How does the infrared receiving tube detect and respond to the infrared signal?
Publish Time: 2024-08-23
The process of infrared receiving tube detecting and responding to infrared signal involves photoelectric effect and signal conversion. Here is a detailed explanation of the process:
Photoelectric effect:
The infrared receiving tube contains a photosensitive element, such as a photodiode or phototransistor. When the infrared signal (that is, infrared light) shines on the photosensitive element, the photon energy is absorbed by the semiconductor material, resulting in a change in the electronic state inside the material, which in turn generates a photocurrent. The size of this photocurrent is proportional to the intensity of the infrared light illuminated on the photosensitive element, thus achieving the conversion of the infrared signal to the electrical signal.
Signal amplification and processing:
Since the directly generated photocurrent can be very weak, an amplifier circuit is usually integrated inside the infrared receiving tube to amplify the photocurrent so that subsequent circuits can be more easily detected and identified. The amplified electrical signal also needs to be filtered and reshaped to remove noise and interference and improve the accuracy and reliability of the signal.
Response characteristics:
The response speed of infrared receiving tube to infrared signal depends on the design of its internal circuit and the performance of the photosensitive element. In general, high-quality infrared receiving tubes can quickly respond to changes in infrared light signals and reach a stable state in a short time. In addition, the infrared receiving tube also has a certain wavelength selectivity and Angle sensitivity, that is, it can only produce an effective response to the infrared light signal in a specific wavelength range, and the signal received in a specific Angle range is the strongest.
Application environment and limitations:
In practical applications, the detection and response performance of infrared receiving tubes is also affected by environmental factors, such as light intensity, temperature, humidity and electromagnetic interference. In order to ensure the normal operation of the infrared receiving tube, it is necessary to design the circuit reasonably and select the appropriate installation position to reduce the impact of environmental factors on the receiving performance.
In summary, the infrared receiving tube converts the infrared signal into an electrical signal through the photoelectric effect, and realizes the detection and response of the infrared signal after amplification, filtering and other processing. Its working principle, signal amplification and processing, response characteristics, application environment and limitations are the key factors that affect the performance of infrared receiving tubes.
