Method of simulating generating of large depth field programmable grating

Abstract

The invention discloses a method of simulating generating of large depth field programmable grating. A laser is used to emit a laser beam, and after focusing and collimating of a collimating lens, a collimating Gaussian laser beam capable of satisfying requirements is acquired. After primary specular reflection, the laser beam passes through a circular diaphragm, and is emitted into an MEMS vibration mirror. The laser beam is reflected to a surface of a measured object by the MEMS vibration mirror. Under control of a sinusoidal current signal generated by a driving board, the laser is used for the sinusoidal modulation of the brightness of the laser beam. Under excitation of a driving signal generated by the driving board, the MEMS vibration mirror is used for two-dimensional rotation, and therefore the laser beam is driven to carry out scanning, and grating images are generated. The cycle and the phase of the driving signal of the laser are changed to acquire the grating images of different cycles and different phases. The grating generated by adopting the above mentioned technical scheme has a programmable advantage of a digital grating and a high resolution advantage of a physical grating. The field depth of the generated grating is extended by more than ten times, and therefore a measuring range is greatly improved.

Description

Technical field: [0001] The invention belongs to the field of optical detection, and relates to a method for generating a grating, in particular to a method for generating a programmable analog grating with a large depth of field. Background technique: [0002] As a bridge between the real world and the virtual digital world, 3D measurement technology plays an increasingly important role. It is widely used in many industries such as industrial inspection, medical health, digital entertainment, e-commerce, cultural relics protection, etc. Due to the advantages of non-contact, high precision and fast speed, optical three-dimensional measurement has developed into the most important technology in the field of three-dimensional inspection. Optical three-dimensional measurement can be divided into two types: active and passive. Passive measurement methods are represented by stereo vision. However, the stereoscopic vision technology system is simple in structure and low in cost...

AI Technical Summary

Problems solved by technology

But the disadvantage of physical grating is that the projection pattern is fixed and the use is not flexible

In addition, no matter the analog pattern of digital light projection technology or physical grating projection, it is an image of the film, which is an imaging relationship, so there is a limitation of depth of field

Greatly limits the range of 3D measurements

Images