Wuhan Guide IR136 Manuel d'utilisateur télécharger pdf (Page 74)

Thermografie in der Theorie und Praxis (INTERNET: www.irPOD.net / e-MAIL: [email protected] ) © Bernd Schindel 2007

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High-Pass Filter

A filter which is blocked at low wavelength, whose transmission spectrum extends from a low cut-on

wavelength up in wavelength to the maximum pass wavelength of the detector.

Hue

A term expressing the "color" aspect of a color display; part of the HLS (Hue, Luminosity, Saturation) color

model. Without hue, there are only shades of gray.

Hybrid(circuit)

A process or the result of a process for making electronic components of higher density than normal printed

circuit board technology. Since hybridizing electronics can be more expensive than discrete circuitry it is

only used when space is at a premium as in the sensing head electronics of an infrared system.

Hydrostatic Testing

A means of testing high pressure reservoir integrity which involves placing the reservoir in a large tank of

water, filling the reservoir with water to a known pressure and measuring the amount of flexure in the

reservoir walls by monitoring water displacement in the tank.

Image Uniformity

See shading.

Image Enhancement or Signal Noise Improvement

Techniques used to modify an image to present an observer with more readily accessible information.

Imager

The part of an infrared system which contains the detector, optics and scanning mechanism. The imager

must be held and pointed at whatever scene is to be studied. The word imager is sometimes used instead

of viewer to mean an infrared system which creates relative radiation images without calibration.

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Wuhan Guide IR136 Manuel d'utilisateur Page 74