Pyroelectric sensor

A pyroelectric sensor and pyroelectric technology, applied in the direction of instruments, scientific instruments, measuring devices, etc., can solve the problems of false alarms or even non-reports, low reliability, poor stability, etc., so as to improve the service life and detection The effect of measuring the effect

Inactive Publication Date: 2016-12-14
周红林
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The optical filter is the Nephil lens. There is currently a problem. Most of the traditional human body sensors use a single-head Fresnel lens, which is prone to false alarms or even no reporting, poor stability, and low reliability.

Method used

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Embodiment Construction

[0016] The specific implementation manners of the present invention will be further described below in conjunction with the accompanying drawings, so as to make the technical solution of the present invention easier to understand and grasp.

[0017] refer to figure 1 As shown, a pyroelectric sensor includes a housing 100 and a pyroelectric element 200. When the pyroelectric element 200 detects a biological heat source, it outputs a human signal. The housing 100 is provided with at least 3 groups of Fresnel The optical axes of the lens 210 and the Fresnel lens 210 intersect at the intersection of the optical axes, and the optical axis is the straight line where the line connecting the center point of the Fresnel lens 210 and the light spot is located. By setting in this way, the response accuracy is improved, and the use environment and service life are guaranteed. The shape of the Fresnel lens 210 is arc. Through the arc setting, the viewing angle range is improved. The Fre...

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Abstract

The invention relates to a pyroelectric sensor comprising a housing and a pyroelectric member. When the pyroelectric member detects a biont heat source, a human signal is output. The housing is provided with at least three sets of Fresnel Lenses, the optical axes of the Fresnel Lenses intersect at an optical axis intersection point, and each optical axis is a straight line where the line connecting the central point of the Fresnel Lens and the light spot is arranged. The detection precision is improved and the dead zone problem is solved, the service life is prolonged, and the detecting effect is enhanced.

Description

technical field [0001] The invention relates to a human body detection sensor, in particular to a pyroelectric sensor. Background technique [0002] In the pyroelectric sensor, the main function of the optical filter is to only allow infrared rays with a wavelength of about 10 μm (infrared wavelengths emitted by the human body) to pass through, while filtering out lights, sunlight and other radiation to suppress external interference. The infrared induction source usually consists of two pyroelectric elements connected in series or in parallel. The electrodes of the two pyroelectric elements are opposite. The electrical effects cancel each other out, and the output signal is close to zero. Once someone intrudes into the detection area, the infrared radiation of the human body is focused through part of the mirror and received by the pyroelectric element. Due to the different angles, the heat received by the two pyroelectric elements is different, and the pyroelectric energy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J5/08
CPCG01J5/08
Inventor 周红林
Owner 周红林
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