Infrared sensors with digital and analog output functions have been promoted recently to have their optical products enriched. Due to their fast response and relatively low current, these best detectors have much more applications.
Some detective sensors could adjust their detective threshold according to the surrounding light intensity and light noise. To avoid the detective mistakes when surrounded by noise, the amplifier gain will adjust automatically to the low level which may affect the characters of a certain sensor. Meanwhile, the sensor will increase its gain at the condition of low light intensity to make the acceptor much more sensitive so that the sensor could detect the reflected light and the unnecessary light and respond accordingly.
Infrared sensors with digital and analog output functions adopt fixed gain so that the above problems can be solved. The detective threshold and distance are both fixed owing to the adoption of the fixed gain. Besides, once the optical parameters of the light intensity of the emitter, the hole diameter of the acceptor, the array of both the emitter and the acceptor are determined, the sensor will be stay stable and repeatable under all the lighting conditions.
Other applications require the sensor can not only detect the existence of light but also can judge the distance of the object according to the condition of the signal reflected. The new sensor will solve all these problems of the fixed threshold and the analog information from the sensor. The impulse length made by the sensor will response according to the signal emitted. For objects far away, the output impulse will become shorter. Related chip of the sensor is: 2SK3068.
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