Laser time-of-flight (TOF) light radar

Abstract

The invention discloses laser time-of-flight (TOF) light radar. The radar includes a transmitting module and a receiving module. The receiving module includes a first photodiode, a second photodiode and a single chip microcomputer. The single chip microcontroller includes a comparator and an analog-to-digital converter. A signal output end of the single chip microcomputer is connected with a signal input end of the transmitting module. The first photodiode and the second photodiode are arranged in parallel. Electrical signals of the first photodiode and the second photodiode are input to the comparator after high-pass filtering. An output end of the comparator is connected with an input end of the analog-to-digital converter after low-pass filtering. The analog-to-digital converter outputsa readable electrical signal. The radar has the advantages that an analog peripheral circuit of the single chip microcomputer is utilized, construction of the laser time-of-flight light radar can berealized simply with a lower efficiency requirement, thus an assembly structure is greatly simplified, and at the same time, volume and costs are reduced.

Description

technical field [0001] The invention relates to a distance measuring device, in particular to a laser time-of-flight light radar. Background technique [0002] There are many ways to measure optical time-of-flight (TOF), and generally involve complex analog circuits to detect the phase difference between the emitted light pulse and the bounced light pulse. This requires a relatively expensive single-chip process or a large number of discrete analog chips to build the system. The other is to use a very high-speed time-to-digital converter (Time-to-Digital converter TDC) to implement a delay-locked loop (delay-locked loop DLL) circuit. In addition, there are also avalanche diode (APD) pulses and high-speed counters to directly accumulate the time difference of reflected light to calculate the object distance. Avalanche diodes and high-speed counters are expensive components and avalanche diodes require high bias voltages (>15V), which require additional charge pumps or bo...

AI Technical Summary

Problems solved by technology

Avalanche diodes and high-speed counters are expensive components and avalanche diodes require high bias voltage (>15V), which requires an additional charge pump or boost circuit

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