9
2017

Infrared motion sensor

Infrared motion sensor

Detects body heat (infrared energy). Passive infrared sensors are the most widely used motion in home security systems. When your system is armed, your. Infrared intrusion detector (sensor) mainly includes active infrared detector (AIR) and passive infrared detector (PIR). The principle of working theory is different. Buy products related to infrared motion sensor products and see what customers say about infrared motion sensor products on goldzoloto.ru ✓ FREE DELIVERY./

Passive infrared sensor

Режимы работы Режим работы модуля задается перемычкой. Есть два режима — режим H и режим L. На фото выше в модуле установлен режим H. Режим H — в этом режиме при срабатывании датчика несколько раз подряд на его выходе на OUT остается высокий логический уровень.

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Режим L — в этом режиме на выходе при каждом срабатывании датчика появляется отдельный импульс. Ну и еще одна картинки, скопировал из даташита на PIR-датчик: These sensors discern human movement by detecting incident IR radiation, which varies in proportion to the temperature difference between human body surfaces and the surrounding environment.

The sensors, in essence, can distinguish the thermal signature emitted by a human being from the thermal signature emitted by walls, ceilings, floors and other inanimate objects. Outside that operating temperature range, the sensor may output false detection signals.

Keep in mind that changes in ambient temperature can also affect sensor performance. For example, detection can be more difficult in the summer because there tends to be a smaller difference between body and ambient temperatures than in the winter. The amount and color of clothing can make a small difference in sensor performance.

Пироэлектрический сенсор позволяет фиксировать движение тёплых объектов  1 X HC-SR Adjust IR Pyroelectric Infrared PIR Motion Sensor Detector Module.

Because clothing affects the amount of IR radiation emitted by the human body, it changes the differential between human body and ambient temperatures. The effect of clothing, however, is minor compared to the influence of ambient temperature.

The best IR sensors have a nominal sensing distance that can range from 2 to 12 meters, depending on the model.

This distance specification does not necessarily represent the farthest distance the sensor can detect. IR sensors have a response time of about 0.

The response time represents the interval between the actual movement and the detection of that movement. The duration of the sensor output signal after detection depends on the speed of movement and the magnitude of temperature difference.

Infrared Motion Sensors

It usually averages to at least 10mS. This type of sensor is particularly well-suited to applications that require a wide detection area, even if that detection area that extends to walls and floors. IR motion sensors also excel at detecting even the slightest motions.

К примеру, можно исключить из срабатывания собаку или кошку.

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Второй потенциометр регулирует время срабатывания T. Если датчик обнаружил движение, он генерирует на выходе положительный импульс длиной T. Наконец, третий элемент управления — перемычка, которая переключает режим датчика. В положении L датчик ведет отсчет Т от самого первого срабатывания.

Зайдя в комнату, человек вызовет срабатывание датчика, и свет включится ровно на время Т.

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1 comments on “Infrared motion sensor”

  1. A PIR-based motion detector is used to sense movement of people, animals, or other objects. They are commonly  ‎Operation · ‎Product design · ‎Focusing · ‎Security applications.