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7 terms
Photonics Dictionary: S
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photoelectric x
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spectrophotoelectric
Characteristic of the relationship between photoelectric activity and the wavelength of incident radiation.
scanning head
A device composed of a light source and phototube used to scan a moving strip of material in photoelectric side-register control systems.
secondary emission photocell
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photomultiplier tube
A photomultiplier tube (PMT) is a highly sensitive vacuum tube that detects and amplifies low levels of light. It is widely used in various applications where high sensitivity, fast response times,...
semitransparent photocathode
A photocathode that receives radiation from one side and emits a photoelectric current from the opposite side.
skew angle
The angle at which photoelectric sensors are aligned to prevent light from being reflected back to the sensor from the object during retroreflective sensing; also, the angle a measured part is...
spectrofluorometer
An automatic scanning instrument that is used to study a substance's fluorescence over a wide range of wavelengths. It consists of a radiation source, a grating that functions as the monochromator in...
sunlight recorder
An instrument consisting essentially of a photoelectric cell filtered to respond to a specified wavelength region, an amplifier of sufficient gain to provide power enough to control movement of a...
Photonics Dictionary
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