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8 terms
Photonics Dictionary: P
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photoelectric cells x
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PEC
photoelectric cell
photoelectric control
The control of an instrument or electrical circuit by the current produced by varying radiation incident to a photoelectric cell.
photoelectric counter
A device used to count objects that pass a given point by allowing each object to obstruct a beam of light falling on a photocell. Slow counting rates can be recorded by a mechanical counter, but...
photoelectric exposure meter
A device consisting of a microammeter, a photovoltaic cell and a battery. It is used for the measurement of scene brightness and the determination of correct exposure for photographic processes.
photoelectric photometer
Also known as electronic photometer. A photometer with a photocell, phototransistor or phototube for measuring the intensity of light.
photoelectric pyrometer
An instrument used to measure the temperature of a source through the use of photoelectric cells to detect and measure the intensity of the light emitted by the source.
photoelectric receiver
An instrument that uses a photocell to detect and measure the intensity of incident light.
phototelegraphy
A document-transmitting process that uses a cylinder that rotates the document to be scanned and detected by a photoelectric cell. The cell transforms the light into electrical energy that may be...
Photonics Dictionary
P
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