photometer
Brightness measuring device
A photometer is an instrument that measures the intensity of light.
In astronomy, photometers measure the brightness of celestial objects.
In photography and laboratory work, they quantify light levels for exposure or chemical analysis.
The term covers various devices from simple light meters to sophisticated electronic sensors.
SI illuminance unit
- fluxContinuous change or flow
- intensityStrength or force level
- irradianceIncident power per area
- illuminanceReceived light intensity
candela · lumen · transmittance · absorbance · reflectance · wavelength · detector · sensor
Study of light-matter interaction
- magnitudeSize or scale
- stellarOf or like celestial bodies
- luminosityIntrinsic brightness of source
- redshiftWavelength stretch from recession
telescope · observatory · flux · starlight · celestial · radiance · brightness · astrophysics
Light-measuring analytical instrument
- colorimeterDevice measuring color intensity
- radiometerRadiant energy measuring device
- densitometerOptical thickness measuring device
- photodiodeLight-to-current semiconductor
photoelectric · filter · aperture · optical
Implementing uniform technical specifications
- referenceDirecting attention elsewhere
- zeroingCalibrating to baseline
- accuracyDegree of correctness
- precisionAccuracy of measurement
linearity · traceability · gain · offset · drift · stability · repeatability · standard lamp
lux
SI illuminance unit
- fluxContinuous change or flow
- intensityStrength or force level
- irradianceIncident power per area
illuminance · candela · lumen · transmittance · absorbance · reflectance · wavelength · detector · sensor · readout
spectroscopy
Study of light-matter interaction
- magnitudeSize or scale
- stellarOf or like celestial bodies
- luminosityIntrinsic brightness of source
redshift · telescope · observatory · flux · starlight · celestial · radiance · brightness · astrophysics · variable star
spectrophotometer
Light-measuring analytical instrument
- colorimeterDevice measuring color intensity
- radiometerRadiant energy measuring device
- densitometerOptical thickness measuring device
photodiode · photoelectric · filter · aperture · optical
standardization
Implementing uniform technical specifications
precision · linearity · traceability · gain · offset · drift · stability · repeatability · standard lamp · certification
incident
A distinct event
f-stop · ISO · dynamic range · highlight · shadow · ambient light · studio
- detectorsmetal detector, smoke detector, motion detector, heat detector, lie detector
- measuring devicesscale, yardstick, ruler, tape measure, measuring tape
- astronomy toolstelescope, binoculars, star chart, star map, planetarium
- metersodometer, pedometer, altimeter, voltmeter, ammeter
- sensorsbiosensors, temperature sensor, pressure sensors, heat sensor, ammeter
- Lab Analysisspectrometer, spectrophotometry, spectroscopy, colorimeter, absorbance
photometerspectrometer
Measures electromagnetic radiation properties
spectroscope · spectrograph · radiometer · spectrophotometer · radio telescope
photometeraudiometer
Hearing measurement device
thermometer · barometer · hygrometer · anemometer · seismometer