4. Optical effect systems
4.1 Measuring principle
A light beam (wavelength λ: from ultraviolet λ > 50 nm to infrared λ < 1 mm) can be interrupted, deflected, refracted, reflected, attenuated or scattered when an obstacle, such as a liquid or bulk solid, gets in its way: all these phenomena can offer a solution for detecting an interface.
The simplest system, with beam shielding, consists of a light source, the medium to be analyzed and the receiver-detector. In addition, transparent windows are required for liquids or bulk products. A filter can be interposed to work on a narrow wavelength range and thus increase the selectivity of the method.
Daylight, with its broad spectrum, is a disturbing factor, as is ambient lighting. Many optical systems are all...
Exclusive to subscribers. 97% yet to be discovered!
Already subscribed? Log in!
Optical effect systems
Electrical capacitance measurement systems
Article included in this offer
"Physical measurements"
(
67 articles
)
Updated and enriched with articles validated by our scientific committees
A set of exclusive tools to complement the resources
Bibliography
Exclusive to subscribers. 97% yet to be discovered!
Already subscribed? Log in!
