Comparison between infrared sensor LED light and LED radar induction fluorescent lamp

Infrared sensing, the accurate statement is a passive infrared sensor, which relies on a passive infrared probe to detect infrared rays of about 10uM. About 10uM of infrared light emitted by a car (or a person) is reinforced by a Fresnel filter and concentrated on an infrared sensing source. The infrared sensing source usually uses a pyroelectric element, which receives a change in the temperature of the infrared radiation. Will lose the charge balance, release the charge outward, the subsequent circuit can generate an alarm signal after detection and processing. Philippine filter is different according to performance requirements, with different focal length (sensing distance)

Second, the factors affecting the infrared LED tube sensing distance:

1 Most of the infrared sensing LEDs on the market are designed with two sensitive elements. The sensing angle is 120 degrees, the window is small, and the focal length (sensing distance) of the Philippine filter is small, so the sensing distance is close. The latest technology adoption is a four-sensing element design with a sensing angle of 150 degrees and a large window, so the sensing distance is long.

2. The sensitivity of the infrared pyroelectric sensor to the car (human body) is also highly dependent on the direction of motion of the person. The infrared pyroelectric sensor is the least sensitive to the radial movement reaction, and is most sensitive to the transverse direction (ie, the direction perpendicular to the radius); therefore, the infrared-sensing LED should be installed as parallel as possible to the lane, and the angle at which the tube is installed With a slight adjustment, the direction of the probe should be as close as possible to the area that needs to be sensed, so that the sensing distance is far. Note: The 8 meters in the parameter refers to the tangential movement in the forward direction.

The height of the infrared tube suspension is not less than 2.5 meters, and the sensing area is an ellipse with a diameter of 8 meters (radius of 4 meters).

3. Whether the lens or the sensing window is covered with dust, the dust can affect the sensitivity and the sensing range. Pay attention to the lens to be removed and installed, and wipe it with a clean electrostatic cloth.

4. When the ambient temperature and the human body temperature are close, the detection and sensitivity are obviously reduced, sometimes causing short-term failure, commonly known as temperature drift, and the force-inducing lamp adopts the temperature drift suppression design to effectively overcome this problem.

Third, the working principle of radar microwave sensor:

Using the Doppler principle of electromagnetic waves, the intelligent radar sensing scheme uses the Doppler principle to transmit a microwave radar signal of about 5.8 GHz. When a moving object enters the electromagnetic field of the radar, it can feed back the signal to the receiving circuit. , thereby triggering the changing of the working state of the circuit. The general sensing distance can be 5-9 meters, as long as the object moves to trigger. Although the object is within its trigger range, it will not be triggered if it does not move. Radar induction can penetrate non-metallic objects such as plasterboard, wood, etc., and is especially suitable for ** installation. If a metal object blocks the emitting surface, it will greatly reduce its sensitivity, so pay special attention to it. Radar induction is less affected by interference and has higher sensitivity, which is especially suitable for lighting solutions in underground parking lots. Any wave has a characteristic of reflection. When a wave of a certain frequency hits the barrier, a part of the wave is reflected back. If the blocker is stationary, the wavelength of the reflected wave is constant, if the obstacle is When the wave source moves, the wavelength of the reflected wave is shorter than the wavelength of the wave source. If the obstacle moves away from the wave source, the wavelength of the reflected wave is longer than the wavelength of the wave source, and the change of the wavelength means the change of the frequency. Microwave induction knows that a moving object is approaching or moving away by changing the reflected wave, and then converting this change into an electrical signal output.

Fourth, the characteristics of the radar microwave sensor:

1) This kind of probe is aimed at detecting active people or objects. As long as there are moving people or objects within the range of microwave control, it can sensitively trigger.

2) The sensor performs the detection activity through an antenna board that performs both signal transmission and signal reception. The microwave signal emitted by the antenna can penetrate non-metallic objects such as curtains and thin walls.

3) The sensor can be debugged into different sensing distances and sensing ranges according to different performance requirements.

Fives. Comparison and selection of infrared LED tubes and radar LED tubes

Radar induction is the use of Doppler principle to sense moving objects. The sensitivity is high. The thermal release infrared induction is the use of infrared light to induce moving objects released by the human body or other living bodies or even heat sources, and the sensitivity is relatively low. According to our usage, there is a certain percentage of false triggering probability. Relatively speaking, the probability of radar sensing is slightly higher. But in terms of the effect, the radar sensor is better, there will be no phenomenon that the car is coming over and the light is not lit. The radar emits electromagnetic waves that can be detected by equipment within the detection range. Ultra-low altitude aircraft radar cannot be found. Infrared is the temperature of the object to detect the object, the two work differently, the radar can not find smoke. For example, in the snow in winter, someone is lurking, and it can be found with an infrared detector, but the radar can't find it. The radar emits radio waves, which receive echoes that are reflected by objects that cannot be penetrated by radio waves. The infrared rays emit infrared light waves, which have weak reflection ability and can only be received by infrared receivers. Opaque objects can block their light waves. .

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