photometry
Noun: 1. The measurement of the properties of light, especially its intensity: Photometry is the branch of science concerned with measuring the visible characteristics of light, such as its brightness or luminous intensity, as perceived by the human eye. It is distinct from radiometry, which measures the total power of light (including invisible wavelengths).
Photometry is used in various scientific, industrial, and commercial fields to quantify and standardize light. - It is essential in astronomy for measuring the brightness of stars and other celestial objects. - It is applied in lighting design and engineering to assess the efficiency and output of light sources like LEDs and lamps. - It is used in photography and imaging to calibrate equipment and ensure accurate exposure.
- Scientific Context:
- Astronomers use photometry to determine the magnitude of a variable star over time.
- The laboratory specializes in the photometry of LED lighting to ensure they meet industry standards.
- General Context:
- Accurate photometry is crucial for designing street lighting that is both effective and energy-efficient.
- Differential Photometry: A technique used in astronomy to measure the change in brightness of an object by comparing it to nearby stars of known, constant brightness.
- Flicker Photometry: A method where an observer adjusts the brightness of two alternating light sources until they appear to match, used in vision science.
- Photometer (noun): An instrument used for making photometric measurements.
- The technician used a photometer to measure the illuminance on the work surface.
- Photometric (adjective): Relating to or involving photometry.
- The study presented a detailed photometric analysis of the galaxy cluster.
- Spectrophotometry (noun): The quantitative measurement of light intensity as a function of wavelength, combining principles of spectroscopy and photometry.
- Light measurement: A general term for the act of measuring light.
- Luminosity measurement: Specifically refers to measuring the intrinsic brightness of a light source.
- Luminous Flux: The total perceived power of light emitted by a source, measured in lumens (lm). This is a key quantity in photometry.
- Illuminance: The amount of luminous flux incident on a surface per unit area, measured in lux (lx). It describes how much light falls on a surface.
- Luminous Intensity: The power of a light source in a particular direction, measured in candelas (cd). This is the core property referenced in the primary definition.
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measurement of the properties of light (especially luminous intensity)
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