Features & Applications:
The Radiometer Photopic Sensor is a portable illumination sensor (Lux detector) with spectral response following the CIE photopic action spectrum. This Photopic Sensor is designed to have a spectral response like that of the human eye's visual response in the photopic region.
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 known 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 sensor 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.
Features:
- NIST Certification
- High sensitivity
- Wide Dynamic range
- Excellent long term stability
- Cosine corrected
- Selectable Units
- Meets ICH guidelines for photostability testing
- Needs to be used with a Radiometer
Applications:
- Environmental monitoring
- Industrial and laboratory safety
- Industrial and residential lighting
- Art and museum maintenance
- Photography and film studios
- Clinical studies
- Photostability testing
Spec Summary:
|
Spectral
response: |
Follows CIE photopic spectral luminous
efficiency curve (400-700nm) |
|
Angular response: |
5% for angles <60° |
|
Range: |
150,000 Lux, 220 W/m2, 14,000 ft-cd |
|
Display
resolution: |
PMA2130 - 1 Lux, 0.001 W/m2, 0.1 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) |
Radiometer Photopic Sensor with NIST Certification
