Method and structure for identifying static human body and moving human body at sametime by thermo electrical detector

Abstract

The invention supplies the method and structure used rotating type pyroelectric detector to identify static and motive human body. The method includes the following steps: connecting the electric machine with the pyroelectric detector, making the pyroelectric detector form relative velocity difference with the static human body or motive one by forward and backward alternating turning the electric machine. Thus the pyroelectric detector of the invention can identify static and motive human body, meanwhile enlarge detector monitoring range, and improve the defect that the detector is not sensitive to the radial motive human body. The invention can be widely used in electric theft-proof, human body detecting, safety auto protecting control field etc, and supply a brand new application visual angle for lithium tantalite pyroelectric detector.

Description

Technical field: [0001] The invention relates to the technical field of electrical safety automatic protection control, in particular to a rotary pyroelectric detector capable of simultaneously identifying stationary and moving human bodies. Background technique: [0002] A pyroelectric detector is generally composed of a pyroelectric sensor, a sensing signal processing integrated circuit and a Fresnel lens. [0003] Pyroelectric sensors are temperature-sensitive sensors that use temperature changes to cause crystal surface charging phenomena, that is, pyroelectric effects. It is composed of ceramic oxide or piezoelectric crystal elements, and two electrodes are made on the surface of the element in the sensor window. When the moving human body enters the sensor monitoring range, it will bring about temperature changes, and the pyroelectric effect will be on the two electrodes. It will generate unequal charges, that is, a weak voltage will be generated between the two elect...

AI Technical Summary

Problems solved by technology

[0005] In practical applications, pyroelectric detectors are fixedly installed on indoor walls, ceilings, etc., and both the pyroelectric detectors and the internal pyroelectric sensors are stationary during work, and the monitoring range is also controlled by the sensor and Fresnel. Determined by the characteristics of the ear lens, this traditional application method determines the application effect of the current pyroelectric detectors that can only monitor the active human body and output the active human body signal.

Images