Infrared detection device and infrared photoelectric sensor

Abstract

The invention provides an infrared detection device and an infrared photoelectric sensor. The infrared detection device comprises a first resistor; an infrared transmitting tube; a driving tube; a second resistor; an infrared receiving tube; a filter circuit connected with a second electrode of the infrared receiving tube for filtering out direct current signals from the input pulse signals; and avoltage comparison circuit. According to the infrared detection device and the infrared photoelectric sensor of the invention, the control electrode of the driving tube is used for inputting pulse control signals. When the driving tube is turned on, the infrared transmitting tube emits infrared ray, and when the driving tube is turned off, the infrared transmitting tube stops emitting infrared ray, so that the infrared detection device works in a pulse mode with low duty cycle, thereby reducing energy consumption and increasing the working time on a battery device. The filter circuit can filter out the direct current signals generated by ambient light interference, and can avoid the interference of infrared ray in ambient light, so that the infrared detection device can still work normally under intensive outdoor light.

Description

technical field [0001] The invention relates to the technical field of sensors, in particular to an infrared detection device and an infrared photoelectric sensor. Background technique [0002] Infrared photoelectric sensors can be used to detect changes in the brightness and color of the ground, and can also be used to detect the presence or absence of approaching objects. [0003] In the related art, the circuit of the infrared photoelectric sensor is usually figure 1 As shown, the infrared emitting tube of the infrared pair tube emits infrared light, which is reflected by the tested object and received by the infrared receiving tube. According to the intensity of the received light, the infrared receiving tube will generate a corresponding current, which is pulled up by the infrared receiving tube. A voltage drop occurs after the resistor, and when the voltage drop reaches the threshold set by the comparator LM393 (the object under test is close enough), the comparator d...

AI Technical Summary

Problems solved by technology

Because the sun contains a lot of infrared rays, it will cause the detection distance to change or even the infrared receiving tube is completely saturated, and it is difficult to work normally under the condition of strong outdoor light;

[0006] (2) The continuous operation of the infrared emission tube will consume a lot of power. When used on battery equipment, the battery will be consumed quickly and the working time will be short.

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