Control system for detecting safety areas by combining infra-red technology and ultrasonic technology

Abstract

The invention discloses a control system for detecting safety areas by combining an infra-red technology and an ultrasonic technology, relating to a safety area detection system which combines an ultrasonic sensing technology and an infra-red sensing technology with computer software and single-chip computer programming control. The control system for detecting safety areas by combining an infra-red technology and an ultrasonic technology comprises a PC microcomputer, a main controller and a sensor, wherein a control circuit of the sensor comprises an ultrasonic transmitting power amplification circuit, an ultrasonic gradient grading collection circuit, a pre-amplification circuit, an A / D conversion circuit, a follow-up grading collection circuit, an infra-red modulation transmitting circuit, an infra-red receiving demodulation circuit, an infra-red / ultrasonic detection judging circuit and an amplification shaping output circuit. The sensor integrated by infra-red sensing control and ultrasonic detection compelled dual-detection has high reliability, enhances the dynamic anti-interference property of an ultrasonic sensor, and completely avoids spurious triggering action caused by the interference of working environment in actual application.

Description

technical field [0001] The invention relates to a system for detection and control of a safety area, in particular to a safety area detection system utilizing ultrasonic sensing technology and infrared sensing technology combined with computer software and single-chip microcomputer programming control. Background technique [0002] At present, there are mainly three types of obstacle detection technologies used in intelligent automatic control locomotives, robots, industrial automation production lines, sports equipment or human body safety area detection systems, infrared light type, laser type and ultrasonic type. Infrared light pattern detection technology, because its detection setting scale is an approximate value, it cannot accurately locate and realize hierarchical control. At the same time, affected by the intensity of ambient light, the reflection distance detection error of reflective objects with different light absorption rates is very large, at 200%. Therefore, ...

AI Technical Summary

Problems solved by technology

Infrared light pattern detection technology, because its detection setting scale is an approximate value, it cannot accurately locate and realize hierarchical control. At the same time, affected by the intensity of ambient light, the reflection distance detection error of reflective objects with different light absorption rates is very large, at 200%. Therefore, it is not suitable for use in situations where the detection conditions change dynamically and the determination requirements are high.

Laser type detection technology, high detection accuracy, strong anti-interference, can easily use programming to realize different forms of area setting or self-learning area setting, but its detection surface is only a thin fan-shaped surface with a vertical thickness of about 1cm , obstacles in the adjacent upper and lower areas other than the fan-shaped surface cannot be detected, resulting in the detection of obstacles that may appear outside the scanning vertical direction within the range of detection distance, and the effect of comprehensive protection cannot be achieved

Ultrasonic shape detection technology, because its sensor emits mechanical vibration waves, it cannot jump, and there is diffraction interference of short-distance transverse secondary waves. Therefore, the existing ultrasonic technology products adopt the short-distance interruption processing method, resulting in the presence of at least 30cm Short-range detection interruption blind area; in addition, ultrasonic technology also has echo diffraction interference between laterally adjacent objects, response delay of control output, cannot respond effectively to fast lateral cutting obstacles, and does not have the function of arbitrarily selecting and setting the measurement and control distance according to needs And the system configuration integration function of programming and hierarchical output control, and there are many shortcomings such as the length limit of the transmission line between the ultrasonic sensor and the ultrasonic control host.

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