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A photometer is an instrument for measuring photometric quantities such as luminous flux, illuminance, or luminance.
Standards, Photon counting & UV and visible light transmission photometry
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light photometers used infrared absorption filter solution also wavelength wavelengths photon shadows flux measure different visible counting monochromator exposure intensity
| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| Photometer | is a | instrument for measuring photometric quantities such as luminous flux | 0.90 | text |
| luminous flux | instance of | A photometer is an instrument for measuring photometric quantities | 0.80 | text |
| illuminance | instance of | A photometer is an instrument for measuring photometric quantities | 0.80 | text |
| or luminance.Historically | instance of | A photometer is an instrument for measuring photometric quantities | 0.80 | text |
| photometry was done by estimation | instance of | A photometer is an instrument for measuring photometric quantities | 0.80 | text |
| comparing the luminous flux of a source with a standard source | instance of | A photometer is an instrument for measuring photometric quantities | 0.80 | text |
| photons/cm2 or photons | instance of | The operating principles are the same but the results are given in units | 0.80 | text |
| the X-ray to far ultraviolet | instance of | visible and ultraviolet wavelengths is a photomultiplier to achieve sufficient sensitivity.In airborne and space-based remote sensing such photon counters are used at the upper… | 0.80 | text |
| Photometer | related to Atomic absorption photometry | Atomic | 0.60 | section |
| Photometer | related to Atomic absorption photometry | The | 0.60 | section |
| Photometer | related to Atomic absorption photometry | Metals | 0.60 | section |
| Photometer | related to history | Before | 0.60 | section |
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