Linear Light Sensor

Linear Light Sensor, we also call it phototransistor or photosensitive resistance. The chip integrated inside is very sensitive to light changes. So normally it is used to detect the current ambient light level and converts the light energy into an electrical signal output.

Compared with traditional photoresistors, light sensor is more environment friendly and complied with ROHS requirements. We can also make it to be SMD type with mini size. It is more and more popular now.

Senba Sensing Technology Co.,Ltd., was founded in 2005, with the focus on producing the top quality pir sensor d204b. If you want to know more details, just feel free to contact us!


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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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How to Use Ldr Sensors to Realize the Circuit Control of Photoswitch?

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  Ldr sensors are sensitive to light sticking. The stronger the light, the smaller the resistance value; the darker the light, the greater the resistance value. So we can use this characteristic to construct the photosensitive circuit, and cooperate with relay/triode/MOS transistor to realize the photoswitch. Next, the circuit of realizing photoelectric switch by using ldr sensor, transistor and relay is introduced.       1. What is Ldr Sensor The working principle of ldr sensor is based on the internal photoelectric effect. The ldr photocell is very sensitive to light. Without light, ldr sensor presents a state of higher resistance value. Under strong light, its resistance value decreases rapidly, and presents a lower resistance value. The following is the physical diagram and characteristic curve of the ldr sensors.       2. Design of Optical Switch Circuit-Triode Implementation The circuit of the photoelectric switch is mainly composed of ldr sensor...
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PIR Sensors Used in Security Alarms and Automatic Lighting Applications D205B

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Overview D205B is widely used for ceiling lamps and has a large detection angle.The pyroelectric infrared sensor detects infrared radiation on the basis of the characteristics that the polarization of pyroelectric material changes with temperature. Senba  is the specialist PIR manufacturer for more than 15 years. We are the most advanced factory with complete categories. With strong R&D center, there are digital type and analog type, dual elements and four elements for you choose. The market cover domestic market, Korean, America, Turkey and Europe. Features Low power consumption Wide angle Slight movement can be detectable Recommended Model D205B Encapsulation Type TO-5 IR Receiving Electrode 0.7×2.4mm, 4 elements Window Size 4.9 × 4.9mm Spectral Response 5–14µm Transmittance ≥75% Output Signal[Vp-p] ≥5000mV Sensitivity ≥4300V / W Detectivity (D*) 1.6 × 108 cmHz 1/2 / W Noise[Vp-p] <70mV O...
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