Do PIR Sensors Work Through Glass?

 No, alarm motion sensors do not work through glass. Most motion sensors use passive infrared (PIR) technology to detect motion. Changes in IR energy are not easily detected through glass. This is why motion sensors will generally not work through windows, which are usually insulated.

 

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The Application of the Idr Sensor

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1. Electronic photometry The photometer can be used to measure the brightness of people and objects, so as to help the photographer choose the appropriate exposure speed. The following is the schematic diagram of the electronic photometer. The ldr sensor  changes the intensity of light into the difference of resistance value, so that the brightness can be displayed directly by different currents flowing through the meter. Among them, R1 and R2 are used to adjust the surface calibration and W is used to control the sensitivity of the meter head. 2. Infrared thermometry The infrared light radiated by the measured object is modulated into 800Hz optical signal by a modulation disc with a filter, which is approximately sinusoidal wave. The modulated light entering into the idr sensor is converted into electrical signals and then sent to the FET amplifier for amplification. The output U0 can reflect the temperature. In order to reduce the influence of noise and temperature c...
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Optocoupler Semiconductor Device LCR-0202 Series for Electric Circuit

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Overview P hototransistor optocoupler  devices use the current changes to control the resistance change. It is a Linear optocoupler which through the strictly selected, aging, testing. O ptocoupler isolation   made up of CDS and LED. Package tyoe for LCR-0202 is DIP-4(cuboid small package). It is widely used in audio power amplifier protection and control. It is recommend that the welding should be made at 4mm of lead wire far away from optoisolator’s seat, and the welding be completed in the shortest possible time. Feature Pure resistor and non-polarity output Wide range of analog liner resistance, "on" at the low resistance. "off" at high resistance Simple circuit configuration suitable for DC and AC use Input to output isolation, and low distortion coupling Datasheet Type LCR- 0202 Series Package DIP-4 Input current 0- 20mA Input Voltage 1.6- 2.5Vdc Output Light Resistance 50Ω - 1KΩ @ 20mA- 0.01mA O...
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Some Knowledge of LDR Sensor

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  LDR sensor (photoresistor light-dependent resistor, and the latter is abbreviated as ldr) or photoconductor, is commonly made of cadmium sulfide, as well as selenium, aluminium sulfide, lead sulfide and bismuth sulfide. These fabricated materials have the characteristics of rapid reduction of resistance under the irradiation of specific wavelength light. This is because the carriers generated by light are all involved in conduction, and it will cause drift under the action of an applied electric field, and electrons run to the positive pole of the power supply, and holes run to the negative pole of the power supply, so that the resistance value of the photoresistor sensor decreases rapidly.   Usually, many types of LDR  sensor   are  made into thin sheet structures to absorb more light energy. When it is irradiated by light, the electron-hole pairs are stimulated in the semiconductor sheet (photosensitive layer) to participate in conduction, which enhances the...
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