What is an infrared sensor? Application of infrared sensor in SmartHome

Infrared sensor is a technology that is increasingly being applied in household products to create a SmartHome smart home. Join lassho.edu.vn to learn about the infrared sensor and its common applications.

What is an infrared sensor?

An infrared sensor (English: Infrared Sensor or abbreviated IR Sensor) is an electronic device that emits or receives infrared radiation in its surroundings. When the object emits a temperature above 35 degrees Celsius, it will emit infrared radiation that cannot be seen by humans.

Infrared sensor classification

There are two main types of infrared sensors today:

• Active infrared sensor : When the object is close, the infrared rays emitted by the device will hit the objects and reflect back, from which the sensor recognizes the object.
• Passive infrared sensor : Does not emit infrared by itself, but will automatically detect and receive infrared rays from thirsty objects.

Working principle of infrared sensor

The working principle of infrared sensors is:

• Active infrared sensor : Consists of 2 components: an infrared source that uses an LED bulb to emit infrared waves and an infrared sensor. When encountering an object, the infrared ray bounces back and enters the infrared sensor.

• Passive Infrared Sensor : Simply a thermoelectric sensor, infrared filter and Fresnel lens to detect infrared rays emitted by an object.

How to set up the infrared sensor

Application of infrared sensor

Infrared sensors are used in SmartHome devices to detect human movements, thereby automatically controlling the devices to act as programmed. Outstanding applications of infrared sensors include:

Automatic light on and off

By detecting motion or infrared waves emitted by humans, the infrared sensor will connect to the lights to turn on and off automatically, which is very convenient and saves energy. Infrared sensors are often placed in locations such as hallways to illuminate walkways, doors, or restrooms.

Infrared sensor for anti-theft

When detecting a foreign object entering the house such as a fence, balcony, the infrared sensor will connect to an audible device to alert the homeowner to take precautions and take action. .

Help open the door automatically

The infrared sensor placed at the top will detect the movement in and out and then control the door to open/close accordingly. You can see this application most clearly in commercial centers or offices.

Help transmit control commands

Infrared rays have long been used in TV remotes, air conditioners to emit remote control signals. Currently, with the integration of infrared sensors on devices and smartphones that can emit infrared rays, you can use smartphones to control items.

Infrared sensor helps to create night vision device

Thanks to the principle of converting ambient light photons into electrons, then amplifying with chemicals will create devices that help them see in environments without visible light. This device is commonly used in military and police forces.

Applications in astronomy

Infrared sensors are also used in telescopes, sensing systems and solid-state detectors. Objects that emit heat or infrared will be detected by glasses, thereby helping astronomers to observe objects in the universe.

Application in the art of making and restoring pictures

Researchers use infrared reflection to analyze and study hidden layers in art paintings. The characteristics of the painting such as material, age will be discovered and from there it will be determined whether the painting is real or fake.

Applications in a number of other important areas

Besides the above applications, infrared sensors are also applied in a number of other fields such as:

• Climatology
• Meteorology
• Optical modulation
• Gas detector
• Water analysis
• Moisture analysis
• Gas analysis
• Anesthesia test
• Oil and gas exploration
• Railway safety

Some notes when installing and using infrared sensors

To ensure that the infrared sensor works as intended, there are a few things to keep in mind after installation:

• Do not install infrared sensors in blind spots or obstacles that prevent the detector from detecting the target.
• Avoid installation near heat sources, which can easily cause false alarms such as air conditioners, air vents, fireplaces and sunlight because the infrared head is very sensitive to infrared energy.
• The infrared detector must be placed at the correct height as shown in the technical documentation.
• Inspect the detector thoroughly after installation to ensure proper operation.

Hopefully, the above article has provided you with useful information about the infrared sensor and its application in SmartHome. If you have any questions, please leave a comment below for lassho.edu.vn to answer.