What are the characteristics and parameters of the photosensitive resistor?

Last Update Time: 2019-01-08 15:44:42

Most of the photosensitive resistors are made of semiconductor materials. It makes use of the optical conductivity of semiconductor to make its resistance value change with the intensity of the human light. When the human ray is enhanced, its resistance decreases significantly, and the resistance increases when the human ray is weakened. The photosensitive resistor is made up of glass substrate, photosensitive layer and electrode.

l The characteristics of photosensitive resistor

Its resistance varies with the intensity of the light, and has a higher sensitivity. It can be used in AC and DC circuits, with stable electrical performance, small volume, simple structure, low price and wide application range.

l Main parameter of photosensitive resistor

(1). Rated power (PM) refers to the maximum power that permit the long-term continuous load of the photoresistor to be consumed under certain conditions.

At this power, the temperature of the resistor itself does not exceed the maximum operating temperature.

(2). Bright resistance (R) refers to the resistance of photosensitive resistor to light.

(3). Dark resistance (Rp) is the resistance of photosensitive resistors under dark conditions without light.

(4). The highest voltage (Um) of the photosensitive resistor is: allowed to withstand the maximum voltage under rated power.

(5). The current at which the bright current photosensitive resistor is exposed to illumination at specified applied voltage.

(6). Dark current (Ip):The current through a sensitive resistor of 0lx illumination at the applied voltage.

(7). Time constant (T) refers to the time required for a photosensitive resistor to start from a light jump to 63% of a stable bright current.

(8) Resistance sensitivity refers to the ratio of dark current to bright current.

(9). Current sensitivity refers to the ratio of photocurrent of a photosensitive resistor to the luminous flux to which it is irradiated.

This article is from Allicdata Electronics.

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