Self-energy-obtaining dynamic and static human body detector and micropower low-false-positive and low-false-negative method

Abstract

The invention discloses a self-energy-obtaining dynamic and static human body detector and a micropower low-false-positive and low-false-negative method. The human body detector comprises a monitoring detector body and an environment detector body, and the structure of the monitoring detector body and the structure of the environment detector body are similar; the monitoring detector body comprises a Fresnel lens, a pyroelectric infrared sensor, a signal modulation module, a bistable liquid crystal light valve executing module and a signal collecting, processing, communication, control and self-energy-obtaining module. The pyroelectric infrared sensor sleeved with the Fresnel lens is sequentially connected with the signal modulation module, the signal collecting, processing, communication, control and self-energy-obtaining module and the bistable liquid crystal light valve executing module. A self-energy-obtaining technology overcomes defects of battery / wired power supply, and by means of bright and dark conversion of a liquid crystal light valve, service objects of the human body detector are extended to static people. A differential data algorithm that environment interference is removed from signals of the monitoring detector body through medium-station filtering and by means of the environment detector body enables the false positive rate and the false negative rate to be reduced, and application of micropower improves usability of the human body detector.

Description

technical field [0001] The invention relates to the technical field of human body detection of a passive pyroelectric infrared detector, in particular to a self-capturing dynamic and static human body detector and a method for false alarms and false alarms with low power consumption. Background technique [0002] Passive pyroelectric infrared sensor is a pyroelectric infrared detection sensitive element based on pyroelectric effect. It is widely used in industry, agriculture, national defense and security and other fields, even in common household appliances. Any object except the black body radiates infrared rays outward, and its wavelength obeys Wien's Displacement Law; the typical human body temperature is 37°C, which is a good infrared source, as long as it can detect the infrared rays of the human body, it can be obtained the state of human activity. Since Germany made the world's first infrared sensor with lead sulfide material during World War II, the infrared techno...

AI Technical Summary

Problems solved by technology

[0004] Three deficiencies have been exposed during the application of passive pyroelectric infrared detectors: First, passive pyroelectric infrared detectors are only effective for dynamic human bodies, that is, they cannot detect static or slow-moving human bodies; if the detectors are used for security, there are Hidden dangers in safety; if it is used for energy saving, there are technical shortcomings according to whether someone decides to switch on and off the lighting and heating (cold); the development of detectors suitable for dynamic and static human bodies is directly restricted by the mechanism of pyroelectric effect

Second, the battery / wired power supply method of passive pyroelectric infrared detectors needs to be improved: the operation and maintenance workload and overhead of battery power supply are too large; the wiring and maintenance workload of wired power supply is large, and the construction of passive pyroelectric infrared detectors security systems lack scalability and flexibility

Third, pyroelectric infrared sensors are susceptible to interference from other infrared sources in the environment, such as heating and air conditioning that may cause false alarms on the detector. Reducing or eliminating false alarms is an urgent problem to be solved

EnOcean has laid a solid foundation for the revolution of the power supply method of passive pyroelectric infrared detectors. Since the EnOcean self-energy harvesting solution does not consider the special requirements of security for high availability, it is unwise to directly apply the EnOcean self-energy harvesting solution

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