Laser distance measuring system and distance measuring control method thereof

Abstract

The invention discloses a laser distance measuring system. Impulse given off by a singlechip of the system is transmitted to a laser driver, the laser driver transmits the impulse to a laser diode and emits laser through emitting lens, the emitting lens reflect part laser to the light receiving end of a light-electric-light converting circuit, then the signals are emitted to a PIN tube through the light emitting end of the light-electric-light converting circuit, the PIN tube receives lasers, which is reflected by barriers, through receiving lens at the same time, the PIN tube transmits the laser signals to a time-digital converter through an amplifying filter circuit, and the time-digital converter transmits the time signal to the single chip. The delay between the laser diode of the laser distance measuring system receiving the emitting laser and emitting laser is capable of being precisely marked through a light-electric-light converter circuit; therefore a more accurate start-time is obtained. Furthermore, the system has a simple design and a small volume, which is convenient to integrate with other systems.

Description

technical field [0001] The invention relates to the field of automobile active safety, in particular to a laser ranging system. Background technique [0002] At present, laser ranging technology has been widely used in the field of automotive active safety. Among various ranging methods, pulsed laser ranging has the advantages of simple structure, long range and fast measurement speed, and has been widely used in many fields. The pulse laser ranging system transmits a light pulse to the target, which is reflected by the target and received by the receiving circuit of the ranging system. The distance between the target and the target can be obtained by measuring the time from the emission of the light pulse to the return to the receiving circuit. For the calibration of the launch time, the traditional methods include optical methods and electrical connection methods. [0003] The optical method is to use optical instruments to simultaneously collect part of the light to the...

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Problems solved by technology

[0003] The optical method is to use optical instruments to simultaneously collect part of the light to the photodetector at the same time as the laser emits. This method of directly transmitting part of the emitted light to the photodetector requires more complex optical instruments and larger volumes;

[0004] The method of using electrical connection is to send the driving signal directly to the time measurement unit while the laser is emitting. The disadvantage of this method is the delay between the moment when the laser emitter receives the pulse command and actually emits the laser pulse. is temperature dependent and cannot be determined

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