Linear optical sensing device

Abstract

The invention provides a linear optical sensing device, comprising: a sampling hold amplifier (sampling hold AMP), whose positive-phase input end and opposite-phase input end are respectively connected with an optical sensing diode, the output end of the sampling hold amplifier is connected with a set of drivers (Driver); the set of drivers (Driver) is provided with a first crystal switch and a second crystal switch, through the switching of the first crystal switch and the second crystal switch, the output value can be led to present linear signal along with the brightness change of the light source.

Description

technical field [0001] The invention relates to a light sensing device, in particular to a linear light sensing device. Background technique [0002] see figure 1 As shown, it is a schematic diagram of a photoresistor. The characteristic of photoresistor 100 is that the resistivity changes with the intensity of incident light. It can respond to light. When there is light, it will conduct electricity immediately; when there is no light, it will stop immediately . [0003] see figure 2 As shown, it is a schematic diagram of a photodiode. The photodiode 200 uses a diode structure. When photons irradiate the depletion region of the diode, the generated electron hole pairs are opposite to the electric power received, causing the electron holes to separate and enter individually. The N-type and P-type neutral regions form a photocurrent to make the circuit conduction. [0004] However, if the general light sensor uses the above-mentioned photoresistor 100 or photodiode 200 al...

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Problems solved by technology

[0004] However, if the general light sensor uses the above-mentioned photoresistor 100 or photodiode 200 alone, it is easily disturbed by temperature or noise when it is working, and its output has only a single signal and cannot sense two signals; therefore, in order to get rid of the existing Shortcomings, the inventor of this case provides a linear light sensing device through many trials and improvements based on his own professionalism and technical concepts and years of experience in the work described above, which is not easily affected by Temperature or noise interference, in order to achieve the purpose of accurately detecting the light source, and the output value is a linear signal as the light source changes

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