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A semiconductor detector is a device that uses a semiconductor (usually silicon or germanium) to detect traversing charged particles or the absorption of photons. In the field of particle physics, these detectors are usually known as silicon detectors.
Most breathalyzers use one of three technologies to detect Blood Alcohol Content (BAC), which is the concentration of alcohol in a person's blood: a semiconductor oxide sensor, a fuel cell sensor or an infrared spectrometer.Semiconductor oxide-based testers, such as the. or. , are relatively new and very affordable.nfrared Spectrometry is used in large, table-top breathalyzers often found at police stations (and in. ). Spectrometers work by identifying molecules based on the way they absorb infrared light. The level of ethanol in a sample is singled out and measured, and a subject's alcohol level can then be determined.