CN111880163B - Method and system for detecting performance of transmitting device - Google Patents
Method and system for detecting performance of transmitting device Download PDFInfo
- Publication number
- CN111880163B CN111880163B CN202010624852.3A CN202010624852A CN111880163B CN 111880163 B CN111880163 B CN 111880163B CN 202010624852 A CN202010624852 A CN 202010624852A CN 111880163 B CN111880163 B CN 111880163B
- Authority
- CN
- China
- Prior art keywords
- emergent light
- signal
- transmitting device
- light signal
- pulse width
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
- Optical Radar Systems And Details Thereof (AREA)
Abstract
The invention provides a method and a system for detecting the performance of a transmitting device. The method for detecting the performance of the transmitting device comprises the following steps: driving an emitting device to be tested to emit an emitting light signal by a preset strategy; receiving the emergent light signal and acquiring the performance parameter of the emergent light signal; and screening the emission device to be tested according to the performance parameters of the emergent light signals. The performance of the transmitting device has a direct influence on the range finding capability of the lidar, in particular the peak power of the transmitting device. The emission device is driven to emit according to a preset strategy, performance parameters are measured through the emergent light signals, all emission devices to be tested are ensured to be in the same driving environment, and the obtained performance parameters are only related to the performance of the emission device. Then, screening the launching devices according to the obtained performance parameters, and screening launching devices with similar performance; the transmitting device after screening is applied to the laser radar, so that the difference among different channels can be effectively reduced, and the accuracy of laser radar detection is improved.
Description
Technical Field
The invention relates to the technical field of semiconductor laser performance detection, in particular to a method and a system for detecting the performance of an emitting device.
Background
The laser radar is a system for detecting characteristic information such as position, speed and the like of a target by emitting laser with specific wavelength and direction and receiving corresponding reflected laser, and is widely applied to the fields of distance measuring systems, target tracking measurement, weapon guidance, atmosphere monitoring, surveying and mapping, early warning, traffic management and the like at present.
The emitting device may include a laser, and driving hardware, etc., and the driving hardware drives the laser to emit light normally. Due to the discreteness of electronic components, the performance of the laser is inconsistent under the same control strategy; in addition, the laser is typically soldered to corresponding drive hardware (e.g., drive circuitry). Manufacturers generally do not focus on differences in the welding and the performance of the laser itself. And the difference of the emitting devices directly causes the difference between different channels of the laser radar.
Disclosure of Invention
Therefore, it is necessary to provide a method and a system for detecting the performance of the transmitting device, aiming at the problem of differences in screening of the transmitting devices at present.
The invention provides a method for detecting the performance of a transmitting device, which comprises the following steps:
driving an emitting device to be measured to emit an emitting light signal by preset measurement;
receiving the emergent light signal and acquiring the performance parameters of the emergent light signal;
and screening the emission device to be tested according to the performance parameters of the emergent light signals.
In one embodiment, the receiving the outgoing optical signal and obtaining the performance parameter of the outgoing optical signal includes:
dividing the emergent light signal into a first laser signal and a second laser signal;
receiving the first laser signal to obtain the pulse width of the emergent light signal, and receiving the second laser signal to obtain the average power of the emergent light signal;
and calculating the peak power of the emergent light signal according to the pulse width and the average power.
In one embodiment, the screening the emission device to be tested according to the performance parameter of the outgoing optical signal includes:
comparing the peak power of the emergent signal with a preset power threshold value, and comparing the pulse width of the emergent signal with a preset pulse width threshold value;
dividing the transmitting devices to be detected, of which the peak power of the corresponding emergent signals is greater than the preset power threshold and the pulse width is less than the preset pulse width threshold, into a first group;
and dividing the corresponding emitting devices to be tested, of which the peak power of the emergent signals is less than or equal to the preset power threshold value, and/or the corresponding emitting devices to be tested, of which the pulse width of the emergent signals is greater than or equal to the preset pulse width threshold value, into a second group.
In one embodiment, the method for detecting the performance of the transmitting device further comprises:
and adjusting the preset power threshold value according to a power adjustment coefficient before comparing the peak power with the preset power threshold value.
In one embodiment, the same power adjustment coefficient is used for the transmitting devices to be tested of the same model.
In one embodiment, the average power of the transmitting device to be tested is detected by a power meter;
the power adjustment coefficient is a parameter related to a reception aperture of the power meter.
In one embodiment, the dividing the outgoing optical signal into a first laser signal and a second laser signal includes:
the emergent light signals emitted by the emission device to be tested are collimated by a collimating mirror, the collimated emergent light signals are emitted to a light splitter, and the light splitter is used for splitting the emergent light signals into the first laser signals and the second laser signals.
In one embodiment, the method for detecting the performance of the transmitting device further comprises:
and before the transmitting device to be detected is driven by the preset power, fixing the transmitting device to be detected on a base of a transmitting device detection system.
Based on the same inventive concept, the embodiment of the present invention further provides a system for detecting the performance of a transmitting device, including:
the transmitting device to be tested is used for transmitting a transmitting light signal under the drive of a preset strategy;
the detection module is used for receiving the emergent light signal and acquiring the performance parameter of the emergent light signal;
and the comparison module is electrically connected with the detection module and used for screening the emitting device to be detected according to the performance parameters of the emergent light signals.
In one embodiment, the system for detecting the performance of the transmitting device further comprises a base, wherein a clamping groove is formed in the base and used for fixing the transmitting device to be detected.
In summary, the embodiments of the present invention provide a method and a system for detecting performance of a transmitting device. The method for detecting the performance of the transmitting device comprises the following steps: driving an emitting device to be tested to emit an emitting light signal by a preset strategy; receiving the emergent light signal and acquiring the performance parameter of the emergent light signal; and screening the emission device to be tested according to the performance parameters of the emergent light signals. The performance of the transmitting device has a direct influence on the range finding capability of the lidar, especially the peak power of the transmitting device. The emission device is driven to emit by a preset strategy, performance parameters are measured through emergent light signals, all emission devices to be tested are ensured to be in the same driving environment, and the obtained performance parameters are only related to the performance of the emission device. Screening the launching devices according to the obtained performance parameters, and screening out launching devices with similar performance; the transmitting device after screening is applied to the laser radar, so that the difference among different channels can be effectively reduced, and the accuracy of laser radar detection is improved.
Drawings
Fig. 1 is a schematic flowchart of a method for detecting performance of a transmitting device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a first system for detecting performance of a transmitting device according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a second system for detecting performance of a transmitting device according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a third system for detecting performance of a transmitting device according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.
When the driving power and the repetition frequency of the laser of the emitting device are the same, the performance of the emergent light signals emitted by the emitting devices of the same type is approximately the same, but certain inconsistency still exists. When the emergent light signal emitted by the emitting device is used for detection, the pulse width of the emergent light signal influences the distance measurement precision, and the emergent peak power influences the distance measurement capability. Therefore, the emission devices need to be screened, and emission devices with similar performance are screened out; the screened transmitting device is applied to the laser radar, so that the difference among different channels can be effectively reduced, and the detection accuracy of the laser radar can be improved.
Referring to fig. 1, an embodiment of the present invention provides a method for detecting performance of a transmitting device, and referring to fig. 1, the method for detecting performance of a transmitting device includes:
step S110, driving the emission device to be tested to emit an emission light signal by a preset strategy;
step S120, receiving the emergent light signal and acquiring the performance parameters of the emergent light signal;
step S130, screening the emission device to be tested according to the performance parameters of the emergent light signals.
In this embodiment, the preset policy packet preset drive power and preset repetition frequency; the emission devices to be tested are driven by the preset driving power and the preset repetition frequency, all the emission devices to be tested are placed in the same driving environment, the influence of driving environment factors on performance parameters of emergent light signals can be eliminated, and the obtained performance parameters are only related to the performance of the emission devices. The performance of the transmitting device has direct influence on the ranging capability of the laser radar, particularly the performance parameters of the transmitting device such as peak power, pulse width and the like; the peak power can be calculated from the average power, the pulse width, and the repetition frequency, so in this embodiment, under the condition that the repetition frequency is the same, the average power and the pulse width of the outgoing signal need to be obtained according to the received outgoing signal, and the peak power is further calculated. After the peak power is determined, screening the emitting devices according to the peak power and the pulse width, and screening out the emitting devices with similar performance; the screened transmitting device is applied to the laser radar, so that the difference among different channels can be effectively reduced, and the detection accuracy of the laser radar can be improved.
In one embodiment, step S120: receiving the emergent light signal, and acquiring the performance parameters of the emergent light signal, wherein the performance parameters comprise:
dividing the outgoing optical signal into a first laser signal and a second laser signal;
receiving the first laser signal to obtain the pulse width of the emergent light signal, and receiving the second laser signal to obtain the average power of the emergent light signal;
and calculating the peak power of the emergent light signal according to the pulse width and the average power.
It will be appreciated that the average power and pulse width may be obtained by a composite measuring device to which the emitted light signal from the emitting means is directed and measured by the composite measuring device. However, since the system design of the composite measuring device is complex and the cost is high, the embodiment performs the light splitting processing on the emergent light signal, and obtains the average power and the pulse width by using different receiving devices respectively. And the first laser signal and the second laser signal are obtained by performing light splitting processing on the emergent light signal. In some embodiments, the splitting may be performed using a splitting prism, such as a polarizing splitting prism, a polarizing splitting plate, a birefringent prism, a central aperture mirror, or the like.
In this embodiment, the outgoing light signal is divided into a first laser signal and a second laser signal by a light splitting process; then receiving the first laser signal through a photoelectric detector, and obtaining the pulse width of the emergent light signal according to the first laser signal; receiving the second laser signal through a power meter, and obtaining the average power of the emergent light signal according to the second laser signal; further, the peak power is calculated according to the preset repetition frequency and the obtained pulse width and average power, wherein the calculation formula is as follows: peak power = mean power/(repetition frequency pulse width); and finally, screening out the emitting devices with similar performance by utilizing the peak power and the pulse width. Specifically, please refer to fig. 3 and fig. 4, which includes a first detecting unit 220 and a second detecting unit 230; the first detection unit 220 is configured to receive a first laser signal, and determine a pulse width of the to-be-detected transmitting device according to the first laser signal; the second detecting unit 230 is configured to receive the second laser signal and determine an average power of the transmitting device to be tested according to the second laser signal. The first detecting unit 220 may include a photodetector, and receive the first laser signal through the photodetector, and then obtain a pulse width of the emergent light signal according to the first laser signal; the second detecting unit 230 may include a power meter, and receive the second laser signal through the power meter, so as to obtain the average power of the emergent light signal according to the second laser signal.
When the pulse width and the average power of the emitted light signal are measured, only a small part of energy of the emitted light signal can be received due to the higher sensitivity of the photoelectric detector, otherwise, the photoelectric detector is supersaturated; the power meter receives most of the energy of the emergent light signal, and the average power of the second laser signal received by the power meter can be used as the average power of the emergent light signal. In one embodiment, a polarizing beam splitter prism may be used for splitting, which is capable of transmitting P light and deflecting S light. In the outgoing signal that awaits measuring emitter transmission, the percentage of P light is greater than 99%, so most energy (P light) sees through polarization beam splitter prism and becomes the second laser signal to reach the power meter, and the very little partial energy (S light) becomes first laser signal after passing through polarization beam splitter prism deflection, and reach photoelectric detector, can guarantee photoelectric detector supersaturation like this, realize the detection of pulse width, can also guarantee simultaneously that most energy (P light) reach the power meter end through polarization beam splitter prism, realize the detection of average power.
In one embodiment, the dividing the outgoing optical signal into a first laser signal and a second laser signal includes:
the method comprises the steps of utilizing a collimating mirror to collimate emergent light signals emitted by an emission device to be tested, emitting the collimated emergent light signals to a light splitter, and utilizing the light splitter to divide the emergent light signals into a first laser signal and a second laser signal.
In this embodiment, a light emitting point on the emitting device is placed at a focal position of the collimating mirror, a light beam passing through the collimating mirror is a collimated light beam, the collimated light beam is incident on the polarization beam splitter prism, and an emergent light signal is split into a first laser signal and a second laser signal through the light splitting processing of the polarization beam splitter prism. It can be understood that the collimator lens mainly has the function of collimating the emergent light signal, so that the emergent light signal is changed into an almost parallel light beam from a light beam with a divergence angle and is emitted to the optical splitter; the first laser signal and the second laser signal after passing through the optical splitter are also parallel light, so that the receiving is convenient. Moreover, after collimation, the size of the light spot of the emergent light signal can be compressed, so that all the emergent light signals can be transmitted into the optical splitter, and the detected peak power is more accurate. When the emergent light signal is collimated by the collimating mirror, the shape of the emergent light signal is mainly determined according to the sizes of the probe of the power meter and the probe of the photoelectric detector. The collimating lens may be a combination of an aspheric cylinder and a spherical cylinder, or may be a spherical lens (group), or may be a cylindrical lens and a spherical lens (group), and the like.
In one embodiment, the method for detecting the performance of the transmitting device further comprises:
and before the collimated emergent light signal is emitted to the optical splitter, detecting whether the light spot of the collimated emergent light signal reaches the standard by using a diaphragm and a detector.
In this embodiment, the diaphragm is disposed between the collimator and the beam splitter, and the detector is disposed on a side of the diaphragm facing the collimator. If the size of the light spot of the collimated emergent light signal reaches the standard, the emergent light signal can completely reach the light splitter through the diaphragm; if the spot size of the collimated emergent light signal does not reach the standard, part of the spots exceed the diaphragm and fall on a detector, and the detector can generate a corresponding detection electric signal at the moment; when a detection electric signal is generated on the detector, it is indicated that all emergent light signals do not enter the optical splitter, the detection condition is changed to cause inaccuracy, the collimating lens needs to be adjusted, for example, the lens is replaced, and in addition, the distance between the collimating lens and the laser can be adjusted.
In one embodiment, the screening the emission device to be tested according to the performance parameter of the outgoing optical signal includes:
comparing the peak power of the emergent signal with a preset power threshold value, and comparing the pulse width of the emergent signal with a preset pulse width threshold value;
dividing the transmitting devices to be tested, which correspond to the emergent signals, into a first group, wherein the peak power of the emergent signals is greater than the preset power threshold value and the pulse width of the emergent signals is less than the preset pulse width threshold value;
and dividing the corresponding emitting devices to be tested, of which the peak power of the emergent signals is less than or equal to the preset power threshold value, and/or the corresponding emitting devices to be tested, of which the pulse width of the emergent signals is greater than or equal to the preset pulse width threshold value, into a second group.
It can be understood that the pulse width of the emergent light signal affects the ranging accuracy, and the peak power affects the ranging capability. Therefore, emission devices need to be screened according to the peak power and the pulse width of the emergent light signals, and emission devices with similar performance need to be screened out. When screening is performed on each batch of transmitting devices according to the peak power and the pulse width, the following requirements are simultaneously met:
firstly, the pulse width of the transmitting device to be detected is smaller than a preset pulse width value. When the emergent light signal emitted by the emitting device is used for detection, the smaller the pulse width of the emergent light signal is, the higher the precision of distance measurement is, so that in order to ensure the accurate determination of the distance measurement, the pulse width must be controlled within a certain range. For example, the pulse width of the emergent light signal of the emitting device commonly used at present is about 35ns, and the average power is about 55mA, so the pulse width of the emitting device to be tested that is screened out is generally controlled within 36ns to improve the consistency. In this embodiment, the preset pulse width value is 36ns, and the pulse widths of the outgoing signals of the emitting devices in the first group are all smaller than 36ns.
Secondly, the peak power of the transmitting device to be detected is larger than a preset power threshold value. It can be understood that, because the outgoing optical signal emitted by the emitting device is used for detection, the peak power directly affects the ranging capability, and the higher the peak power is, the stronger the ranging capability is. In addition, the transmitting device needs to be adapted to a driving circuit of the laser radar system, and needs to have a minimum peak power Pmin adapted to the driving circuit, so that the minimum peak power Pmin can be selected as a preset power threshold.
In this embodiment, the obtained peak power may be compared with a preset power threshold, and the transmitting device corresponding to the emergent light signal whose peak power is greater than the preset power threshold may be determined, and the transmitting device preliminarily screened may be determined; then comparing the pulse widths of the transmitting devices screened preliminarily with a preset pulse width value, and determining the transmitting devices of which the pulse widths are smaller than the preset pulse width value, thereby determining the transmitting devices of which the peak power of the corresponding emergent signals is larger than the preset power threshold value and the pulse widths are smaller than the preset pulse width threshold value, and classifying the transmitting devices into a first group, so that the transmitting devices in the first group have similar distance measurement precision and distance measurement capability, namely the performance of the transmitting devices in the first group is similar; and the transmitting devices in the first group after screening are applied to the laser radar, so that the difference among different channels can be effectively reduced, and the accuracy of laser radar detection is improved.
In one embodiment, the method for detecting the performance of the transmitting device further comprises: and adjusting the preset power threshold value according to a power adjustment coefficient before comparing the peak power with the preset power threshold value.
It can be understood that, considering the influence of the detection system and environment on the detection result, the detected peak power is greater than the actual/theoretical peak power, so a power adjustment coefficient Q needs to be introduced, and the preset power threshold is adjusted by the power adjustment coefficient Q, thereby improving the accuracy of screening. The power adjustment coefficient Q is related to the divergence angle of the laser in the transmitting device and the receiving aperture of the power meter in the receiving device, for example, the smaller the receiving aperture of the power meter, the larger the power adjustment coefficient Q value, the larger the divergence angle of the laser, the larger the power adjustment coefficient Q value. The adjusted preset power threshold is Q multiplied by Pmin.
In one embodiment, the same power adjustment factor is used for the same type of transmitting device. It can be understood that, when the position relationship among the components is fixed, the influence of the detection system and the environment on the detection result is relatively unchanged; the emitting devices of the same type are defaulted to have the same laser divergence angle, and when the same detection system is adopted to obtain the average power, the caliber of the used power meter is constant, so that the emitting devices of the same type are adjusted by adopting the same power adjustment coefficient, the difference caused by human factors can be eliminated, and the screening accuracy is improved.
In one embodiment, the method for detecting the performance of the transmitting device further comprises:
and before the transmitting device to be detected is driven by the preset power, fixing the transmitting device to be detected on a base of the transmitting device detection system.
The handheld emitting device can be used for testing, but handheld measurement cannot guarantee the consistency of the emergent angle of the emergent light signal and the distance between the emitting device and the detecting device during measurement at each time. Even more, if the photoelectric detector is used for receiving the emergent light signal for measurement, the emergent light signal needs to be deflected by a certain angle to be emitted to the photoelectric detector because the photoelectric detector is sensitive and can not be directly emitted; the handheld transmitting device cannot ensure that the deflection angle measured every time is the same, and the accuracy of the measuring result cannot be ensured.
In order to improve the test consistency and eliminate the influence of human factors, the transmitting device needs to be fixed. Specifically, the accessible sets up the base, before detecting, places the emitter that awaits measuring in the draw-in groove of base, utilizes the draw-in groove is fixed emitter that awaits measuring guarantees that emitter's the emergent light and photoelectric detector's the receiving face maintain fixed angle to and guarantee to await measuring and maintain relatively fixed distance between emitter and the power meter, eliminate the influence of the human factor in the testing process, further improve the accuracy that detects.
In one embodiment, the method for detecting the performance of the transmitting device further comprises:
when the pulse width is judged to be smaller than a preset pulse width threshold value and the peak power is judged to be larger than the preset power threshold value, generating a detection qualified notice for prompting a user that the to-be-detected transmitting device meets the screening requirement, and generating a voice notice of 'passed detection' according to the detection qualified notice; and
and when the pulse width is judged to be larger than or equal to a preset pulse width threshold value and/or the peak power is judged to be smaller than or equal to the preset power threshold value, generating an unqualified detection notification for prompting a user that the to-be-detected transmitting device does not meet the screening requirement, and generating a 'failed detection' voice notification according to the unqualified detection notification.
In this embodiment, judge the pronunciation notice that generates "passing detection" when the emitter that awaits measuring accords with the screening requirement to and judge the pronunciation notice that generates "failing to detect" when the emitter that awaits measuring does not accord with the screening requirement, the staff of being convenient for in time convenient learns the testing result.
Based on the same inventive concept, an embodiment of the present invention provides a system for detecting performance of a transmitting device, please refer to fig. 2, the system for detecting performance of a transmitting device includes a transmitting device 100 to be detected, a detecting module 200 and a comparing module 300.
The emission device 100 to be tested is used for emitting an emission light signal under the driving of a preset power.
The detection module 200 is configured to receive the emergent light signal and obtain a performance parameter of the emergent light signal.
The comparison module 300 is electrically connected to the detection module 200, and is configured to screen the emission device 100 to be detected according to the performance parameter of the emergent light signal.
In this embodiment, the preset policy packet preset driving power and preset repetition frequency; the emission devices to be tested are driven by preset driving power and preset repetition frequency, all the emission devices to be tested are placed in the same driving environment, the influence of driving environment factors on performance parameters of emergent light signals can be eliminated, and the obtained performance parameters are only related to the performance of the emission devices. The performance of the transmitting device has direct influence on the ranging capability of the laser radar, particularly the performance parameters of the transmitting device such as peak power, pulse width and the like; the peak power can be calculated from the average power, the pulse width, and the repetition frequency, so in this embodiment, under the condition that the repetition frequency is the same, the average power and the pulse width of the outgoing signal need to be obtained according to the received outgoing signal, and the peak power is further calculated. After the peak power is determined, screening the emitting devices according to the peak power and the pulse width, and screening out the emitting devices with similar performance; the transmitting device after screening is applied to the laser radar, so that the difference among different channels can be effectively reduced, and the accuracy of laser radar detection is improved.
In addition, by setting the comparison module 300, the peak power of the transmitting device to be detected can be automatically calculated, and the performance of the transmitting device can be quickly judged according to the peak power and the pulse width, so that the screening rate of the transmitting device can be improved.
It will be appreciated that the average power and pulse width may be obtained by a composite measuring device to which the emitted optical signal from the emitting means is directed and measured. However, since the system design of the composite measuring device is complex and the cost is high, the embodiment performs the light splitting processing on the emergent light signal, and obtains the average power and the pulse width by using different receiving devices respectively. Referring to fig. 3 and 4, in one embodiment, the detecting module includes a first detecting unit 220 and a second detecting unit 230; the first detection unit 220 is configured to receive the first laser signal, and determine a pulse width of the to-be-detected transmitting device according to the first laser signal; the second detecting unit 230 is configured to receive the second laser signal, and determine an average power of the transmitting device to be tested according to the second laser signal. In this embodiment, the first detecting unit 220 may include a photodetector, and receive the first laser signal through the photodetector, so as to obtain a pulse width of the emergent light signal according to the first laser signal; the second detecting unit 230 may include a power meter, and receive the second laser signal through the power meter, so as to obtain the average power of the emergent light signal according to the second laser signal.
Based on the design that different receiving devices are used for respectively acquiring the average power and the pulse width, in order to ensure the screening accuracy, the embodiment of the invention performs light splitting processing on the emergent light signal, and divides the emergent light signal into the first laser signal and the second laser signal with the same optical characteristics, so that the influence caused by the fact that the laser signals emitted to different receiving devices have different optical characteristics can be eliminated. Based on this, in one embodiment, the system for detecting performance of the emitting device further includes an optical splitter 700, through which the optical splitter 700 is used to split the emitted optical signal into the first laser signal and the second laser signal.
In one embodiment, the beam splitter 700 includes any one of a polarizing beam splitter prism, a polarizing beam splitter plate, a non-polarizing beam splitter prism, and a mirror with a central aperture. For example, in the performance detection system of the emitting device shown in fig. 3 and fig. 4, a polarization splitting prism is selected as the beam splitter 700, so that most of the energy (P light) penetrates through the polarization splitting prism to reach the power meter end, and a very small part of the energy (S light) is reflected to the photodetector end through the polarization splitting prism, which can ensure that the photodetector is not saturated and the pulse width is detected, and can ensure that most of the energy (P light) reaches the power meter end through the polarization splitting prism to detect the average power. In the performance detection system of the transmitting device shown in fig. 3 and 4, when the mirror with the central aperture is used as the optical splitter 700, a very small part of energy is emitted to the photodetector end through the aperture, and a large part of energy is reflected to the power meter end through the mirror with the central aperture. It can also be seen that the positions of the first detecting unit 220 and the second detecting unit 230 in the reflective plate performance detecting system are not fixed, and the positions of the first detecting unit and the second detecting unit are mainly determined by the selected optical splitter 700.
In one embodiment, the system for detecting the performance of the emitting device further comprises a collimating mirror 800. In this embodiment, the emergent light signal is collimated by the collimator 800. The collimated emergent light signal is changed into an almost parallel light beam from a light beam with a divergence angle and is emitted to the light splitter; the first laser signal and the second laser signal after passing through the optical splitter are parallel light, and the receiving is convenient. Moreover, after collimation, the spot size of the emergent light signals can be compressed, so that all the emergent light signals can be transmitted into the optical splitter, and the detected peak power is more accurate.
In one embodiment, the system for detecting the emitting device further includes a diaphragm (not shown) and a detector (not shown), the diaphragm is located between the collimating mirror and the beam splitter, the detector is disposed on a side of the diaphragm facing the collimating mirror, the diaphragm and the detector are used to determine whether a spot size of the collimated emergent light signal reaches a standard, and when the spot size of the collimated emergent light signal does not reach the standard, the collimating mirror is adjusted, for example, a lens is replaced, and a distance between the collimating mirror and the laser is adjusted, so that the emergent light signal is totally incident on the beam splitter.
In one embodiment, the comparing module 300 is further configured to adjust the preset power threshold according to a power adjustment coefficient before comparing the peak power with the preset power threshold, so that the adjusted preset power threshold is more accurate.
In one embodiment, the power adjustment coefficients of the transmitting devices of the same model are the same.
In one embodiment, the comparison module 300 may be an integrated chip, and one chip is used to implement the data processing and comparison functions. In addition, a power meter can be connected with the photoelectric detector and the computer processor, and screening can be realized by the computer processor and software.
In one embodiment, the system for detecting the performance of the transmitting device further includes a base 400, and a clamping groove is disposed in the base 400 and used for fixing the transmitting device 100 to be detected, so as to eliminate the influence of human factors in the detection process and further improve the accuracy of detection. In this embodiment, the detection module 200, the comparison module 300 and the base 400 are fixed on the testing base; wherein, the base 400 is fixed to the test base by a screw or a pin.
In one embodiment, the system for detecting the performance of the transmitting device further comprises:
an obtaining module 500, configured to obtain identification information of the to-be-detected transmitting device; and
the storage module 600 is electrically connected to the obtaining module 500 and the comparing module 300, and is configured to store the peak power of the to-be-detected transmitting device and the pulse width of the to-be-detected transmitting device according to the identification information of the to-be-detected transmitting device.
It can be understood that a label is generally attached to the surface of the transmitting device, the label includes identification information, and a barcode or a two-dimensional code of the identification information, or the label is a radio frequency card, so that the identification information of the transmitting device to be detected can be directly acquired in a scanning manner. In addition, the obtaining module 500 may also be a human-computer interface, and manually input the identification information of the transmitting device. In addition, by storing the peak power of the transmitting device to be detected and the pulse width of the transmitting device to be detected, the transmitting device which can meet the screening requirement can be checked at any time after the detection is finished, and the qualification rate of the transmitting device is determined.
In one embodiment, the system for detecting the performance of the transmitting device further comprises an audible alarm module 900 electrically connected to the comparison module 300.
The comparison module 300 is further configured to generate a detection disqualification notification for prompting a user that the to-be-detected transmitting device does not meet the screening requirement when it is determined that the pulse width is greater than or equal to a preset pulse width threshold and/or the peak power is less than or equal to the preset power threshold.
The sound alarm module 900 is configured to generate a voice notification of "failed detection" according to the non-detection qualified notification, and generate a voice notification of "passed detection" according to the detection qualified notification, so that a worker can obtain a detection result in time.
To sum up, the embodiment of the present invention provides a method and a system for detecting performance of a transmitting device, wherein the method for detecting performance of the transmitting device includes: driving an emitting device to be tested to emit an emitting light signal by a preset strategy; receiving the emergent light signal and acquiring the performance parameter of the emergent light signal; and screening the emission device to be tested according to the performance parameters of the emergent light signals. The performance of the transmitting device has a direct influence on the range finding capability of the lidar, especially the peak power of the transmitting device. The emission device is driven to emit according to a preset strategy, performance parameters are measured through the emergent light signals, all emission devices to be tested are ensured to be in the same driving environment, and the obtained performance parameters are only related to the performance of the emission device. Screening the launching devices according to the obtained performance parameters, and screening out launching devices with similar performance; the screened transmitting device is applied to the laser radar, so that the difference among different channels can be effectively reduced, and the detection accuracy of the laser radar can be improved.
All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (13)
1. A method for detecting performance of a transmitting device, comprising:
driving an emitting device to be tested to emit an emitting light signal by a preset strategy;
dividing the outgoing optical signal into a first laser signal and a second laser signal;
receiving the first laser signal to obtain the pulse width of the emergent light signal, and receiving the second laser signal to obtain the average power of the emergent light signal;
calculating the peak power of the emergent light signal according to the pulse width and the average power;
comparing the peak power of the emergent light signal with a preset power threshold value, and comparing the pulse width of the emergent light signal with a preset pulse width threshold value;
dividing the transmitting devices to be detected, of which the peak power of the corresponding emergent light signals is greater than the preset power threshold value and the pulse width is less than the preset pulse width threshold value, into a first group;
and dividing the corresponding emission device to be tested, of which the peak power of the emergent light signal is less than or equal to the preset power threshold value, and/or the corresponding emission device to be tested, of which the pulse width of the emergent light signal is greater than or equal to the preset pulse width threshold value, into a second group.
2. The transmission apparatus performance detection method of claim 1, wherein the preset strategy includes a preset driving power and a preset repetition frequency.
3. The method for detecting the performance of a transmitting device as claimed in claim 1, further comprising:
and adjusting the preset power threshold value according to a power adjustment coefficient before comparing the peak power with the preset power threshold value.
4. The method as claimed in claim 3, wherein the same type of the transmitting device under test uses the same power adjustment factor.
5. The method for testing performance of a transmitting device according to claim 3, wherein the average power of the transmitting device under test is measured by a power meter;
the power adjustment coefficient is a parameter related to a reception aperture of the power meter.
6. The method of claim 1, wherein said separating the outgoing optical signal into a first laser signal and a second laser signal comprises:
the emergent light signals emitted by the emission device to be tested are collimated by a collimating mirror, the collimated emergent light signals are emitted to a light splitter, and the light splitter is used for splitting the emergent light signals into the first laser signals and the second laser signals.
7. The method for detecting performance of a transmitting device according to claim 6, wherein before the emitting light signal after being collimated is emitted to a beam splitter, the method further comprises:
and detecting whether the light spots of the collimated emergent light signals reach the standard by using a diaphragm and a detector.
8. The method for detecting the performance of the emitting device according to claim 7, wherein the detecting whether the spot of the collimated emergent light signal meets the standard by using the diaphragm and the detector comprises:
when the detector does not generate a detection electric signal, confirming that the spot size of the collimated emergent light signal reaches a standard;
when the detector generates the detection electric signal, confirming that the spot size of the collimated emergent light signal does not reach the standard, and adjusting the collimating mirror;
the diaphragm is arranged between the collimating mirror and the light splitter, and the detector is arranged on one side, facing the collimating mirror, of the diaphragm.
9. The method of claim 8, wherein adjusting the collimating mirror comprises: and replacing the lens, or adjusting the distance between the collimating lens and the emission device to be tested.
10. The method for testing performance of a transmitting device as claimed in claim 1, further comprising, before driving the transmitting device under test with the predetermined policy:
and fixing the transmitting device to be detected on a base of a transmitting device detection system.
11. A transmitting device performance detection system, comprising:
the transmitting device to be tested is used for transmitting a transmitting light signal under the drive of a preset strategy;
the detection module is used for dividing the emergent light signal into a first laser signal and a second laser signal, receiving the first laser signal to obtain the pulse width of the emergent light signal, and receiving the second laser signal to obtain the average power of the emergent light signal;
the comparison module is electrically connected with the detection module and used for calculating peak power of the emergent light signal according to the pulse width and the average power, comparing the peak power with a preset power threshold value of the emergent light signal, comparing the pulse width of the emergent light signal with a preset pulse width threshold value, and further being used for corresponding the peak power of the emergent light signal is larger than the preset power threshold value and the pulse width is smaller than the preset pulse width threshold value of the emission device to be detected, dividing the emission device to be detected into a first group, corresponding the peak power of the emergent light signal is smaller than or equal to the preset power threshold value of the emission device to be detected, and/or corresponding the pulse width of the emergent light signal is larger than or equal to the preset pulse width threshold value of the emission device to be detected is divided into a second group.
12. The transmitting device performance detection system of claim 11, wherein the detection module comprises:
an optical splitter for splitting the outgoing optical signal into the first laser signal and the second laser signal;
the first detection unit is used for receiving the first laser signal and obtaining the pulse width of the emergent light signal according to the first laser signal;
and the second detection unit is used for receiving the second laser signal and obtaining the average power of the emergent light signal according to the second laser signal.
13. The system for testing the performance of the transmitting device as claimed in claim 11, further comprising a base, wherein a slot is disposed in the base for fixing the transmitting device under test.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010624852.3A CN111880163B (en) | 2020-07-02 | 2020-07-02 | Method and system for detecting performance of transmitting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010624852.3A CN111880163B (en) | 2020-07-02 | 2020-07-02 | Method and system for detecting performance of transmitting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111880163A CN111880163A (en) | 2020-11-03 |
| CN111880163B true CN111880163B (en) | 2023-01-03 |
Family
ID=73149861
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010624852.3A Active CN111880163B (en) | 2020-07-02 | 2020-07-02 | Method and system for detecting performance of transmitting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111880163B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104880659A (en) * | 2015-05-15 | 2015-09-02 | 北京光电技术研究所 | Off-line test method for semiconducting lasers |
| CN207475556U (en) * | 2017-11-23 | 2018-06-08 | 成都嘉纳海威科技有限责任公司 | A kind of multichannel optical module automatic testing equipment based on MCU |
| CN111044141A (en) * | 2019-12-16 | 2020-04-21 | 苏州长光华芯光电技术有限公司 | Laser peak power testing method and device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108132472A (en) * | 2017-12-08 | 2018-06-08 | 上海禾赛光电科技有限公司 | Laser radar system |
-
2020
- 2020-07-02 CN CN202010624852.3A patent/CN111880163B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104880659A (en) * | 2015-05-15 | 2015-09-02 | 北京光电技术研究所 | Off-line test method for semiconducting lasers |
| CN207475556U (en) * | 2017-11-23 | 2018-06-08 | 成都嘉纳海威科技有限责任公司 | A kind of multichannel optical module automatic testing equipment based on MCU |
| CN111044141A (en) * | 2019-12-16 | 2020-04-21 | 苏州长光华芯光电技术有限公司 | Laser peak power testing method and device |
Non-Patent Citations (1)
| Title |
|---|
| 脉冲激光峰值/平均功率测试方法研究;韩刚 等;《计量测试与检定》;20081231;第18卷(第6期);第4-6页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111880163A (en) | 2020-11-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA3017735C (en) | Integrated illumination and detection for lidar based 3-d imaging | |
| EP1607766B1 (en) | Light wave distance measuring method and light wave distance measuring system | |
| US6697206B2 (en) | Tape edge monitoring | |
| US11709228B2 (en) | Laser positioning apparatus and laser positioning method | |
| CA1078170A (en) | Apparatus for testing the refractive power(s) of lenses | |
| CN109387824A (en) | A kind of laser range finder transmitting-receiving plain shaft parallelism measurement method | |
| CN111880163B (en) | Method and system for detecting performance of transmitting device | |
| EP3971606A1 (en) | Radar elevation angle validation | |
| US7764358B2 (en) | Distance measuring system | |
| KR20190116102A (en) | Pulsed-light detection and ranging apparatus, system and method of detection and ranging of an object in a pulsed light detection and ranging system | |
| CN110967280A (en) | Surface wettability detection system and surface wettability detection method | |
| CN110703275A (en) | Laser radar system and object identification method | |
| CN111965623B (en) | Detector detection method and system | |
| CN111830533A (en) | Polarization sensitive laser radar system | |
| US20210080553A1 (en) | Photodetectors and methods and ranging devices and methods | |
| JPH1123710A (en) | Range finder | |
| GB2415310A (en) | Target tracking device for laser designated bombs or rockets | |
| CN112923848A (en) | Correlation type laser size measurement sensor | |
| US20230184911A1 (en) | Method and system for evaluating point cloud quality of lidar, and apparatus | |
| CN110109132A (en) | A kind of light feeds back the laser detection system of main wave signal | |
| CN218886153U (en) | Laser radar device, equipment and system | |
| CN220304798U (en) | Right angle error detection auxiliary device for pentaprism | |
| JP2013181968A (en) | Optical instrument | |
| CN109991614B (en) | Laser radar range unit | |
| JP2743038B2 (en) | Underwater distance measuring device using laser light |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |