Structured light interference velocimeter

Abstract

The invention discloses a structured light interference velocimeter which comprises transmitting equipment, receiving equipment and a reflective composite spiral phase plate. The transmitting equipment is arranged in a measurement site and used for transmitting, receiving and processing optical signals. The receiving equipment is arranged at a remote object to be measured and used for detecting and reversely transmitting the optical signals, and the receiving equipment can adopt Michelson or Mach-Zehnder interference configuration. A beam expander and a beam compressor are adopted in the transmitting equipment and the receiving equipment to adjust the size of a light beam, and collimation transmission of a light field between a near end and a far end is ensured. The reflective composite spiral phase plate is adhered to the surface of an object to be measured and converts irradiated detection light into structured light. Reference Gaussian light and the structured light are combined into superposed light, and the superposed light is detected and subjected to signal processing by using a double-position detection device in the transmitting equipment, so that multi-dimensional movement speed information of translation, rotation or combination of translation and rotation of the remote object to be measured can be obtained. The structured light interference velocimeter has a wide application prospect in the aspects of optical measurement, sensing and the like, and fills the blank in the related technical field.

Description

technical field [0001] The invention belongs to the field of optical measurement, and more specifically relates to a structured light interference velocimeter. Background technique [0002] The traditional laser interferometer based on the classic Doppler effect can use the laser Gaussian beam to measure the translational motion information of the target object, such as the non-contact measurement of the horizontal displacement and linear velocity of the target object, but it cannot measure the target object’s Rotary motion information. At present, the method of obtaining the rotational motion information of the target object generally adopts contact or mechanical measurement, such as an angular velocity sensor based on a gyroscope design, or an angular velocity measuring instrument based on a mechanical gear, but these methods cannot measure the translational motion information of the target object . For compound motions that contain both translational motion information ...

AI Technical Summary

Problems solved by technology

[0002] The traditional laser interferometer based on the classical Doppler effect can use the laser Gaussian beam to measure the translational motion information of the target object, such as non-contact measurement of the horizontal displacement and linear velocity of the target object, but it cannot measure the target object’s Rotary motion information

At present, the method of obtaining the rotational motion information of the target object generally adopts contact or mechanical measurement, such as an angular velocity sensor based on a gyroscope design, or an angular velocity measuring instrument based on a mechanical gear, but these methods cannot measure the translational motion information of the target object

For compound motions that contain both translational motion information and rotational motion information, such as spiral motion, the one-time non-contact simultaneous measurement of both translational and rotational motions cannot be achieved through existing methods

At present, there is no effective method to realize real-time tracking of the trajectory and form of the target object with complex motion. In view of this, it is extremely necessary to design a device for real-time monitoring of compound motion.

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