Pyroelectric sensor, pyroelectric detecting device of human body in motion and detecting method thereof
A pyroelectric sensor and pyroelectric technology, applied in the field of detection, can solve the problems of insufficient indoor environment detection, high false alarm rate of human body detection, and short detection distance, so as to facilitate repeated detection, avoid top-cutting distortion, The effect of increasing the detection distance
Active Publication Date: 2013-09-25
CHENGDU SIWI HIGH TECH IND GARDEN
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Problems solved by technology
[0004] 1. The detection distance is too short, generally less than 7m, which cannot satisfy the detection of indoor environment
[0005] 2. Due to the long blocking time and low frequency of repeated detection, it is not conducive to rapid secondary detection, which may easily lead to missed alarms
[0006] 3. The false alarm rate of human body detection in motion is too high
[0007] 4. Since the height of the robot body is not high, the installation position of the sensor is relatively low, which is easy to trigger by mistake
Method used
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Embodiment Construction
[0031] The pyroelectric sensor involved in the present invention comprises the following units:
[0032] 1. Pyroelectric probe: After receiving the thermal signal of the human body, the released charge will cause a change in the current in the circuit. In addition, a Fresnel lens is added to the front of the probe to improve its sensitivity.
[0033] 2. Voltage divider circuit unit: the input end is connected to the pyroelectric probe unit to play the role of voltage divider. As the loop current changes, the resistor voltage changes, and proper resistor selection will select a suitable voltage signal that varies significantly.
[0034] 3. Pre-stage filter circuit: the output terminal is connected to the input terminal of the first-stage amplifier circuit. In order to minimize the noise entering the input terminal of the amplifier, a decoupling capacitor is used to filter out part of the high-frequency noise. Here, an RC low-pass filter is used.
[0035] 4. First-level a...
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The invention provides a pyroelectric sensor, a pyroelectric detecting device of a human body in motion and a detecting method thereof. The pyroelectric sensor comprises a pyroelectric probe, a divider circuit, a fore filter circuit, a primary amplifying circuit unit, a primary amplifying circuit, a secondary amplifying circuit, a back filter circuit, and a dual voltage comparator circuit. The pyroelectric detecting device of the human body in motion comprises a signal processing unit and three pyroelectric sensors which are installed in a circle. According to the detecting method, through twice detection of a TTL signal of the pyroelectric sensor, the determination of an alarm state direction is carried out, and a report is sent to a host computer. According to the pyroelectric sensor, the pyroelectric detecting device and the detecting method, a detecting distance is long, the 360-degree detection without a blind area can be carried out, the rate of false alarm and missed alarm is low, and the sensor, the device and the method are suitable for a mobile security robot.
Description
technical field [0001] The invention belongs to the technical field of detection, and in particular relates to a pyroelectric sensor, a human body pyroelectric detection device in motion and a detection method. Background technique [0002] Pyroelectric sensors detect changes in the infrared energy radiated by the human body in a non-contact manner, and are widely used in automatic doors, monitoring, energy-saving lamp control, field monitoring and other scenarios, but these applications are all scenarios where the sensor is fixed and the human body moves. There are few technologies that detect motion in the sensor for the human body. [0003] Indoor mobile security robots are required to detect indoors without blind spots and with high sensitivity during both stationary and moving processes, and report and make alarms within a short period of time, while the requirements for false alarms and missed alarms are very low. However, if many traditional pyroelectric sensors or i...
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IPC IPC(8): G01J5/10
Inventor 包壁祯肖骥陈建华李一明何敏
Owner CHENGDU SIWI HIGH TECH IND GARDEN