Light Dependent Resistors (LDR's) 5mm Photoresistors 7 Types Raspberry

 

 

 

Photosensitive resistor (LDR) belongs to sensitive electronic components and sensors. There are many names including photoresistor, photoconductor, photoconductor unit, light conduit, or simply called light unit (Photore11).

LXD series CdS photosensitive, which belongs to cadmium sulfide photoconductive cell, is usually made of thin sheet structure and sealed with metal shell glass to absorb more light energy. Its resistance is directly related to the intensity of light. When the light is irradiated, the electrons in the semiconductor chip (photosensitive layer) that were originally in a stable state are excited and become free electrons. The stronger the light, the more free electrons will be produced and the smaller the resistance. In short, the light intensity increases and the resistance decreases; When the light intensity decreases, the resistance increases.

Typical spectral response

The spectral response characteristics of photoresistors are similar to those of human eyes. Its sensitivity depends on the incident wavelength. Each photoelectric material has its specific spectral response curve, which corresponds to the wavelength of light.

Features and functions

LXD series metal-clad glass encapsulated CdS photoresistors can provide more excellent solutions for both the sensing of visible optical fiber and the measurement of visible optical fiber. It is also an economical product, and its features and functions can be summarized as follows:

1. It is a low-cost photoelectric element for near-infrared visible light detection.

2. Multiple packaging forms, epoxy resin sealing, metal shell glass packaging (vacuum packaging)

3. It has a very high response speed when switching between very low illumination (full dark 0Lux) and instantaneous strong light (lighting intensity).

4. Small volume, the smallest body diameter can reach φ 3mm, the maximum volume is only φ 325mm。

5. Generally, it can provide products with maximum working voltage of 150 to 400V, and is suitable for operation on 120/240V AC circuit.

6. It is easier to use in DC and AC circuits - the photoresistance changes with the change of light.

7. There are many kinds of visible light sensing to light, such as LED light source, neon lamp, incandescent lamp, fluorescent lamp, laser light source, sunlight, etc.