Light Sensor Diode

The graph shows the current to light relationship. This light generated current flows in the opposite direction to current in a normal diode or led.

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A photodiode is often combined into a single component with an emitter of light usually a light emitting diode led either to detect the presence of a mechanical obstruction to the beam slotted optical switch or to couple two digital or analog circuits while maintaining extremely high electrical isolation between them often for safety optocoupler.

Light sensor diode. A 230v ac supply is provided to the load in this case the load is represented with a lamp. Photodiodes and photo transistors are a few examples of photo detectors. Description extend your light sensing spectrum with this analog uv sensor module.

Led as light sensor. This leakage current increases as the illumination of the junction increases. The light sensor circuit is an electronic circuit designed using light sensor ldr darlington pair relay diode and resistors which are connected as shown in the light sensor circuit diagram.

When light falls upon the junction more holeelectron pairs are formed and the leakage current increases. When a photo diode is used as a light sensor for germanium type diodes the dark current is around 10 ua and for silicon type diodes it is 1 ua. The absorbed photons make electronhole pairs in the depletion region.

It uses a uv photodiode which can detect the 240 370nm range of light which covers uvb and most of uva spectrum. A photodiode is simply a pn silicon diode where light will generate a current proportional to light intensity on the pn junction depletion region. As the voltage across the diode increases the linearity decreases.

A led is simply a diode that has been doped specifically for efficient light emission and has been packaged in a transparent case. When used as a light sensor a photodiodes dark current 0 lux is about 10ua for geranium and 1ua for silicon type diodes. A photo detector has a pn junction that converts light photons into current.

As more photons hit the photodiode the current increases causing a voltage across the diode. The photodiode is reversed biased where the cathode goes to a positive voltage and th anode goes to the negative side of the supply. In addition to emitting light an led can be used as a photodiode light sensor detector.

Solar cells convert some of the light energy absorbed into electrical. Leds detect a narrow band of wavelengths which is why i call them spectrally selective photodiodes. Photodetectors also called photosensors are sensors of light or other electromagnetic radiation.

A silicon photodiode has a very broad spectral response about 400nm violet to 1000nm invisible near ir and requires an expensive filter for detecting a specific wavelength. Dark current is the current when the intensity of the light is 0 lux. Therefore if inserted into a circuit in the same way as a photodiode which is essentially the same thing the led will perform the same function.

So why use leds as light sensors.

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