CN106871990A - A kind of method for sounding the depth of the water and laser radar system - Google Patents
A kind of method for sounding the depth of the water and laser radar system Download PDFInfo
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- CN106871990A CN106871990A CN201710286077.3A CN201710286077A CN106871990A CN 106871990 A CN106871990 A CN 106871990A CN 201710286077 A CN201710286077 A CN 201710286077A CN 106871990 A CN106871990 A CN 106871990A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/284—Electromagnetic waves
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- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Optical Radar Systems And Details Thereof (AREA)
Abstract
A kind of method for sounding the depth of the water and laser radar system, are related to technical field of laser detection.Purpose is to solve the problems, such as that prior art high cost, efficiency be low, certainty of measurement is low.The laser pulse signal that the present invention sends to laser carries out linear polarization modulation, in the emitted optical system Vertical Launch of laser pulse signal after modulating linear polarization to the water surface；Echo-signal is received by receiving optics, and two beams are divided into using polarization beam apparatus to echo-signal, the arrival time of two-beam is separately detected using two Gm APD single-photon detectors；Signal processing module calculates the depth of water according to the reaching time-difference of two-beam.Optics low cost used in the present invention, measurement process is simple and easy to apply, and the processing procedure to signal is also simple, and measurement efficiency is high.Wherein Gm APD single-photon detectors can effectively improve measurement sensitivity, or even the echo-signal of deeper water single photon can also be measured, and expand the scope of application of the above method and system.
Description
Technical field
The present invention relates to technical field of laser detection, more particularly to water-depth measurement is realized using echo-signal polarization characteristic
A kind of laser radar system scheme.
Background technology
The measurement of the depth of water is the Main Means that people obtain seabed or river topography data, is to obtain water-bed terrain data
The important means of mapping.Water-bed landform often produces change due to the flowing of water body, and the navigation to ship causes very big peace
Full hidden danger, therefore researchers expand in-depth study to how to obtain the depth of water.The method that tradition obtains the depth of water includes boat-carrying
Sonar contact, airborne laser detection, submersible detection, HYPERSPECTRAL IMAGERY measurement etc..But they generally have high cost, efficiency
Low the characteristics of, the certainty of measurement of certain methods can also be influenceed by seawater clarity.
The content of the invention
The invention aims to solve the problems, such as that prior art high cost, efficiency be low, certainty of measurement is low, there is provided a kind of
The method and laser radar system for sounding the depth of the water.
A kind of method for sounding the depth of the water of the present invention is：
Linear polarization modulation is carried out to the laser pulse signal that laser (1) sends, the laser pulse after modulating linear polarization
The emitted optical system of signal (3) is transmitted on the water surface；
The water surface and water-bed echo-signal are received by receiving optics (4) and is sent to polarization beam apparatus, water surface echo
Signal is transmitted away from polarization beam apparatus (5), and water-bed echo-signal is reflected away from polarization beam splitting, using two Gm-APD monochromatic lights
Sub- detector separately detects the arrival time of two-beam；
Reaching time-difference according to two-beam calculates the depth of water.
A kind of laser radar system for sounding the depth of the water of the present invention includes laser (1), linear polarizer (2), transmitting
Optical system (3), receiving optics (4), polarization beam apparatus (5), a Gm-APD single-photon detectors (6), the 2nd Gm-
APD single-photon detectors (7) and signal processing module (8)；
After the laser that the laser (1) sends is transmitted through linear polarizer (2), by optical transmitting system (3) transmitting to water
Face；
Receiving optics (4) for receiving the water surface and water-bed echo-signal, from the water surface of receiving optics (4) outgoing
It is a branch of to be incident to a Gm-APD single-photon detectors (6) and water-bed echo-signal is divided into two beams through polarization beam apparatus (5), separately
It is a branch of to be incident to the 2nd Gm-APD single-photon detectors (7)；
The detectable signal output end of the first Gm-APD single-photon detectors (6) and the 2nd Gm-APD single-photon detectors (7)
Two detectable signal inputs of signal processing module (8) are connected respectively.
Transmitting laser signal is modulated using linear polarization, using the water surface and the difference of water-bed laser reflection signal during reception：
Relatively flat its reflection characteristic of the water surface is similar to the water surface, and the polarization direction of reflected signal is consistent with the polarization direction of transmission signal；
And the reflected signal at the bottom typically polarizes degeneration than more serious, the polarization direction of some echo-signal can be changed into and transmitting
On the vertical direction in direction.We use a polarization beam apparatus in reception system, can be by the former polarization side of water-reflected
To signal and underwater reflection another polarization direction on signal effectively difference separate so that mono- using two Gm-APD
Photon detector separately detects the echo-signal difference at the water surface and the bottom, and then calculates water outlet according to the flight time of laser signal
It is deep.
Optics low cost used in the present invention, measurement process is very simple and easy to apply, to the processing procedure of signal
Simply, measurement efficiency is high.Wherein Gm-APD single-photon detectors can effectively improve the sensitivity of the system, or even to compared with deep water
The echo-signal of domain single photon can also be measured, and expand the scope of application of the above method and system.
Brief description of the drawings
Fig. 1 is the principle schematic of the laser radar system for sounding the depth of the water of the present invention.
Specific embodiment
Specific embodiment one：Present embodiment, a kind of side for sounding the depth of the water described in present embodiment are illustrated with reference to Fig. 1
Method is：
Linear polarization modulation is carried out to the laser pulse signal that laser (1) sends, the laser pulse after modulating linear polarization
The emitted optical system of signal (3) is transmitted on the water surface close to vertical direction；
The water surface and water-bed echo-signal are received by receiving optics (4) and is sent to polarization beam apparatus, water surface echo
Signal is transmitted away from polarization beam apparatus (5), and water-bed echo-signal is reflected away from polarization beam splitting, using two Gm-APD monochromatic lights
Sub- detector separately detects the arrival time of two-beam；
Reaching time-difference according to two-beam calculates the depth of water.
Present embodiment is modulated to transmitting laser signal using linear polarization, using the water surface and water-bed laser reflection letter during reception
The difference of number (i.e. echo-signal)：Relatively flat its reflection characteristic of the water surface is similar to the water surface, the polarization direction of its echo-signal with
The polarization direction of transmission signal is consistent；And the echo-signal of underwater reflection typically polarizes degeneration than more serious, some echo
The polarization direction of signal can be changed on the direction vertical with the direction of the launch.A polarization beam apparatus are used in reception system,
Can be effective by the echo-signal on another polarization direction of the echo-signal of the former polarization direction of the water surface and water-bed transmitting
Difference is separated, so as to separately detect the echo-signal difference at the water surface and the bottom using two Gm-APD detectors, is believed according to laser
Number flight time calculate the depth of water.
Specific embodiment two：Present embodiment is illustrated with reference to Fig. 1, what a kind of described in present embodiment sounded the depth of the water swashs
Optical detection and ranging system includes laser (1), linear polarizer (2), optical transmitting system (3), receiving optics (4), polarization beam splitting
Device (5), a Gm-APD single-photon detectors (6), the 2nd Gm-APD single-photon detectors (7) and signal processing module (8)；
After the laser that the laser (1) sends is transmitted through linear polarizer (2), by optical transmitting system (3) transmitting to water
Face；
Receiving optics (4) for receiving the water surface and water-bed echo-signal, from the water surface of receiving optics (4) outgoing
It is a branch of to be incident to a Gm-APD single-photon detectors (6) and water-bed echo-signal is divided into two beams through polarization beam apparatus (5), separately
It is a branch of to be incident to the 2nd Gm-APD single-photon detectors (7)；
The detectable signal output end of the first Gm-APD single-photon detectors (6) and the 2nd Gm-APD single-photon detectors (7)
Two detectable signal inputs of signal processing module (8) are connected respectively.
Present embodiment realizes water-depth measurement using the difference in polarisation of transmission signal and echo-signal, and specific method is as follows：
Laser pulse signal is launched by laser first, laser pulse signal carries out the line of transmission signal by linear polarizer
Polarization Modulation, such as be 0 degree (horizontal direction), the signal after warp Polarization Modulation by the modulation of polarization direction of laser pulse signal
Collimated by optical transmitting system and launched, nearly vertical is irradiated on the water surface of underface；
The linearly polarized laser signal for modulating can return to laser radar reception system through flow surface and underwater reflection, its reclaimed water
The reflection characteristic in face is similar to mirror-reflection, therefore the polarization direction of the laser echo signal of water-reflected remains as 0 degree of (level
Direction)；And the laser echo signal of underwater reflection is acted on by the depolarization of seawater and the depolarization of underwater reflection, some signal
Polarization direction can be changed.We are collected using receiving optics to echo-signal in reception system, then echo letter
Number made a distinction by polarization beam apparatus, the echo-signal of the water surface maintains 0 degree of the polarization direction (horizontal direction) of transmission signal,
Can be received by a Gm-APD single-photon detectors (6) with wholly transmissive, the time for receiving echo-signal is t1.Water
The echo-signal at bottom due to the effect of depolarization have one can signal can be reflected, entered by the 2nd Gm-APD single-photon detectors (7)
Row detection, the time for receiving echo-signal is t2.Another part as underwater reflection keeps the signal of former polarization direction, though
A Gm-APD single-photon detectors (6) can be so transmitted to, but because the time of underwater reflection is necessarily later than water-reflected
Time, therefore another part of underwater reflection keeps the signal of former polarization direction to be also later than the signal of water-reflected, a Gm-
The underwater reflection signal that APD single-photon detectors (6) can first respond the water-reflected signal that first reaches and reach after being not responding to, because
This this portion of energy will not be impacted to the result of detection of the system.
The arrival time of water surface echo-signal and water-bed echo-signal is respectively t1And t2, during flight according to laser signal
Between can just extrapolate depth of water R.Wherein c is the light velocity 3 × 108m/s。
Claims (2)
1. a kind of method for sounding the depth of the water, it is characterised in that
Linear polarization modulation is carried out to the laser pulse signal that laser (1) sends, the laser pulse signal after modulating linear polarization
Emitted optical system (3) is transmitted on the water surface；
The water surface and water-bed echo-signal are received by receiving optics (4) and is sent to polarization beam apparatus, water surface echo-signal
Transmitted away from polarization beam apparatus (5), water-bed echo-signal is reflected away from polarization beam splitting, using two Gm-APD single-photon detectings
Survey the arrival time that device separately detects two-beam；
Reaching time-difference according to two-beam calculates the depth of water.
2. a kind of laser radar system for sounding the depth of the water, it is characterised in that including laser (1), linear polarizer (2), launching light
System (3), receiving optics (4), polarization beam apparatus (5), a Gm-APD single-photon detectors (6), the 2nd Gm-APD
Single-photon detector (7) and signal processing module (8)；
After the laser that the laser (1) sends is transmitted through linear polarizer (2), by optical transmitting system (3) transmitting to the water surface；
Receiving optics (4) for receiving the water surface and water-bed echo-signal, from the water surface and water of receiving optics (4) outgoing
Bottom echo signal is divided into two beams through polarization beam apparatus (5), a branch of to be incident to a Gm-APD single-photon detectors (6), another beam
It is incident to the 2nd Gm-APD single-photon detectors (7)；
The detectable signal output end difference of the first Gm-APD single-photon detectors (6) and the 2nd Gm-APD single-photon detectors (7)
Two detectable signal inputs of connection signal processing module (8).
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| CN201710286077.3A CN106871990A (en) | 2017-04-26 | 2017-04-26 | A kind of method for sounding the depth of the water and laser radar system |
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| CN201710286077.3A CN106871990A (en) | 2017-04-26 | 2017-04-26 | A kind of method for sounding the depth of the water and laser radar system |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107260476A (en) * | 2017-07-19 | 2017-10-20 | 李明英 | Multifunctional push type operation table |
| CN109471121A (en) * | 2018-12-29 | 2019-03-15 | 南京睿元光电科技有限公司 | Double dielectric space Laser Photoacoustic radars |
| CN109782292A (en) * | 2019-02-25 | 2019-05-21 | 贵州航天电子科技有限公司 | A kind of laser polarization detection device |
| CN109946710A (en) * | 2019-03-29 | 2019-06-28 | 中国科学院上海技术物理研究所 | A kind of more polarized laser imaging devices of dual wavelength |
| CN110133680A (en) * | 2018-02-09 | 2019-08-16 | 中国人民解放军战略支援部队信息工程大学 | A kind of airborne laser sounding receives waveform useful signal Determination of Initial and system |
| CN110596715A (en) * | 2019-09-20 | 2019-12-20 | 中国有色金属长沙勘察设计研究院有限公司 | Intelligent waterline identification system and positioning method |
| CN110940396A (en) * | 2019-11-02 | 2020-03-31 | 复旦大学 | High-precision laser measuring device for propellant liquid level |
| CN111239713A (en) * | 2020-03-18 | 2020-06-05 | 武汉大学 | Maximum measurement depth evaluation method of satellite-borne single photon laser radar |
| CN113678019A (en) * | 2019-04-02 | 2021-11-19 | ams传感器新加坡私人有限公司 | Optical sensor module using polarized light |
| CN114167436A (en) * | 2021-11-22 | 2022-03-11 | 桂林理工大学 | Single-frequency water measuring laser radar |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107260476A (en) * | 2017-07-19 | 2017-10-20 | 李明英 | Multifunctional push type operation table |
| CN110133680A (en) * | 2018-02-09 | 2019-08-16 | 中国人民解放军战略支援部队信息工程大学 | A kind of airborne laser sounding receives waveform useful signal Determination of Initial and system |
| CN110133680B (en) * | 2018-02-09 | 2022-02-22 | 中国人民解放军战略支援部队信息工程大学 | Airborne laser sounding received waveform effective signal initial value determination method and system |
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| CN109782292A (en) * | 2019-02-25 | 2019-05-21 | 贵州航天电子科技有限公司 | A kind of laser polarization detection device |
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| CN109946710A (en) * | 2019-03-29 | 2019-06-28 | 中国科学院上海技术物理研究所 | A kind of more polarized laser imaging devices of dual wavelength |
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| CN113678019A (en) * | 2019-04-02 | 2021-11-19 | ams传感器新加坡私人有限公司 | Optical sensor module using polarized light |
| CN110596715B (en) * | 2019-09-20 | 2021-07-06 | 中国有色金属长沙勘察设计研究院有限公司 | Intelligent waterline identification system and positioning method |
| CN110596715A (en) * | 2019-09-20 | 2019-12-20 | 中国有色金属长沙勘察设计研究院有限公司 | Intelligent waterline identification system and positioning method |
| CN110940396A (en) * | 2019-11-02 | 2020-03-31 | 复旦大学 | High-precision laser measuring device for propellant liquid level |
| CN111239713A (en) * | 2020-03-18 | 2020-06-05 | 武汉大学 | Maximum measurement depth evaluation method of satellite-borne single photon laser radar |
| CN111239713B (en) * | 2020-03-18 | 2022-03-04 | 武汉大学 | Maximum measurement depth evaluation method of satellite-borne single photon laser radar |
| CN114167436A (en) * | 2021-11-22 | 2022-03-11 | 桂林理工大学 | Single-frequency water measuring laser radar |
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Application publication date: 20170620 |
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