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Based on the Seebeck effect, T/Cs operate on the premise that each metal develops a voltage differential across its length based on the type of metal and the difference in temperature between the ends of the wire. They consist of two wires made of dissimilar metals joined at the point of measurement. Thermocouples (T/Cs) are the most common type of sensor because they don't require an excitation signal. Though there are many types of temperature sensors, most are passive devices: Thermocouples, RTDs (resistance temperature detectors), and thermistors. Temperature sensors are used on circuit boards, as part of thermal tests, in industrial controls, and in room controls such as in calibration labs and data centers. We have temperature measurement-and-control units, called thermostats, in our home heating systems, refrigerators, air conditioners, and ovens. Temperature sensors Temperature is the most common of all physical measurements. By all means add your two cents in the comments area below and we can update the list as needed.

They were worth mentioning, but we felt that photoresistors and photodiodes was a better fit. We could have written an entire section on CCD and CMOS optical sensors used in cameras. We also chose to focus on photoresistors and photodiodes when discussing optical sensors. So we chose to highlight inductive proximity sensors because they're more widely used. But some proximity sensors are capacitive.

Then, we discuss inductive sensors as they're used to detect proximity. For example, we discuss capacitive sensors in terms of how they're used in touch screens. We did our best to group the following sections in a way that makes sense, but of course, we were working with something that's more of a matrix. Editor's note: Classifying anything is a challenge, and sensors are no exception. If you've forgotten those fundamentals, are new to sensor applications, or just need a handy list for reference, this article offers a review of major sensor types and applications. The Apple iPhone brought the benefits of integrated multi-sensor technology to the masses, and while the application of sensors and their associated algorithms has multiplied and changed the world forever, the fundamentals of the main sensor types and how they work has not.

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