Device for suppressing speckle effect by using partial-wave surface shifting in triangular ranging linear focal imaging

Abstract

The invention belongs to the field of laser range finding, and discloses a device for suppressing a speckle effect by using partial-wave surface shifting in triangular ranging point linear imaging. The device comprises a transmitting unit and a receiving unit, wherein the transmitting unit comprises a laser, a focusing lens group and a cylindrical lens. A measured object is disposed below the cylindrical lens. A one-dimensional glass sheet array and a receiving lens group in the receiving unit are disposed between a photoelectric image detector and the measured object, and the scattered lightemitted by the measured object is shifted by a partial-wave surface of the one-dimensional glass sheet array to form a plurality of linear focal spot images which are received by the photoelectric image detector. The one-dimensional glass sheet array is disposed between the photoelectric image detector and the measured object, so the device can perform the shifting of the scattered light emitted by the measured object to form the plurality of linear focal spot images, and the device performs the range finding through solving a mean value, effectively reduces the measurement uncertainty in laser range finding via an averaging method, does not sacrifice the lateral resolution of a measurement device, and is better in application prospect.

Description

technical field [0001] The invention belongs to the field of laser ranging, and more specifically relates to a device for suppressing speckle effect by using sub-wave plane image shifting in line-focus imaging of triangular ranging. Background technique [0002] Laser ranging is a high-precision non-contact distance measurement method. The laser triangulation method uses the principle of laser triangulation to calculate the distance of the measured object through the triangle formed by the incident light and scattered light. [0003] In the laser triangulation method, the speckle effect of the laser limits the measurement accuracy of this method. The speckle effect of the laser means that when the laser is irradiated on the rough surface, due to the phase difference introduced by the surface elements of the rough surface, the scattered light superimposes and interferes in space, forming a random light intensity distribution, which makes the laser ranging method There is unc...

AI Technical Summary

Problems solved by technology

However, excessively extending the length of the focal spot of the line will limit the surface shape of the measured object, resulting in a narrow application range of the device, which does not have a good application prospect

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