What are the different types of IR detectors?
The two main types of infrared or IR detectors are active and passive systems. Active systems use both the infrared light source and the sensor reflecting IR energy. Passive systems use only a detector that senses the difference in IR energy from a person or a warm object and the room itself. Infrared is the frequency of light below the range of human sight, which is emitted or sent by any warm object or person. Depending on the application, a number of commercial detectors are available for sensing various IR wavelengths. These sensors can be either photonic or bright, or thermal or heat sensing device. The ability of an active IR system to send infrared energy to the room improves the scope of sensing. Passive systems are excellent for use in homes. However, these systems can omit parts of the room depending on the design of the sensor lens. More than one sensor may be needed to cover the room.
Flame or heat sensing for fire protection and laboratory use is another use of IR. Heat sensors are often incorporated into domestic or trade alarm systems. This technology is generally passive and changes the sensor monitoring above normal room conditions. Optical fiber systems should be monitored in terms of interruption of services and signal quality and IR detectors can be used to monitor optical signal changes and send alerts as needed.
moisture can be measured or monitored using infrared technology. Water molecules absorb ir energy in certain wavelengths. The active IR system can scan vegetation or crops and determine the levels of moisture from the differences in the signal. Infrared preparations can also be used for scanning sorting by different wavelengths of crops and debris such as dirt or rocks.
temperature sensing is common to use these systems. Founds and metalIR manufacturers can use IR detectors calibrated as thermometers to measure high temperatures at a distance. Detectors can be calibrated for different metals because metals create different frequencies when heated.
Personnel detectors are often used by coercive organs and military. IR can detect the heat of the human and animal bodies against the dark landscape at night. Detection systems can be held manually or deployed on an aircraft to search and rescue or enforce the right.
The gas current analysis can be performed using IR sensors. Infrared energy is absorbed differently for gas mixture components. These sensors are used to test automotive emissions, exhaust gas monitoring and laboratory gas analyzers.