Sensor Circuit

bridge photoelectric detector composed of photosensitive resistor circuit

Published:2011/7/28 21:53:00 Author:John | Keyword: photosensitive resistor, bridge photoelectric detector

In the industrial optical measuring devices, the photosensitive resistor can be used to form the bridge photoelectric detector, just as shown in the figure. The two same models (with equivalent dark resistance) of the photoresistor are used as the bridge. One is for optical detection and the other is sealed with black tape. It is important to prevent it from being subjected to light as it is for temperature compensation. This type of bridge photodetector can be powered by DC or AC. When AC modulation, is used, its output is the AC signal, thus being able to reduce zero drift for the amplifier.   (View)

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THIRD_ELECTRODE_SENSES_FULL_CHARGE

Published:2009/6/29 21:13:00 Author:May

Circuit is suitable only for special nickel-cadmium batteries in which third electrode has been incorporated for use as end-of-charge indicator. Voltage change atthird electrode is sufficient to provide reliable shutoff signal for charger under all conditions of temperature and cell variations.-D. A. Zinder, Fast Charging Systems for Ni-Cd Batteries, Motorola, Phoenix, AZ, 1974, AN-447, p 7.   (View)

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FAHRENHEIT_THERMOMETER

Published:2009/6/29 2:03:00 Author:May

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BASIC_DIGITAL_THERMOMETER_CELSIUS_AND_FAHRENHEIT_SCALES

Published:2009/6/29 2:02:00 Author:May

Maximum reading on the Celsius range is 199.9 ℃, limited by the (short-term) maximum allowable sensor temperature. Maximum reading on the Fahrenheit range is 199.9 °F (93.3 ℃), limited by the number of display digits. VREF for both scales is 500 mV.   (View)

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POSITIVE_TEMPERATURE_SENSOR_COEFFICIENT_RESISTOR

Published:2009/6/29 2:00:00 Author:May

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GROUND_REFERRED_CENTIGRADE_THERMOMETER_1

Published:2009/6/29 1:59:00 Author:May

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TEMPERATURE_SENSOR_1

Published:2009/6/29 1:58:00 Author:May

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GROUND_REFERRED_CENTIGRADE_THERMOMETER

Published:2009/6/29 1:57:00 Author:May

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GROUND_REFERRED_FAHRENHEIT_THERMOMETER

Published:2009/6/29 1:55:00 Author:May

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0℃_100℃_THERMOMETER

Published:2009/6/29 1:55:00 Author:May

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TEMPERATURE_TO_FREQUENCY_CONVERTER

Published:2009/6/29 1:52:00 Author:May

The circuit exploits the fact that when fed from a constant current source, the forward voltage of a silicon diode varies with temperature in a reasonably linear way. Diode D1 and resistor R2 form a potential divider fed from the constant current source. As the temperature rises, the forward voltage of D1 falls tending to turn Q1 off. The output voltage from Q1 will thus rise, and this is used as the control voltage for the CMOS VCO. With the values shown, the device gave an increase ofjust under 3 Hz/℃ (between 0 ℃ and 60 ℃) giving a frequency of 470 Hz at 0 ℃.   (View)

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0°F_50°F_THERMOMETER

Published:2009/6/29 1:49:00 Author:May

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LOWER_POWER_THERMOMETER

Published:2009/6/29 1:48:00 Author:May

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CENTIGTADE_THERMOEETER

Published:2009/6/29 1:47:00 Author:May

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KELVIN_THERMOMETER_WITH_GROUND_REFERRED_OUTPUT

Published:2009/6/29 1:46:00 Author:May

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DIFFERENTIAL_TEMPERATURE_SENSOR

Published:2009/6/29 1:44:00 Author:May

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SIMPLE_DIFFERNTIAL_TEMPERATURE_SENSOR

Published:2009/6/29 1:42:00 Author:May

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REMOTE_TEMPERATURE_SENSING

Published:2009/6/29 1:39:00 Author:May

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BASIC_DIGITAL_THERMOMETER_KELVIN_SCALE_WITH_ZERO_ADJUST

Published:2009/6/29 1:35:00 Author:May

This circuit allows zero adjustment as well as slope adjustment. The ICL8069 brings the input within the common-mode range, while the 5 K pots trim any offset at 218 °K (-55 ℃), and set scale factor.   (View)

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BASIC_DIGITAL_THERMOMETER_KELVIN_SCALE

Published:2009/6/29 1:30:00 Author:May

The Kelvin scale vers1on reads from0 to 1999°K theoretically，and from 99Q°K to 473°K actually. The 2.26 K resistor brings themput within the ICL7106 VCM range∶twogeneral-purpose silicon diodes or an LED maybe subsituted．   (View)

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