glossmeter sentence in Hindi
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- The glossmeter is a useful instrument for measuring the gloss of a surface.
- Lower quality measurements using a glossmeter quantify the glossy appearance of a surface in gloss units.
- Two high gloss surfaces can measure identically with a standard glossmeter but can be visually very different.
- International standards state that it is the tile that is the calibrated and a traceable artefact not the glossmeter.
- In order to maintain the performance and linearity of the glossmeter it is recommended to use a checking standard tile.
- The interval of checking this calibration is dependent on the frequency of use and the operating conditions of the glossmeter.
- Standard tiles which are used in working conditions will require regular calibration or checking by the instrument manufacturer or glossmeter calibration specialist.
- If a calibration standard becomes permanently scratched or damaged at any time it will require immediate recalibration or replacement as the glossmeter may give incorrect readings.
- In 1922 Jones, during his study of gloss of photographic papers using goniophotometry, developed a glossmeter based on his research, which provided closer correlation to gloss ratings assigned by visual evaluation.
- Each glossmeter is set up by the manufacturer to be linear throughout its measuring range by calibrating to a set of master calibration tiles traceable to BAM Federal Institute for Materials Research or similar organisations.
- Gloss level can be characterized by the angular distribution of light scattered from a surface, measured with a glossmeter, but there are various ways of measuring this, and different industries have different standards.
- Jones glossmeter used a geometric configuration of 45?/ 0?/ 45?whereby the surface was illuminated at 45?and two incident reflective angles measured and compared at 0?( diffuse reflectance ) and 45?( diffuse plus specular reflectance ).
- A typical glossmeter consists of a fixed mechanical assembly comprising a standardised light source that projects a parallel beam of light onto the test surface to be measured and a filtered detector located to receive the rays reflected from the surface, Figure 1.
- For his research he used a glossmeter with a specular angle of 45?as did most of the first photoelectric methods of that type, later studies however by Hunter and Judd in 1939, on a larger number of painted samples, concluded that the 60 degree geometry was the best angle to use so as to provide the closest correlation to a visual observation.
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