Goniophotometer

Manual (1), and Mitscherlich's optical (2) goniometers for use in crystallography, c. 1900

A Goniophotometer is a device used for measurement of the light emitted from an object at different angles.^[1] The use of goniophotometers has been increasing in recent years with the introduction of LED-light sources, which are mostly directed light sources, where the spatial distribution of light is not homogeneous.^[2] If a light source is homogeneous in its distribution of light, it is called a Lambertian source.^[3] Due to strict regulations, the spatial distribution of light is of high importance to automotive lighting and its design.

^ Marx, P. (1997). "New goniophotometers for light-engineering laboratories" (PDF). Light & Engineering. 5 (4): 32–36.
^ Lindemann, Matthias; Maass, Robert (15 December 2009). "Photometry and colorimetry of reference LEDs by using a compact goniophotometer". MAPAN. 24 (3): 143–152. doi:10.1007/s12647-009-0018-6. S2CID 108700502.
^ Palmer, James (2010). The Art of Radiometry. Bellingham, Washington: SPIE. p. 27. ISBN 9780819472458.

[1] Marx, P. (1997). "New goniophotometers for light-engineering laboratories" (PDF). Light & Engineering. 5 (4): 32–36.

[2] Lindemann, Matthias; Maass, Robert (15 December 2009). "Photometry and colorimetry of reference LEDs by using a compact goniophotometer". MAPAN. 24 (3): 143–152. doi:10.1007/s12647-009-0018-6. S2CID 108700502.

[3] Palmer, James (2010). The Art of Radiometry. Bellingham, Washington: SPIE. p. 27. ISBN 9780819472458.

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