quantitykind:PhotoThresholdOfAwarenessFunction
http://qudt.org/vocab/quantitykind/PhotoThresholdOfAwarenessFunction
Types:
qudt:QuantityKind| Predicate | Object |
|---|---|
rdf:type |
qudt:QuantityKind |
dcterms:description |
"Photo Threshold of Awareness Function" is the smallest amount of light the human eye can detect for a stimulus subtending a \(1^o\) radial angle at the eye. Because detection is governed by temporal summation (Bloch's law), within the critical duration the threshold is reached when luminous energy — luminance integrated over time — attains a constant value, so the quantity is expressed as a luminous energy (lumen second). Where the presentation duration is instead held fixed, the same threshold may be reported as a light level, i.e. a luminance (candela per square metre) or illuminance (lux). |
qudt:applicableUnit |
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qudt:hasDimensionVector |
qkdv:A0E0L0I1M0H0T1D0 |
qudt:informativeReference |
https://www.britannica.com/science/human-eye/Colour-vision |
qudt:isoNormativeReference |
http://www.iso.org/iso/catalogue_detail?csnumber=43012 |
qudt:plainTextDescription |
“"Photo Threshold of Awareness Function" is the smallest amount of light the human eye can detect for a stimulus subtending a 1° radial angle at the eye. Because detection is governed by temporal summation (Bloch's law), within the critical duration the threshold is reached when luminous energy — luminance integrated over time — attains a constant value, so the quantity is expressed as a luminous energy (lumen second). Where the presentation duration is instead held fixed, the same threshold may be reported as a light level, i.e. a luminance (candela per square metre) or illuminance (lux). ” |
qudt:specializationOf |
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rdfs:comment |
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rdfs:isDefinedBy |
http://qudt.org/3.5.0/vocab/quantitykind |
rdfs:label |
“Photo Threshold of Awareness Function”@en |
rdfs:seeAlso |
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skos:broader |
Generated 2026-07-28T13:52:55.573+00:00