Wiring method of infrared counterpoise

Active infrared receiver in the photoelectric sensor is usually used photodiodes, phototransistors, silicon photocells, silicon avalanche diodes, etc., according to GBl0408.4-2000 "Intrusion Detectors Part 4: Active Infrared Countermeasures Intrusion Detectors," which provides that: "Detectors in the manufacturer's specified detection distance When working.

Radiation signal is completely or by a given percentage of shading duration greater than 40ms, the detector should produce an alarm state." It is different parts of the use can be set (adjusted) different minimum shading time, which is beneficial to reduce the false alarm of the system.

Active infrared convection transmitter issued by the infrared beam dispersion angle, in the GBl0408.4-2000 standard: "indoor use, the transmitter and receiver by the correct installation and alignment.

And work in the manufacturer's specified detection distance, 75% of the radiant energy. The receiver should not produce an alarm condition when persistently shielded." For outdoor use the sensitivity of the infrared beam is reduced by temperature and sunlight. To minimize the resulting false alarms, the installation should be used so that the transmitter and receiver axes coincide.

Expanded Information:

Active Infrared Intrusion Detectors p>Active infrared intrusion detector to choose the appropriate trigger response time: response time is too short to cause unnecessary interference, such as birds flying over, falling leaves, etc. triggered false alarms; too long is easy to form a missed alarm. National standard GB10408.4--2000 active infrared intrusion detector provides ≥ 40ms for the alarm trigger time.

It is in view of the traditional active infrared intrusion detector is usually installed in the traditional molding wall application conditions. And for the installation of the ground application conditions, it is necessary to run the highest speed of personnel 10m / s, to determine the shortest blackout time.

If the width of the person is 20cm, the shortest blocking time of 20ms. ≥ 20ms blocking for the triggering of the alarm, the national standard GB10408.4--2000 active infrared intrusion detector provisions ≤ 20ms shall not alarm.

Baidu Encyclopedia-Infrared Countermeasures