CN116358698A - Laser output energy monitoring device and method - Google Patents
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- CN116358698A CN116358698A CN202310261742.9A CN202310261742A CN116358698A CN 116358698 A CN116358698 A CN 116358698A CN 202310261742 A CN202310261742 A CN 202310261742A CN 116358698 A CN116358698 A CN 116358698A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/4257—Photometry, e.g. photographic exposure meter using electric radiation detectors applied to monitoring the characteristics of a beam, e.g. laser beam, headlamp beam
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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
- G01S7/497—Means for monitoring or calibrating
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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Abstract
The invention relates to a laser output energy monitoring device and a method, wherein the laser output energy monitoring device comprises: the signal observation module is used for receiving the scattered light signal of the light beam to be monitored, converting the scattered light signal into a current signal and outputting the current signal; the signal processing module is used for processing the current signal output by the signal observation module and outputting a voltage signal representing the energy of the light beam to be monitored; the signal storage module is used for storing the voltage signal representing the energy of the light beam to be monitored, which is output by the signal processing module, and converting the voltage signal into a real-time energy value of the light beam to be monitored. The invention overcomes the problem that the common energy monitoring equipment needs to split the laser to be monitored in the use process by monitoring the scattered light signal of the beam to be monitored in real time, and does not occupy the total energy of the existing laser; the invention does not need to make laser beam incident on the probe in the monitoring process, thus having real-time monitoring capability and simplifying the monitoring operation process.
Description
Technical Field
The invention relates to the field of laser energy monitoring, in particular to a device and a method for monitoring output energy of a laser.
Background
The laser radar is a kind of laser radar which uses laser as a detection source, emits a beam of pulse laser beam with high directivity and high energy, and the light interacts with substances in the atmosphere to generate back scattering light, and the back scattering light is collected and processed by an optical receiving system, a data collecting system and the like, and finally the physical parameters of the atmosphere are obtained by inversion. According to the lidar equation, the energy of the laser emitted by the lidar is related to the intensity of the echo optical signal, so that the change of the emitted energy of the laser will also have an effect on the echo optical signal. The main equipment of the laser radar transmitting system is a laser, and the output energy of the laser can be changed along with the working state and the service condition of the laser. Therefore, the laser energy needs to be monitored in real time, echo signal data are corrected, errors caused by inversion results are avoided, and the detection precision of the laser radar is improved. During daily observation, in order to obtain more accurate detection data, the laser radar is used for periodically monitoring the energy and the emission direction of laser, and whether the detection state of the laser radar has a problem can be judged by analyzing and comparing the number of detected echo photons. Thus, energy monitoring is an essential element in detection.
However, in a common energy meter, a laser beam must be incident on a probe to be monitored, and in the case of a laser radar, detection beam splitting is required to monitor or directly monitor all output energy, so that the method can lose the emitted laser energy of the laser radar or directly interrupt detection. And this is not a real-time monitoring and cannot be corrected in real time one by one. For lidar detection, a high detection energy will result in a better echo light signal, improving the signal to noise ratio, no loss of detection energy and the ability to monitor the emitted laser energy in real time would be beneficial for lidar detection.
The existing laser radar transmitting device generally monitors the energy measured by a laser light outlet, and does not directly transmit the energy to the sky, but the laser light is transmitted to the sky from the laser light outlet, a plurality of turning mirrors and a beam expanding system may need to be added in the middle to transmit the laser light to the sky, so that the energy data measured by the laser light outlet is not accurate enough as the energy detected by the laser radar.
Disclosure of Invention
The invention aims to provide a device and a method capable of monitoring laser radar emission energy in real time, which can monitor laser energy by weak light and judge the laser emission energy in real time under the condition that laser emission of the laser radar is not required to be split.
Specifically, the invention provides a laser output energy monitoring device, comprising: the signal observation module is used for receiving the scattered light signal of the light beam to be monitored, converting the scattered light signal into a current signal and outputting the current signal; and the signal processing module is used for processing the current signal output by the signal observation module and outputting a voltage signal representing the energy of the light beam to be monitored.
Correspondingly, the invention provides a laser output energy monitoring method, which comprises the following steps:
s1. setting the laser output energy monitoring device according to any of claims 1-8 at a predetermined distance from the beam to be monitored, preferably the laser output energy monitoring device is horizontally coplanar with the emission position of the beam to be monitored.
S2, giving at least two known laser output energy values, obtaining at least two corresponding voltage signals representing the energy of the beam to be monitored, and further determining the linear relation between the laser output energy values and the voltage signals representing the energy of the beam to be monitored;
s3, monitoring the output energy of the laser according to the voltage signal representing the energy of the light beam to be monitored, which is obtained in real time, and the linear relation in S2.
Compared with the prior art, the invention has the technical effects that: the invention overcomes the problem that the common energy monitoring equipment needs to split the laser to be monitored in the use process by monitoring the scattered light signal of the beam to be monitored in real time, and does not occupy the total energy of the existing laser; in addition, the invention does not need to make laser beam incident on the probe in the monitoring process, thus having real-time monitoring capability and simplifying the monitoring operation process.
Drawings
FIG. 1 is a schematic diagram of a laser output energy monitoring device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating the connection of a laser output energy monitoring device according to an embodiment of the present invention;
fig. 3 is a schematic diagram showing an embodiment of a laser output energy monitoring device according to an embodiment of the present invention for a lidar.
Reference numerals: 1. the device comprises a shell, 2, an observation window, 3, a photosensor, 4, an optical platform, 5, a laser emitting device, 6, a strong laser reflecting device, 7, a laser output energy monitoring device, 71, an optical triggering signal, 74, an energy monitoring signal, 8, an industrial personal computer, 9, an oscilloscope, 10, a data acquisition card, 11, a single photon detecting device, 12, an echo signal transmission optical fiber, 13, an optical fiber coupling device, 14 and a receiving telescope device.
Detailed Description
1. Structure and working process of laser output energy monitoring device
The invention discloses a laser output energy monitoring device, which comprises: the signal observation module is used for receiving the scattered light signal of the light beam to be monitored, converting the scattered light signal into a current signal and outputting the current signal; and the signal processing module is used for processing the current signal output by the signal observation module and outputting a voltage signal representing the energy of the light beam to be monitored.
Wherein, the signal observation module includes: the device comprises a shell 1, wherein an observation window 2 is formed in the surface of the shell 1, and a filter material is covered on the surface of the observation window 2 so as to reduce the influence of ambient light on an observation result; and the photosensor 3 is arranged in the shell 1, receives a scattered light signal of the light beam to be monitored through the observation window 2, and converts the scattered light signal into a current signal to be output.
The photosensor 3 may take a suitable form, preferably, the photosensor 3 is a photodiode, and the type of the photodiode is selected according to the wavelength and intensity of the optical signal to be detected, and may be a silicon diode for detecting visible light, a gallium arsenide diode, and other flexible photodiodes that need detection capability corresponding to the detection wavelength; the frequency characteristic of the optical filter material is selected according to the wavelength of an optical signal to be detected, the bandwidth of the optical filter material is less than or equal to 10nm, and the transmittance of the optical filter material is more than or equal to 90%.
In order to improve the effect of the photosensitive device in receiving the scattered light signal of the light beam to be monitored, the observation window 2 is arranged to protrude out of the outer surface of the shell 1; and the position of the photosensor 3 is set to be capable of moving according to the working state of the signal observation module: when the signal observation module performs observation, the photosensor 3 can move into the convex observation window 2; when the signal observation module is observed, the photosensor 3 can return to the inside of the shell 1.
In order to enable the laser output energy monitoring device of the present invention to be used in a narrow space, it is preferable that the convex observation window 2 is provided in a cubic or hemispherical shape, and the side length or diameter thereof is set to be 4mm or less; and/or the housing 1 is provided as a cube, the dimensions of which are set to 15mm by 15mm.
The bottom and sides of the housing 1 may be provided with threaded holes for mounting on a conventional optical mounting bracket.
The signal processing module includes: and the signal amplifying unit is used for converting the current signal output by the signal observing module into a voltage signal and amplifying the voltage signal. Specifically, the signal amplifying unit includes a high-sensitivity low-noise amplifier, and amplifies a weak optical signal collected by a photodiode by the low-noise amplifier through circuit conversion; the signal amplified by the signal amplifying module can be divided into two parts: part of the light is output as a synchronous light trigger signal through a signal shaping module; one part of the energy is used as energy monitoring output through an energy signal output module; and the signal acquisition unit is used for carrying out analog-to-digital conversion on the voltage signal output by the signal amplification unit and outputting a voltage signal representing the energy of the light beam to be monitored.
In order that the laser output energy monitoring device of the present invention may also output an optical trigger signal for synchronizing other signal receiving systems of the lidar, preferably, the signal processing module includes a signal shaping unit for converting a waveform of the voltage signal output by the signal amplifying unit from a continuous signal to a pulse signal and outputting the pulse signal as a trigger signal.
In addition, the laser output energy monitoring device further includes: the signal transmission module is used for transmitting the signal output by the signal processing module to external equipment; and a power module for supplying power to the device, which can adopt button cells; and the storage module is used for storing and/or displaying the signals output by the signal processing module.
The working process of the laser output energy monitoring device comprises the following steps:
s1, horizontally and coplanarly setting the laser output energy monitoring device and the emission position of a light beam to be monitored, and keeping a preset distance;
s2, giving at least two known laser output energy values, obtaining at least two corresponding voltage signals representing the energy of the beam to be monitored, and further determining the linear relation between the laser output energy values and the corresponding voltage signals representing the energy of the beam to be monitored;
s3, monitoring the output energy of the laser according to the voltage signal representing the energy of the light beam to be monitored, which is obtained in real time, and the linear relation in S2.
2. Examples: high-altitude sodium fluorescent laser radar system emission energy real-time monitoring and simultaneous triggering data acquisition system
The invention is applied to a high-altitude sodium fluorescence laser radar system, and the laser radar is used for detecting sodium layer density signals. As shown in fig. 3, the laser emitting device 5 is placed on the optical stage 4, and 589nm yellow light emitted from the laser emitting device 5 is emitted to the strong laser reflecting device 6, and the 589nm detection laser is emitted to the sky through the optical path turning. The echo light signal received by the receiving telescope device 14 is inputted to the echo signal transmission optical fiber 12 through the optical fiber coupling device 13, and is sent to the single photon detection device 11. The electric signal output by the single photon detection device 11 is divided into two paths and respectively sent to the oscilloscope 9 and the data acquisition card 10, the data acquisition card 10 is arranged on the industrial personal computer 8, and the acquired data are finally stored in the industrial personal computer 8. The laser output energy monitoring device 7 of the invention outputs a synchronous light trigger signal 71 and an energy monitoring signal 74 to act on the laser radar control system to assist in realizing the detection function of the laser radar. The laser output energy monitoring device 7 is arranged at the concentric circle position of the light beam emitted by the laser radar in the sky, and the bracket is fixed on the optical platform 4.
The light sensor 3 in the laser output energy monitoring device 7 receives the diffuse reflection light of the emitted laser, and converts the diffuse reflection light into a current signal corresponding to the intensity of the light signal after being received by the photoelectric tube, and the current signal is weak, so that the current signal is required to be subjected to current-voltage conversion, and the voltage signal corresponding to the current signal is amplified by the amplifying circuit module, and finally the voltage signal is stored in the industrial personal computer 8 after passing through the data acquisition card 10. The other path of voltage amplified signal of the laser output energy monitoring device 7 is formed by signal shaping into an optical trigger signal which is sent to the oscilloscope 9 for synchronizing the received echo photon signals. ( 1. The constant current source power supply provides stable voltage output for the photoelectric tube, weak signal light diffusely reflected by laser passes through the optical filter and then enters the receiving end of the photoelectric tube, the optical signal is converted into an electric signal, the electric signal is a current signal, the electric signal is input to the signal amplifier module after passing through the current-to-voltage circuit, the signal is amplified and output, the amplified signal is input to the signal shaping circuit module and is converted into a corresponding electric pulse signal, the pulse signal is used as a trigger signal, and the frequency of the pulse signal is consistent with that of the pulse signal received by the detector; 2. the amplifying circuit module outputs another path of signal, converts the analog quantity into a digital signal through the data acquisition module, and displays the energy through the industrial personal computer. )
For example, in this embodiment, the device is placed at a radius of 3cm around the center of the emitted beam, and the laser real-time energy is monitored.
Before monitoring, after fixing the position of the device, measuring the position of the beam center from the detector, and recording the position into an energy display module; according to the linear relation P of the detectors out ＝A*V o +B, firstly measuring two laser emission energy values and signal value output by amplifier. For example, when the input single pulse energy is 27.2mJ, V o The output is 66.17mv; v when the input single pulse energy is 28.2mJ o The output is 69.44mv; after the 4 values are recorded into the energy display module, the upper computer can determine that the linear relation of the detector is P out ＝0.3058*V o +6.9645; therefore, the energy can be monitored in real time at this time, and when an amplifier measurement value is available, the laser energy is displayed on the energy display module, and an energy graph is given.
The innovation point of the invention is that: the laser energy can be monitored by weak light; especially for the energy monitoring function, the device does not occupy the energy of the original laser. Thoroughly changing the traditional energy monitoring mode; the method can monitor at multiple points simultaneously, and the detection results are mutually verified; the laser energy value and the synchronous light trigger signal can be output simultaneously; the device is a miniature device, and has more advantages especially for detecting equipment with narrow space; the problem that the inside of some equipment cannot extend into the detector for detection is solved.
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the scope of the technical concept of the present invention, and all the simple modifications belong to the protection scope of the present invention.
In addition, the specific features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described further.
Moreover, any combination of the various embodiments of the invention can be made without departing from the spirit of the invention, which should also be considered as disclosed herein.
Claims (10)
1. A laser output energy monitoring device, comprising:
the signal observation module is used for receiving the scattered light signal of the light beam to be monitored, converting the scattered light signal into a current signal and outputting the current signal;
the signal processing module is used for processing the current signal output by the signal observation module and outputting a voltage signal representing the energy of the light beam to be monitored; and
the signal storage module is used for storing the voltage signal representing the energy of the light beam to be monitored, which is output by the signal processing module, and converting the voltage signal into a real-time energy value of the light beam to be monitored.
2. The laser output energy monitoring device of claim 1, wherein the signal observation module comprises:
the optical filter comprises a shell (1), wherein an observation window (2) is formed in the surface of the shell (1), and a filter material is covered on the surface of the observation window (2); and
the photosensitive device (3) is arranged in the shell (1), receives a scattered light signal of a light beam to be monitored through the observation window (2), and converts the scattered light signal into a current signal to be output.
3. The laser output energy monitoring device according to claim 2, wherein the observation window (2) protrudes from the outer surface of the housing (1);
the position of the photosensitive device (3) is set to be capable of moving according to the working state of the signal observation module: when the signal observation module performs observation, the photosensitive device (3) can move into the protruding observation window (2); when the signal observation module is used for observing, the photosensor (3) can return to the shell (1).
4. A laser output energy monitoring device according to claim 3, characterized in that the protruding observation window (2) is provided as a cube or a hemisphere, the side length or diameter of which is set to be 4mm or less; and/or the housing (1) is provided as a cube, the dimensions of which are set to be 15mm by 15mm.
5. The laser output energy monitoring device according to claim 2, characterized in that the photosensitive device (3) is a photodiode, the kind of which is selected according to the wavelength and intensity of the optical signal to be measured; and/or the frequency characteristic of the optical filter material is selected according to the wavelength of the optical signal to be detected, the bandwidth of the optical filter material is less than or equal to 10nm, and the transmittance of the optical filter material is more than or equal to 90%.
6. The laser output energy monitoring device of claim 1, wherein the signal processing module comprises:
the signal amplifying unit is used for converting the current signal output by the signal observing module into a voltage signal and amplifying the voltage signal; and
the signal acquisition unit is used for carrying out analog-to-digital conversion on the voltage signal output by the signal amplification unit and outputting a voltage signal representing the energy of the light beam to be monitored.
7. The laser output energy monitoring device as claimed in claim 6, wherein the signal processing module includes a signal shaping unit for converting an analog signal output from the signal amplifying unit into a pulse signal and outputting the pulse signal as a trigger signal.
8. The laser output energy monitoring device of claim 1, further comprising:
the signal transmission module is used for transmitting the signal output by the signal processing module to external equipment; and
and the power supply module is used for supplying power to the laser output energy monitoring device.
9. A method of monitoring laser output energy, comprising the steps of:
s1, setting a laser output energy monitoring device according to any one of claims 1-8 at a preset distance from a light beam to be monitored;
s2, giving at least two known laser output energy values, obtaining at least two corresponding voltage signals representing the energy of the beam to be monitored, and further determining the linear relation between the laser output energy values and the corresponding voltage signals representing the energy of the beam to be monitored;
s3, monitoring the output energy of the laser according to the voltage signal representing the energy of the light beam to be monitored, which is obtained in real time, and the linear relation in S2.
10. The method of claim 9, wherein the laser output energy monitoring device in S1 is disposed horizontally coplanar with the emission location of the beam to be monitored.
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| CN202310261742.9A CN116358698A (en) | 2023-03-17 | 2023-03-17 | Laser output energy monitoring device and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117168612A (en) * | 2023-09-27 | 2023-12-05 | 华安钢宝利高新汽车板加工(常熟)有限公司 | Laser luminous power monitoring device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117168612A (en) * | 2023-09-27 | 2023-12-05 | 华安钢宝利高新汽车板加工(常熟)有限公司 | Laser luminous power monitoring device |
| CN117168612B (en) * | 2023-09-27 | 2024-01-02 | 华安钢宝利高新汽车板加工(常熟)有限公司 | Laser luminous power monitoring device |
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