Light curtain detection device without dedicated sync cable, and method therefor

Abstract

The invention discloses a light curtain detection device without a dedicated sync cable, and a method therefor. The interior of a light curtain transmitter in the device is provided with infrared transmitting tubes, and the interior of a light curtain receiver is provided with receiving tubes, wherein the infrared transmitting tubes are corresponding to the receiving tubes in a one-to-one manner. A clock frequency dividing module is connected with a reference data generation module and a light pulse generation module comprising a sync code. The reference data generation module is connected with the light pulse generation module comprising a synchronous code. A phase locking ring module is connected with a frame synchronization module, and the frame synchronization module is connected with an in-place detection module and a multi-channel switch control module. According to the invention, a frame synchronization code which is reliable in capturing and strong in capacity of resisting disturbance is added before a first light pulse of the transmitter, and the light curtain receivers sequentially carry out serial working through employing a quick phase locking ring algorithm with a quick bit synchronization speed, and 16 light pulses. The device employs the characteristics of parallel processing of an FPGA to achieve the real-time in-place detection of a high-speed movement object.

Description

technical field [0001] The invention relates to the field of optical computer equipment, in particular to a light curtain detection device without a dedicated synchronization line and a method thereof. Background technique [0002] The light curtain is a synchronous opposite-beam detection device with a row of infrared emitting tubes and light receiving tubes installed from top to bottom. The ordinary light curtain is composed of a transmitter, a receiver and a special synchronous cable connected to the transmitting and receiving part. The transmitter drives an infrared tube to emit a beam of infrared rays at a certain interval along the length direction to generate AC infrared light pulses. The receiver follows the same interval Arrange the same number of light receiving tubes. When working, first an infrared emitting tube emits a light pulse and the corresponding light receiving tube searches for the pulse at the same time. When it is found, it completes the scanning of o...

AI Technical Summary

Problems solved by technology

[0010] Aiming at the problems existing in the prior art, the present invention provides a method that can overcome the problems that the synchronization cable between the ordinary light curtain transmitter and receiver is easy to break and is susceptible to electromagnetic interference, etc., and has fast response speed, strong anti-interference ability and convenient upgrade. , It can be used in various industrial harsh environments, and it can realize in-position detection of high-speed moving objects. A light curtain detection device without a dedicated synchronization line and its method

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