Implementation method of laser range-gated imaging high-pulse-width-precision pulse generator

Abstract

The invention discloses an implementation method of a laser range-gated imaging high-pulse-width-precision pulse generator. The implementation method comprises the steps that frequency doubling is carried out on clock signals, and the clock signals are divided into two paths of signals; with the obtained multiple paths of clock signals with different phases as triggering clock signals, multiple paths of signals with relative time delay are output; the pulse width of the different delayed signals is increased, and signals with the pulse width increased are output; one part of the signals are input into a selector, and two paths of signals are selected to be output; the other part of the signals are input into the selector, and two paths of signals are selected to be output; phase OR is carried out on the two paths of output signals through a logic OR gate, so that high-pulse-width-precision TTL signals are obtained and output; phase OR is carried out on the output signals through the logic OR gate, so that high-pulse-width-precision TTL signals with relative time relay are obtained and output. According to the implementation method, phase OR is carried out on the TTL triggering signals obtained after digital phase-shifting so as to obtain the TTL signals with pulse width precision higher than global clock precision, and therefore high-precision sequence signals can be provided for the laser range-gated imaging field.

Description

technical field [0001] The invention relates to the technical field of laser range gating imaging, in particular to a method for improving pulse width control precision based on digital phase shifting. Background technique [0002] The basis of realizing laser range-gated imaging is to control the pulsed laser and the gate to work synchronously. By controlling the relative delay between the laser pulse and the gating pulse, the gating gate is only opened when the reflected light of the target reaches the gating gate, and the light intensity information containing the target information is recorded, and the gating gate is closed during the light flight time. Record light intensity information. In this way, noises such as scattered light and background light in the light time of flight are avoided from deteriorating the imaging quality, and the detection distance and precision of laser imaging are improved. [0003] The relative delay between the pulsed laser and the gate is...

AI Technical Summary

Problems solved by technology

Patent CN102170277A adopts FPGA and delay line to jointly realize the TTL signal with picosecond precision and narrow pulse width to trigger the pulse laser and gate to complete the synchronous control in range gating imaging, because the delay line delay of fixed length is fixed Yes, if you want to realize multiple signals with different pulse widths, you need to use multiple delay lines of different lengths to delay and phase-shift the signals, which means that the synchronous control system is not easy to operate and the volume will be huge, which is not conducive to distance selection. Integration and productization of the control system of communication imaging

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