Radiometer Photopic Sensor is used with the Solar Light UV Radiometers
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) |
|
