Infrared detector operation method

(1) Adjusting the optical axis of the emitter to open the cover of the probe, aiming the eye at the sight and observing the influence inside the sight. The optical lens of the probe can be adjusted directly by hand in the range of 180°, and the lower and lower sides of the lens are adjusted with a screwdriver. Adjusting the screw, the lens system has an adjustment range of 12° up and down, and repeated adjustments cause the influence of the opposing detector in the sight to fall into the center position. Be careful not to cover the optical axis during the adjustment process, so as not to affect the adjustment work. The adjustment of the optical axis of the emitter has a great influence on the sensitivity performance of the zone. Please be sure to repeat the adjustment according to the correct steps.

(2) Optical axis adjustment of the light receiver. First step: The optical axis of the light receiver is initially adjusted according to the same method as the optical axis adjustment of the light projector. At this time, the red warning light on the receiver is off, the green indicator light is on, and there is no flicker, indicating that the optical axis of the ferrule is coincident, and the emitter and receiver are functioning normally.

Step 2: There are two small holes on the light receiver, which are marked with + and - respectively, to test the intensity of the infrared light perceived by the light receiver. The value is expressed by voltage, which is called the light voltage. Insert the test chart (red +, black -) of the multimeter into the light-receiving voltage of the measuring receiver. Adjust the lens system repeatedly to maximize the value of the light. In this way, the working state of the probe reaches the state of good.

Note: The four-beam detector has two sets of optical systems. It is necessary to cover the upper and lower lenses of the receiver separately and adjust until the upper and lower photosensitive voltage values ​​are the same. The two sets of optical systems of the older four-beam detectors are separately adjusted. Because of the corresponding relationship between the four optical systems of the transmitter and the receiver, the adjustment is quite difficult and requires special adjustment. If not handled properly, it will be handled improperly. A false positive has occurred or a dead zone has been protected. The ABF four-beam detector has integrated the two parts into one unit, making engineering construction much easier. (3) Shading time adjustment There is a shading time adjustment knob on the receiver. Generally, the shading time of the probe is adjustable from 50m/s to 500m/s. When the probe is shipped from the factory, the shading time of the probe is adjusted to a standard in the factory. In position, under normal circumstances, this position is a relatively moderate state, taking into account the environmental conditions and the characteristics of the probe itself, so there is no special reason, and there is no need to adjust the shading time. If it is necessary to adjust the shading time due to the fortification, to adapt to changes in the environment. In general, the shading time is short, the sensitivity of the probe is fast, but the sensitivity to falling leaves, flying birds, etc. is also strong, and the possibility of false alarms increases. The shading time is long, the sensitivity of the probe is reduced, and the possibility of underreporting is increased. The engineer should adjust the shading time according to the actual needs of the fortification.

(4) After connecting the probe with the anti-theft host, connect the tamper switch to the input circuit of the zone. After the lian wire is completed, cover the outer casing of the probe and tighten the fastening screw. It is required that the zone warning light on the anti-theft host has no flicker and no light, and there is no alarm indication output in the zone. Indicates that the entire zone is set properly. Otherwise, check the line, re-commission the probe, and re-determine the status of the zone.

(5) Anti-theft performance test After the working condition of the anti-zone is normal, according to the requirements of the fortification, all the possible sizes and shapes of the object similar to the precautions should be used to block the optical axis of the probe at different speeds and different ways, and use the wireless at the alarm site. Walkie-talkie and control center lian, check whether the alarm is normal, and pay close attention to whether there is flashing or unstable state on the alarm host. So as not to leave hidden dangers to the alarm system. We verbally call this process a gun test. The purpose of the gun test is to test whether the zone has the ability to have a normal alarm, whether the scope of the zone protection can meet the predetermined requirements, and whether there is a protective dead zone.