Photometric Detector
This product is no longer available.
- Luminous Flux
- Luminous Intensity
- Illuminance
- Luminance
Photometry is the science of the measuring visible light, in terms of its perceived brightness to the human eye. The photometric detectors are built by using selected, stability tested Si-photovoltaic cells with advanced color filters. They are designed to simulate the response of the human visual system and match to the spectrum of CIE V(λ) function. The error function f1’ is an index that indicates the degree of spectral mismatch. We provide different products in three error classes, such as Class A, Class B and Class C. Every type detector is individually calibrated and measured f1’ to conform to the CIE specifications. They are available in used to measure illuminance (lx) and luminous flux (lm).\
Photomoetry
1. Luminous Flux
◦Photometric power
◦lumen (lm)
2. Luminous Intensity
◦Flux per unit solid angle\
◦lm/sr (cd)
3. Illuminance
◦Flux density \
◦lm/m2 (lx)
4. Luminance
◦Luminance is used to characterize an extended light source
◦cd/m2 (nit)
Products:
Illuminance detectors
◦Illuminance detector is with cosine correcting optics.
Luminous Flux detectors
◦Luminous flux detector is built with a precision.
◦V(λ) sensor
Applications:
Illuminometer
◦Illuminance measuring detectors Integral Sphere and Goniophotometer
◦Illuminance measuring detectors
◦Luminous Flux measuring detectors
Specifications:
Quantity | Symbol[nb 1] | SI unit | Symbol | Dimension | Notes | |||
---|---|---|---|---|---|---|---|---|
Luminous energy | Qv [nb 2] | lumen second | lm⋅s | T⋅J [nb 3] | units are sometimes called talbots | |||
Luminous flux | Φv [nb 2] | lumen (= cd⋅sr) | lm | J | also called luminous power | |||
Luminous intensity | Iv | candela (= lm/sr) | cd | J | an SI base unit, luminous flux per unit solid angle | |||
Luminance | Lv | candela per square metre | cd/m2 | L−2⋅J | units are sometimes called nits | |||
Illuminance | Ev | lux (= lm/m2) | lx | L−2⋅J | used for light incident on a surface | |||
Luminous emittance | Mv | lux (= lm/m2) | lx | L−2⋅J | used for light emitted from a surface | |||
Luminous exposure | Hv | lux second | lx⋅s | L−2⋅T⋅J | ||||
Luminous energy density | ωv | lumen second per metre3 | lm⋅s⋅m−3 | L−3⋅T⋅J | ||||
Luminous efficacy | η [nb 2] | lumen per watt | lm/W | M−1⋅L−2⋅T3⋅J | ratio of luminous flux to radiant flux | |||
Luminous efficiency | V | 1 | also called luminous coefficient | |||||
See also: SI · Photometry · Radiometry |