Ranging method for moving target by using peak time difference among pyroelectric signal peaks

Abstract

The present invention specifically relates to a ranging method for a moving target by using peak time difference among pyroelectric signal peaks, and solves the problem of relatively large error by applying a dual pyroelectric sensor in the ranging field in a conventional technology. The ranging method for the moving target by using the peak time difference among the pyroelectric signal peaks comprises the steps of placing an infrared lens in front of the dual pyroelectric sensor; measuring a time needed by the moving target with a certain speed passing through a detection area; that is the peak time difference of corresponding peaks in a wave shape outputted by the dual pyroelectric sensor when the moving target passes through the detection area; and then obtaining a distance between the moving target and the infrared lens according to semi-field angles of a known dual pyroelectric sensor passing through the infrared lens. The ranging method can measure the distance of the moving target simply, efficiently and passively, suffers relatively small interference from outside influences, has more accurate and reliable distance measurement results, and is low in power consumption, low in cost and simple in realization.

Description

technical field [0001] The invention relates to a distance measuring method, in particular to a distance measuring method for a moving target using the peak-to-peak time difference of pyroelectric signals. Background technique [0002] Infrared pyroelectric detectors have become a research hotspot in the field of infrared detection in recent years. It is widely used in the fields of electronic anti-theft and human body detectors, and is welcomed by users and professionals because of its low price and stable technical performance. Piezoelectric ceramic dielectrics can maintain a polarized state after being electrically polarized, which is called spontaneous polarization. The spontaneous polarization decreases with increasing temperature and drops to zero at the Curie point. Therefore, when the material is exposed to infrared radiation and the temperature rises, the surface charge will decrease, which is equivalent to releasing a part of the charge, so it is called pyroelect...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem in the prior art that the dual-element pyroelectric sensor is applied to the field of distance measurement with relatively large errors, the present invention provides a moving target distance measurement method using the peak-to-peak time difference of the pyroelectric signal

Images