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Photopic Light
Detector |
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FEATURES
 | High sensitivity |
| Wide dynamic range |
| Excellent long term stability |
| Cosine corrected |
| NIST traceable calibration |
| Selectable units |
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| The PMA2130 is a portable illumination
detector (Lux detector) with spectral response following the CIE photopic action spectrum.
This detector is designed to have a spectral response like that of the human eye’s
visual response in the photopic region. |
APPLICATIONS
| Environmental monitoring |
| Industrial and laboratory safety |
| Industrial and residential lighting |
| Art and museum maintenance |
| Photography and film studios |
| Clinical studies |
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| The spectral response of
the human eye changes with light intensity. The eye has two distinctive
spectral responses, which are defined according to the brightness of the
light entering the eye. The first spectral response of the eye occurs
under typical daytime lighting conditions (photopic) defined for light
intensity greater than 0.1 Lux. The second spectral response occurs under
low light conditions (scotopic) defined for light intensity between 0.01
and 0.0001 Lux. Light intensity less than 0.0001 Lux is undetectable by
the human eye. The eye's shift from the photopic response to the scotopic
response is know as the Purkinje shift. The photopic spectral
luminous efficiency curve peaks at 555nm and it is normalized to 1 at that wavelength.
The power-like unit of brightness-sensation-producing ability of light is Lumen [lm].
The relationship between effective Watts and Lumen has changed several times during 20th
century and it is now assumed to be 683 lm/W. For example, 555-nm monochromatic radiation
flux of 1W would carry the luminous flux of 1 lm. Please note, that scotopic spectral
luminous efficiency as well as the conversion factor between Watts and scotopic lumens
differ from their photopic counterparts.
The illumination (illuminance) is measured in luminous flux per unit
area. The following units are commonly used:
1 lumen/cm2 = 1 phot
(ph)
1 lumen/ft2 = 1 foot-candle
(ft-cd)
1 lumen/m2 = 1 lux (lx)
with ft-cd and lux dominating in the field.
The PMA2130 detector has a Teflon diffuser assuring an angular response close to the
cosine function (Lambertian response). It is of particular importance when measuring
radiation flux from extended sources or from sources positioned at an angle to the axis of
the detector. |
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SPECIFICATIONS |
| Spectral response |
Follows CIE photopic
spectral luminous efficiency curve (400-700nm) Figure 1 |
| Angular response |
5% for angles <60° |
| Range |
PMA2130 - 150,000 Lux,
220 W/m2, 14,000 ft-cd
PMA2130L
- 1,500 Lux, 2.2 W/m2, 140 ft-cd
PMA2130H
- 1,500,000 Lux, 2200 W/m2, 140,000 ft-cd |
| Display resolution |
PMA2130 - 1 Lux,
0.001 W/m2, 0.1 ft-cd
PMA2130L
- 0.01 Lux, 0.00001 W/m2, 0.001ft-cd
PMA2130H
- 10 Lux, 0.01 W/m2, 1 ft-cd |
| Operating environment |
32 to 120 °F (0 to
+50 °C) no precipitation |
| Cable |
1ft, retractable to
5ft (0.3m/1.5m) |
| Diameter |
1.6" (40.6 mm) |
| Height |
1.8" (45.8 mm) |
| Weight |
7.1 oz. (200 grams) |
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Analog versions of this detector are available See PMA1130
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Return to Detector Selection Guide
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