Laser ranging device and signal adjusting method and signal adjusting circuit thereof
A laser signal and signal adjustment technology, which is applied in the field of signal adjustment circuits and laser distance measuring devices, can solve the problems of low stability of reflected laser signals, limited signal adjustment range, single signal adjustment method, etc.
Pending Publication Date: 2021-05-07
RESEARCH INSTITUTE OF TSINGHUA UNIVERSITY IN SHENZHEN +1
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Problems solved by technology
[0005] The purpose of this application is to provide a laser distance measuring device and its signal adjustment method and signal adjustment circuit, aiming to solve the problem of single signal adjustment method and limited signal adjustment range in the traditional laser distance measuring device adjustment method, which leads to reflection The problem of low laser signal stability and shortened laser working life
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[0031] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application.
[0032] It should be noted that when an element is referred to as being “fixed” or “disposed on” another element, it may be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.
[0033] It is to be understood that the terms "length", "width", "top", "bottom", "front", "rear", "left", "right", "vertical", "horizontal", "top" , "bottom", "inner", "outer" and oth...
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The invention discloses a laser ranging device and a signal conditioning method and circuit thereof, and the signal conditioning circuit achieves the collection of the intensity of a reflected laser signal outputted by a photoelectric receiver through employing a signal intensity feedback circuit, a control circuit, a luminous intensity adjusting circuit and a photoelectric conversion gain adjusting circuit. And when the intensity of the reflected laser signal is out of the preset signal intensity range, the working current of the laser is adjusted according to the difference between the intensity of the reflected laser signal and the maximum value or the minimum value of the preset signal intensity range so as to control the intensity of emitted light of the laser. And / or the bias voltage of the photoelectric receiver is adjusted to control the photoelectric conversion gain of the reflected laser signal, so that negative feedback cooperative control is implemented on the emitted light intensity of the laser and the photoelectric gain of the photoelectric receiver to obtain the reflected laser signal with stable intensity.
Description
technical field [0001] The application belongs to the technical field of laser distance measurement, and in particular relates to a laser distance measurement device, a signal adjustment method and a signal adjustment circuit thereof. Background technique [0002] Phase-type laser ranging is to measure the phase change of the continuously emitted modulated laser signal, and calculate the round-trip time of the laser based on this to obtain distance information. For phase laser ranging, it is necessary to demodulate the phase of the laser signal reflected from the surface of the measured target. Obtaining a stable reflected laser signal is very important for high-quality phase demodulation and distance measurement. In mobile application scenarios, real-time changes in the light intensity of the external environment (such as entering a tunnel from an open-air road, direct sunlight, etc.), and real-time changes in the contact position between the laser and the surface of the me...
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IPC IPC(8): G01S17/08G01S7/481G01S7/483
CPCG01S7/481G01S7/483G01S17/08
Inventor 敬刚吴梓荣刘岩胡益民
Owner RESEARCH INSTITUTE OF TSINGHUA UNIVERSITY IN SHENZHEN