foremost end of the laser receiving unit 2 and is used for converging the light beam refracted into the laser receiving unit 2 by the spectroscope 13, so that the focusing light spot falls on the photosensitive surface of the PSD position sensor 212; the PSD position sensor 212 is located at a focus of the receiving optical system component 211, and is configured to receive a light spot at the focus, and convert a distance of the light spot from a center position into an electrical signal; the amplifying circuit 213 is used for current-voltage conversion and voltage signal amplification, that is, the electrical signal output by the PSD position sensor 212 is subjected to corresponding signal processing, so as to perform subsequent analog-to-digital conversion and data calculation processes.

Referring to fig. 2, according to the utility model discloses an embodiment, after the position calibration, spectroscope 13 refracts the received beam who gets into in the PSD position detection module 21 and falls on the center of PSD position sensor 212, makes the signal of telecommunication output of calibration process be 0 like this, makes the displacement of subsequent angle measurement in-process can directly participate in calculating convenient and fast.

Referring to fig. 1, according to an embodiment of the present invention, the laser emitting unit 1 forms a laser emitting channel, the laser receiving unit 2 forms a laser receiving unit 2, and the laser emitting channel and the laser receiving channel are two mutually independent optical channels.

In the above embodiment, the laser emission and the laser reception respectively adopt independent optical channels, which are not affected by each other, so that the emitted light beam or the received light beam can be adjusted in one direction, and the influence of each factor in the emission or reception process on the angle measurement result can be obtained, thereby guiding accurate angle measurement and accurate tracking.

Referring to fig. 4, according to an embodiment of the present invention, the receiving optical system assembly 211 is composed of a filter 211-1, a first convex lens 211-2, a second convex lens 211-3, and a third convex lens 211-4 coaxially disposed in sequence from front to back. The radii of the first convex lens 211-2, the second convex lens 211-3 and the third convex lens 211-4 are sequentially reduced, and the thicknesses are sequentially increased.

In the above embodiment, the laser beam reflected by the cooperative target enters the receiving optical system assembly 211 after passing through the beam splitter 13: firstly, filtering out optical signals of redundant spectral bands through an optical filter 211-1 to enable the optical signals of specific bands to penetrate through; the light signal is sequentially reduced through the radius, the thickness of the light signal is sequentially increased through the focusing effect of the first convex lens 211-2, the second convex lens 211-3 and the third convex lens 211-4, so that a focusing light spot finally falls on a photosensitive surface of the four-quadrant detector, and through the design of the three convex lenses, the brightness of the final focusing light spot is large, the light energy loss is small, and the subsequent signal processing process is facilitated.

Referring to fig. 2 and 3, the transmit optical system component 12 and the receive optical system component 211 are identical in structure according to an embodiment of the present invention.

Specifically, after the original laser signal emitted by the laser generator 11 enters the emission optical system component: firstly, filtering out optical signals of redundant spectral bands through an optical filter 211-1 to enable the optical signals of specific bands to penetrate through; the optical signal passes through the focusing action of the first convex lens 211-2, the second convex lens 211-3 and the third convex lens 211-4 with the radius being sequentially reduced and the thickness being sequentially increased, so that a focused light beam passes through the spectroscope 13 and then is irradiated onto a cooperative target, the brightness and the intensity of the laser beam are high, and the subsequent signal acquisition process is facilitated.

Referring to fig. 2 and 3, according to the utility model discloses an embodiment, still contain host computer 5, host computer 5 is connected with data resolving module 23 electricity for further utilize the angle of resolving or show declination information.

The middle PSD position sensor 212 of the present invention is a position sensitive detector, which is a non-split photodiode based on the lateral photoelectric effect, and can form a uniform spot density; the method detects the position of the optical point according to the change of converting the optical signal received on the photosensitive surface into the electric signal, has the characteristics of high position resolution, high response speed and the like, and is mainly applied to the fields of non-contact measurement and calibration of displacement, angle and coaxiality with high precision and high sensitivity.

The utility model discloses the device can utilize laser to carry out quick real-time angle measurement, has compactification, lightweight, portable, developments, advantage fast and that measurement accuracy is high, can accomplish the angle measurement experiment to the sound attitude in the laboratory.

Although the invention has been described in detail in this specification with reference to specific embodiments and illustrative embodiments, it will be apparent to those skilled in the art that certain changes and modifications can be made therein without departing from the scope of the invention. Therefore, such modifications and improvements are intended to be within the scope of the invention as claimed.

Claims

1. A laser angle measurement device based on a PSD position sensor is used for measuring angles in a laboratory, and is characterized by comprising: the laser emitting unit, the laser receiving unit and the pyramid prism cooperate with a target; the laser emission unit comprises a laser generator, an emission optical system component and a spectroscope which are coaxially arranged in sequence from front to back, and the laser receiving unit comprises a PSD position detection module, a multi-path acquisition module and a data resolving module which are electrically connected in sequence; the pyramid prism cooperation target is arranged on a mobile platform, and the mobile platform drives the pyramid prism cooperation target to move;

2. The PSD position sensor based laser angle measuring device of claim 1, wherein the PSD position detection module comprises a receiving optical system component, a PSD position sensor and an amplifying circuit, the receiving optical system component is located at the front end of the laser receiving unit, and the PSD position sensor is located at the focus of the receiving optical system component.

3. The PSD-based laser angle measurement device of claim 2, wherein the receiving optical system component is configured to converge the light beam refracted by the beam splitter into the laser receiving unit, so that the focused light spot falls on the photosensitive surface of the PSD position sensor; the PSD position sensor converts the distance of the light spot from the center position into an electric signal; the amplifying circuit is used for current-voltage conversion and voltage signal amplification.

4. The PSD-based laser angle measuring device of claim 2 wherein the received beam refracted by the beam splitter into the PSD position detection module falls on the center of the PSD position sensor after position calibration.

5. The PSD-based laser angle measurement device of claim 1, wherein the laser emitting unit forms a laser emitting channel, the laser receiving unit forms a laser receiving unit, and the laser emitting channel and the laser receiving channel are two independent optical channels.

6. The PSD-based laser angle measurement device of claim 2, wherein the receiving optical system component comprises a filter, a first convex lens, a second convex lens and a third convex lens, which are coaxially arranged in sequence.

7. The PSD position sensor-based laser angle measuring device of claim 6, wherein the first, second and third convex lenses have successively decreasing radii and successively increasing thicknesses.

8. The PSD-based position sensor laser angle measurement device of claim 7, wherein the transmit optical system component and the receive optical system component are identical in structure.

9. The PSD position sensor-based laser angle measuring device according to claim 1, further comprising an upper computer electrically connected with the data calculation module.