Photoelectric detector flight time correction system and method
A photoelectric detector and time-of-flight technology, applied in the field of optical distance measurement, can solve the problems of signal amplitude and slope changes, time-wandering errors, etc.
Active Publication Date: 2020-10-27
THE 44TH INST OF CHINA ELECTRONICS TECH GROUP CORP
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Problems solved by technology
[0004] The technical problem to be solved by the present invention is to provide a photodetector time-of-flight correction system and method to solve the time wandering caused by the change of signal amplitude and slope and the change of circuit characteristics after the signal is saturated when the pulse method is used to measure the time-of-flight error
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[0024] The present invention will be further described below in conjunction with the accompanying drawings.
[0025] In the description of the present invention, unless otherwise specified and limited, it should be noted that the term "connection" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be the internal communication of two elements, it can be Directly connected or indirectly connected through an intermediary, those skilled in the art can understand the specific meanings of the above terms according to specific situations.
[0026] like figure 1 As shown, it is a system structure diagram of a preferred embodiment of a photodetector time-of-flight correction system of the present invention, including a signal source 1, a laser 2, an optical attenuator 3, a test system 4 and an oscilloscope 5 connected in sequence. The signal source 1 generates a pulse signal to drive the laser 2 to emit laser l...
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The invention discloses a photoelectric detector flight time correction system and method. The systemcomprises a signal source, a laser, an optical attenuator and a test system which are connected insequence, wherein the signal source acts on the laser to drive the laser to emit laser; the optical attenuator is used for adjusting an optical signal input into the test system; the test system is used for correcting and outputting flight time. A synchronizing signal of a signal source, an analog signal of a detector module and a digital signal of a time discrimination module are respectively accessed to a first channel, a second channel and a third channel of an oscilloscope, theoptical attenuator is adjusted, a first time interval and a pulse width corresponding to the plurality of analog signal amplitudes are recorded,data fitting is carried out on the multiple groups of data according to a fitting correction model, and corrected flight time is corrected and outputted so as to solve the problem of moment migration errors caused by signal amplitude and slope changes and circuit characteristic changes after signal saturation under a fixed threshold.
Description
technical field [0001] The invention relates to the technical field of optical ranging, in particular to a photodetector time-of-flight correction system and method. Background technique [0002] Laser ranging measures the flight time of the laser to the target and uses the constant of the speed of light to calculate the target distance. It has the advantages of long range, fast speed, and strong anti-interference. It is widely used in military, aerospace, surveying and mapping, transportation, and 3D imaging. field. [0003] There are usually phase method and pulse method to measure the flight time of laser. The pulse method is widely used because of its simple system and long action distance. Its principle is to directly identify the time of the main wave signal and the echo signal, and then measure the two times time interval. However, the disadvantage of the pulse method is that the accuracy is easily affected by the time discrimination, that is, the echo signals with ...
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IPC IPC(8): G01S17/32G01S7/4861G01S7/4865
CPCG01S17/32G01S7/4861G01S7/4865Y02P70/50
Inventor 冉建亓林张兴曹飞谭千里张建华
Owner THE 44TH INST OF CHINA ELECTRONICS TECH GROUP CORP