CN106249245B - Laser ranging system and ranging method thereof - Google Patents
Laser ranging system and ranging method thereof Download PDFInfo
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- CN106249245B CN106249245B CN201510308119.XA CN201510308119A CN106249245B CN 106249245 B CN106249245 B CN 106249245B CN 201510308119 A CN201510308119 A CN 201510308119A CN 106249245 B CN106249245 B CN 106249245B
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- laser
- spatial light
- control
- light modulator
- distance measuring
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
- G01S17/06—Systems determining position data of a target
- G01S17/08—Systems determining position data of a target for measuring distance only
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/483—Details of pulse systems
- G01S7/484—Transmitters
Abstract
The invention discloses a laser ranging system and a ranging method thereof, wherein the laser ranging system comprises a transmitting system, a control and measurement circuit and a receiving system, the transmitting system, the control and measurement circuit and the receiving system of the laser ranging system are sequentially connected, the transmitting system consists of a laser source, a beam expanding collimation system and a spatial light modulator, and the laser source, the beam expanding collimation system and the spatial light modulator are sequentially connected. The invention improves the stability and reduces the cost.
Description
Technical Field
The present invention relates to a distance measuring system and a distance measuring method thereof, and more particularly, to a laser distance measuring system and a distance measuring method thereof.
Background
Laser distance measuring (laser distance measuring) measures distance using a laser as a light source. And are classified into a continuous laser and a pulse laser according to the way the laser operates. Helium neon, argon ion, krypton cadmium and other gas lasers work in a continuous output state and are used for phase type laser ranging; the double heterogeneous gallium arsenide semiconductor laser is used for infrared distance measurement; solid lasers such as ruby and neodymium glass are used for pulse type laser ranging. The laser range finder has the advantages that due to the characteristics of good monochromaticity, strong directivity and the like of laser, and the electronic circuit is integrated in a semi-conductor manner, compared with a photoelectric range finder, the laser range finder not only can work day and night, but also can improve the range finding precision, obviously reduce the weight and the power consumption, and enable the distance measurement to a far target such as an artificial earth satellite, a moon and the like to be realized.
A laser rangefinder is an instrument that accurately measures the distance to a target using laser light. When the laser distance measuring instrument works, a thin laser beam is emitted to a target, the photoelectric element receives the laser beam reflected by the target, the timer measures the time from emitting to receiving of the laser beam, and the distance from an observer to the target is calculated. Some laser ranging systems need to constantly change the direction of a laser beam, calculate the shape of an object or calculate whether obstacles exist in different distances by scanning the time of the laser beam reflected back at different angles (for example, laser scanning ranging for automobile active safety), and currently, the change of the emission angle of the laser beam is completed by an electronic scanning galvanometer, so that the problems of high cost, poor stability and the like exist.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a laser ranging system and a ranging method thereof, which utilize interference diffraction of light, change the type and angle of an output light beam according to needs through a spatial light modulator, do not comprise any moving part, improve the stability and reduce the cost.
The invention solves the technical problems through the following technical scheme: a laser ranging system is characterized by comprising a transmitting system, a control and measurement circuit and a receiving system, wherein the transmitting system, the control and measurement circuit and the receiving system of the laser ranging system are sequentially connected, the transmitting system consists of a laser source, a beam expanding collimation system and a spatial light modulator, and the laser source, the beam expanding collimation system and the spatial light modulator are sequentially connected.
Preferably, the spatial light modulator may be connected to an optical system. The optical system may be used to enlarge or reduce the exit angle of the light beam or to mask unwanted diffraction orders.
Preferably, the optical system comprises a lens and a diaphragm.
Preferably, the laser light source adopts a semiconductor laser.
Preferably, the spatial light modulator is liquid crystal on silicon.
The invention also provides a distance measuring method of the laser distance measuring system, which is characterized by comprising the following steps: the laser light source is controlled by the control and measurement circuit to emit laser pulses; the beam expanding and collimating system expands and collimates light emitted by the laser light source and outputs the light to the spatial light modulator; the spatial light modulator is connected with the control and measurement circuit and modulates laser output according to a control signal of the control and measurement circuit; when the light beam output by the spatial light modulator encounters an object, reflection or scattering is generated, the receiving system receives relevant reflection or scattering signals and outputs the relevant reflection or scattering signals to the control and measurement circuit, and the control and measurement circuit calculates the distance between the laser ranging system and the object to be measured according to the time difference between the relevant reflection or scattering signals and the time difference emitted by the laser pulse.
Preferably, the spatial light modulator adopts a phase modulation mode.
Preferably, the control signal includes a data signal and a synchronization signal.
Preferably, the data signal is a hologram.
Preferably, the data signals displayed on the spatial light modulator are pre-stored in the control and measurement circuit.
Preferably, the data signals displayed on the spatial light modulator are generated in real time by control and measurement circuitry.
Preferably, the hologram is generated by fourier transformation or inverse fourier transformation.
Preferably, the hologram is obtained by multiplying a space angular spectrum by a distance factor and then performing inverse Fourier transform or Fourier transform; the spatial light angular spectrum is obtained by performing Fourier transform or inverse Fourier transform on the target light field distribution.
The positive progress effects of the invention are as follows: the laser ranging system improves the stability and reduces the cost. The laser ranging system can be used in the fields of automobile anti-collision warning, laser three-dimensional scanning mapping and the like.
Drawings
Fig. 1 is a schematic structural diagram of a laser ranging system according to the present invention.
Detailed Description
The following provides a detailed description of the preferred embodiments of the present invention with reference to the accompanying drawings.
As shown in fig. 1, the laser ranging system of the present invention includes a transmitting system, a control and measurement circuit, and a receiving system, the transmitting system, the control and measurement circuit, and the receiving system are connected in sequence, the transmitting system is composed of a laser source, a beam expanding collimation system, and a spatial light modulator, and the laser source, the beam expanding collimation system, and the spatial light modulator are connected in sequence. The beam expanding and collimating system and the receiving system can respectively adopt the existing beam expanding and collimating system and receiving system, such as the design of a receiving system of a phase type laser range finder, which is a thesis of Changchun university and is fixed in 2010. The expanded beam collimation system can adopt the expanded beam collimation system of Chinese patent with patent number '201010191189.9' and patent name 'holographic waveguide display and holographic image generation method thereof'.
The spatial light modulator may be coupled to an optical system that may include lenses and apertures, the lenses being used to magnify or de-magnify the angle of the output light. The diaphragm is used to mask the light beam generated by the unwanted diffraction orders.
The distance measuring method of the laser distance measuring system comprises the following steps: the laser light source is controlled by the control and measurement circuit to emit laser pulses, the laser light source can adopt a semiconductor laser and can use visible light or invisible light (such as 650nm wave band or 808nm wave band); the beam expanding and collimating system expands and collimates light emitted by the laser light source and outputs the light to the spatial light modulator; the spatial light modulator is connected with a control and measurement circuit (for example, an LVDS or RGB888 interface is used for connection), and the laser output is modulated according to a control signal of the control and measurement circuit; when the light beam output by the spatial light modulator encounters an object, reflection or scattering (diffuse reflection) is generated, the receiving system receives a relevant reflection or scattering (diffuse reflection) signal and outputs the relevant reflection or scattering (diffuse reflection) signal to the control and measurement circuit, and the control and measurement circuit calculates the distance between the laser ranging system and the object to be measured (obstacle) according to the time difference between the relevant reflection or scattering (diffuse reflection) signal and the time difference emitted by the laser pulse.
The control and measurement circuit simultaneously supplies power to the spatial light modulator and the laser light source. The control signal comprises a data signal (e.g., a hologram) such as a single beam, multiple beams or a line laser controlled to output a certain angle. The hologram can be pre-stored in the measurement control circuit after being calculated by an external computer in advance, and the measurement control circuit selects a beam type signal (hologram) in real time according to requirements to control the type (such as single point, multiple points and lines) and the emergent angle of the emergent beam in an interference diffraction mode. A hologram) may be generated in real time by the measurement control circuitry. For example, according to fraunhofer diffraction, distances other than several meters can be equivalent to infinity, the beam point position is calculated according to a required emergent angle, a corresponding hologram (only quantized phase information is reserved, and intensity information is normalized or discarded) is obtained through fourier transform or inverse fourier transform, and the hologram is output to the spatial light modulator. Also for example, at closer distances, a better quality outgoing beam can be obtained from fresnel diffraction using fractional fourier or inverse fractional fourier transforms. For example, the spatial angular spectrum of the target light field may be multiplied by a distance factor (calculated from the propagation distance) to obtain angular spectrum information on the spatial light modulator, and then subjected to inverse fourier transform or fourier transform to obtain a desired amplitude and phase distribution, and then processed (e.g., amplitude is discarded, phase is retained, or phase is quantized) and output to the spatial light modulator. The spatial angular spectrum information can be obtained according to the required light beam angle, and can also be obtained by using Fourier transform or inverse Fourier transform on the target light field. The control signal also comprises a synchronous signal which synchronizes the laser pulse emitted by the laser light source, the spatial light modulator and the receiving system. The spatial light modulator adopts a phase modulation mode. The spatial light modulator may use liquid crystal on silicon (LCoS).
The control and measurement circuit controls the laser pulse frequency emitted by the laser light source and can adjust the pulse intensity. The control and measurement circuit controls the phase information (hologram) on the spatial light modulator, which can be generated in advance, stored in the control and measurement circuit, selectively displayed as required by the control and measurement circuit, or generated in real time by the control and measurement circuit. The control and measurement circuit synchronizes the laser pulses, the phase information of the display on the spatial light modulator and the receiving system.
The above embodiments are described in further detail to solve the technical problems, technical solutions and advantages of the present invention, and it should be understood that the above embodiments are only examples of the present invention and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (12)
1. The utility model provides a laser rangefinder system, its characterized in that, it includes transmitting system, control and measuring circuit, receiving system, and laser rangefinder system transmitting system, control and measuring circuit, receiving system connect gradually, and transmitting system comprises laser light source, beam expanding collimation system, spatial light modulator, and laser light source, beam expanding collimation system, spatial light modulator connect gradually, spatial light modulator utilizes the interference diffraction of light, changes the type and the angle of output beam as required, spatial light modulator adopts the phase modulation mode.
2. The laser ranging system of claim 1 wherein the spatial light modulator is coupled to an optical system.
3. The laser ranging system of claim 2, wherein the optical system comprises a lens and an aperture.
4. The laser ranging system of claim 1, wherein the laser light source employs a semiconductor laser.
5. The laser ranging system of claim 1 wherein the spatial light modulator is liquid crystal on silicon.
6. A distance measuring method of a laser distance measuring system is characterized by comprising the following steps: the laser light source is controlled by the control and measurement circuit to emit laser pulses; the beam expanding and collimating system expands and collimates light emitted by the laser light source and outputs the light to the spatial light modulator; the spatial light modulator is connected with the control and measurement circuit and modulates laser output through interference diffraction according to a control signal of the control and measurement circuit; when the light beam output by the spatial light modulator encounters an object, reflection or scattering is generated, the receiving system receives a relevant reflection or scattering signal and outputs the relevant reflection or scattering signal to the control and measurement circuit, and the control and measurement circuit calculates the distance between the laser ranging system and the object to be measured according to the time difference between the relevant reflection or scattering signal and the time difference emitted by the laser pulse; the spatial light modulator adopts a phase modulation mode.
7. The ranging method of the laser ranging system as claimed in claim 6, wherein the control signal comprises a data signal and a synchronization signal.
8. The ranging method of the laser ranging system of claim 7, wherein the data signal is a hologram.
9. The distance measuring method of the laser distance measuring system according to claim 8, wherein the data signal displayed on the spatial light modulator is previously stored in the control and measurement circuit.
10. The distance measuring method of the laser distance measuring system of claim 8, wherein the data signal displayed on the spatial light modulator is generated in real time by a control and measurement circuit.
11. The distance measuring method of the laser distance measuring system of claim 8, wherein the hologram is generated by fourier transform or inverse fourier transform.
12. The distance measuring method of the laser distance measuring system according to claim 8, wherein the hologram is obtained by multiplying a spatial angular spectrum by a distance factor and then performing an inverse fourier transform or a fourier transform; the spatial light angular spectrum is obtained by performing Fourier transform or inverse Fourier transform on the target light field distribution.
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| CN201510308119.XA CN106249245B (en) | 2015-06-08 | 2015-06-08 | Laser ranging system and ranging method thereof |
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| CN201510308119.XA CN106249245B (en) | 2015-06-08 | 2015-06-08 | Laser ranging system and ranging method thereof |
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| CN106249245B true CN106249245B (en) | 2021-03-09 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108393579A (en) * | 2017-02-07 | 2018-08-14 | 京东方科技集团股份有限公司 | Laser processing device and laser processing |
| CN107132543B (en) * | 2017-05-08 | 2019-09-10 | 上海擎朗智能科技有限公司 | A kind of range-measurement system |
| CN110687516B (en) * | 2018-07-06 | 2022-10-04 | 江苏慧光电子科技有限公司 | Control method, device and system for light beam scanning and corresponding medium |
| CN109375233B (en) * | 2018-10-31 | 2021-03-30 | 江苏蓝缕机电液一体化科技有限公司 | Laser range finder based on optical orbital angular momentum spatial multiplexing |
| CN110954914B (en) * | 2019-12-17 | 2023-03-31 | 北京缔科新技术研究院(有限合伙) | Non-blind area light quantum distance meter and distance measuring method |
| CN111123284B (en) * | 2019-12-26 | 2022-02-11 | 宁波飞芯电子科技有限公司 | Detection method and detection device |
| CN112731420B (en) * | 2020-12-23 | 2024-03-22 | 华中光电技术研究所（中国船舶重工集团公司第七一七研究所） | Laser ranging system without mechanical movement scanning |
| CN113107784B (en) * | 2021-04-08 | 2022-05-17 | 中国华能集团清洁能源技术研究院有限公司 | Laser correction method, device, equipment and medium for wind turbine generator blade angle |
| CN114879210B (en) * | 2022-07-12 | 2022-09-20 | 吉光半导体科技有限公司 | Target object motion monitoring method and device and computer equipment |
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