Light Measurements

      ​The "Light Measurements" department at the National Center for Measurement and Calibration consists of three laboratories: light radiation laboratory, light measurements laboratory, and spectroscopy laboratory. This administration is concerned with establishing and preserving the primary national measurement standards, Mainly, is the initial standard for illumination intensity that achieves one of the seven basic units in the International System of Units (SI), which is the candle (candela), defined as the intensity of illumination in a specific direction for a source that radiates monochromatic light with a frequency ( 540 x 1014 Hertz and has an intensity of radiation in this direction of (1/683) watts per stradian.

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      The aim of establishing the optical radiation laboratory is to achieve and maintain the Saudi national standards in the field of optical radiation measurements, which are the spectral response measurement standard and the optical power measurement standard, which is responsible for calibrating all devices (optical detectors (semiconductors), laser power detectors, power meters, optical filters and a meter. Wavelength for spectroscopy devices and radiometric spectroscopy devices - Spectroradiometers) and has the following measurement capabilities:​

Measurement and calibration capabilities:​

Calibration and Measurement Capab​ility  (CMC)، k=2RangeQuantity measured / Calibrated Instrument

1.3 %  to  1.86 %

(wavelength and sample-dependent)

10-04 A/W to 1.5 A/W

(Spectral range: 250 nm to 1800 nm)

Responsivity

Spectral, Power

Broadband detectors



1.32 % to 2.26 %​

Power: 10-05 W to 1 W

(at laser wavelengths 488 nm, 515 nm, 532 nm, 633 nm and 1064 nm)

Responsivity,

Laser,

Power

(Calibration Factor)​​


      The aim of establishing the light measurements laboratory is to achieve and maintain the Saudi national standards in the field of photometric measurements (measurements of visible radiation), which are the standard for measuring the "light intensity" of the lamp and the standard for measuring light flux and luminance intensity, and the laboratory is responsible for calibrating all devices (reference sources of light intensity, sources Luminous flux reference, reference brightness sources, color temperature gauges, color nuances, and luminance meters - laximeter / lightmeter).

Measurement and calibration capabilities:

Calibration and Measurem​ent Capability (CMC)، k=2RangeQuantity measured / Calibrated Instrument

1 %

(at 2856 K)

1 cd to 104 cd

Luminous Intensity

1 %

(at 2856 K)

0.1 lx to 5000 lx

Illuminance

1.6 %

(at 2856 K)

Luminance meter: 15 cd/m2 to 2800 cd/m2

Luminance Source: 15 cd/m2 to 5000 cd/m2


Luminance

2 %

(at 2856 K)

5 lm to

5000 lm


Luminous Flux​

The laboratory takes care of establishing and maintaining national, reference and working standards for measuring the following quantities: reflectivity, transmittance, absorbance and opacity. In addition to achieving standard wavelength for spectroscopy devices. The laboratory calibrates high-precision measuring devices related to these physical quantities, for example: spectrophotometers, optical filters, reflective, permeable and semi-permeable samples, transmittance, opacity, gloss and cloudiness measuring devices, colorimeter devices, color difference parameters and measuring devices the degree of whiteness and yellowness. The laboratory provides large-scale calibration services inside and outside the laboratory as well as technical and scientific consulting and training in laboratory fields/activities.

Measurement and calibration capabilities:​

Calibration and Me​asurement Capability (CMC)، k=2RangeQuantity measured / Calibrated Instrument

0.3 % to 1.0 %

(wavelength and sample dependent)

10-03 to 1.0

(Spectral range: 250 nm to 1800 nm)

Transmittance,

Regular, Spectral

0.3 % to 1.0 %

(wavelength and sample dependent)

10-03 to 1.0

(Spectral range: 250 nm to 1800 nm)

Transmittance,

Diffuse, Spectral

0.3 % to 1.0 %

(wavelength and sample dependent)

10-03 to 1.0

(Spectral range: 250 nm to 1800 nm)

Reflectance,

Regular, Spectral

0.3 % to 1.0 %

(wavelength and sample dependent)

10-03 to 1.0

(Spectral range: 250 nm to 1800 nm)

Reflectance,

Diffuse, Spectral

0.3 % to 1.8 %

(wavelength and sample dependent)

10-03 to 1.0

(Spectral range: 250 nm to 1800 nm)

Transmittance,

Total, Spectral

0.3 % to 1.8 %

(sample dependent)


0 to 3

Optical Density (OD)

Wavelength accuracy: 0.2 nm

Photometric accuracy: 0.1% to 2%​

Wavelength scale: UV-VIS-NIR

Photometric scale: 0.04 to 2.0 AU

Spectrophotometer,

UV-VIS-NIR​




Last modified 01 Oct 2020
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