Counting device, counting method and infrared detection system

Abstract

The invention provides a counting device, a counting method and an infrared detection system. The counting method includes the following steps: the pulse signals of passive infrared sensors are fused, so that a fused signal is obtained; when the pulse signal of the first passive infrared sensor is received in the fused signal, a timer is started, and a dynamic data frame is constructed; according to the set time length of the timer, whether the construction of the dynamic data frame is finished is determined; when the construction of the dynamic data frame is finished, according to a decision rule, the judgment of the moving directions and number of detected targets is carried out on the dynamic data frame, and thereby accurate counting is realized by using the passive infrared sensors.

Description

technical field [0001] The invention relates to the field of infrared detection, in particular to a counting device, method and infrared detection system. Background technique [0002] With the development of science and technology, infrared detection technology is widely used in communication, military, aerospace, medical, detection and other scientific fields, such as infrared automatic hand dryer, infrared alarm, infrared temperature measurement, infrared counting and so on. [0003] Active infrared detection method and passive infrared detection method are two main detection methods of infrared detection technology. The active infrared detection device is composed of an active infrared transmitter and an active infrared receiver. When the infrared beam between the transmitter and the receiver is completely blocked or blocked by a given percentage, a trigger signal can be generated. The passive infrared detection device works by detecting the infrared rays released by th...

AI Technical Summary

Problems solved by technology

[0005] However, the active infrared counting device has the following problems: when the active infrared is working, it needs to continuously emit infrared rays to the outside world, resulting in high power consumption, and it cannot be powered by a battery when counting applications; When counting the measured object, the transmitter and receiver must be installed on both sides of the measured object, which is inconvenient to install and limits the wide application of active infrared

However, due to the shortcomings of passive infrared sensors that are easily interfered by various heat sources, poor penetration, and susceptible to radio frequency radiation interference, the application of passive infrared sensors in the field of counting is limited.

At present, passive infrared sensors are mainly used to detect whether there is no one or whether there are other animals and objects that can emit infrared rays passing around the sensor, but cannot accurately count the number of individuals

[0007] Therefore, under the existing technical conditions, the use of passive infrared sensors with low power consumption, small size, and low price cannot achieve more accurate counting of the measured objects.

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