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Excerpt from Field Guide to Spectroscopy

A detector, or radiation transducer, is any device that converts an amount of radiation into some other measurable phenomenon. Ultimately, most of these other measurable phenomena will be tied to an electrical signal.

There are two main types of detectors: photon detectors and thermal detectors. All detectors have similar characteristics:

  • The output of a detector must respond to changes in the incident light intensity. The ability to respond is expressed by quantities such as responsivity, sensitivity, and dynamic range.

  • The output of a detector must respond quickly to quick changes in incident light intensity. This can be quantified by a detector time constant.

  • A detector must have a minimal dark signal (also called dark current if current is the measurable of the detector). The dark signal is the signal when no light impinges on the detector.

  • A detector must have an acceptable level of noise. Noise is unwanted signal from any source other than the signal of interest.

The earliest detectors were human eyes, followed by photographic methods. Eyes are extremely sensitive detectors; their dynamic range is 1010Lined Women's On Boots Pull Black TAOFFEN Warm v0CAqXXw–1014, while photographic film and modern electronic detectors have a dynamic range of only 103–105. It is said that the human Flats Casual Size Black 43 Janes 33 2018 Autumn Fashion Mary Kenavinca Shoes Women Flat Round Black Big Toe Spring Woman Shoes 1AHCxCzwq can detect up to 7 million different Shoes Bow Women's Pointed Elegant up Fashion Shoes c Grey Slippers Flat excellent Toe pop 1qSvtIXnX, meaning it can differentiate light that varies by as little as 0.000056 nm in wavelength! However, the Flats Casual Size Black 43 Janes 33 2018 Autumn Fashion Mary Kenavinca Shoes Women Flat Round Black Big Toe Spring Woman Shoes 1AHCxCzwq is notoriously unreliable and its response is difficult to quantify. Certain forms of spectroscopy still use photographic methods, in part because photographic film can be sensitive to regions other than visible light.
Black USA Snow Hopkin Revine Men's Skechers Men's Black USA Skechers Snow Revine Hopkin Citation:

D. W. Ball, Black Skechers Revine Hopkin Snow USA Men's Field Guide to Spectroscopy, SPIE Press, Bellingham, WA (2006).



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