Radiometer UVB Sensor measures UVB penetration into fresh or salt water
Features & Applications: The Radiometer
UVB Sensor gives an accurate measurement of the biologically weighted
ultraviolet radiation from sunlight, also called sunburning UV
radiation (SUV). Its spectral response follows closely the erythema
action spectrum [1].
Measurements
taken with the PMA2104 are comparable to those made by submersible
spectroradiometers. The damaging effects of UV-B in the marine
environment has been shown for phytoplankton [2], algae, and
fish [3].
The UVB Sensor
is waterproofed, and can be safely submerged up to 100 meters.
The detector's housing is rugged and easy to handle in a harsh
environment. Two #10-32 taped holes on the bottom of the detector
housing allow for attachment of lowering cables or handles to
the detector so its position can be established and maintained.
The weight of the detector is sufficient for easy submersion.
The
biologic effectiveness of the UV radiation can be measured in
terms of effective irradiance in radiometric units, for example
[µW/cm2]. It is often related to the sensitivity of the
human skin to sunburn and expressed in Minimal Erythemal Doses
per Hour [MED/Hr]. One MED/Hr is the effective irradiance capable
of causing minimum redness (erythema) in an average number 2
skin. Based on a study [4], the relationship between MED/Hr and
radiometric units was determined to be:
1 [MED/Hr] =
5.833 [µW/cm2]
The integrated
effective dose can be expressed in [mJoules/cm2] or MED. It takes
1/2 hour to accumulate 1 MED when the subject is exposed to an
irradiance of 2 MED/Hr.
Sea level solar
radiation under 3mm total ozone column, clear sky:
overhead sun:
approx. 0.32 W/m2 (5.5 MED/Hr)
30° SZA:
approx. 0.25 W/m2 (4.3 MED/Hr)
60° SZA:
approx. 0.05 W/m2 (0.9 MED/Hr)
Features:
- NIST Certification
- Takes measurement
of ultraviolet radiation from sunlight
- Measures UVB
penetration into fresh or salt water
- Waterproof,
and can be safely submerged up to 100 meters
- Rugged housing
- Needs to be
used with radiometer
Spec
Summary:
Angular
response: |
15%
for angles <50° |
Range: |
20 [MED/Hr],
1,17 [µW/cm2] |
Display
resolution: |
0.001 [MED/Hr], 0.01[µW/cm2] |
Operating
environment: |
32 to 120 °F (0 to +50 °C)
no precipitation |
Temperature
coefficient: |
1% /°C for solar radiation |
Cable: |
35ft, (10.6m) Waterproof
7pin keyed |
Diameter: |
W/O Cable5.5" (139.7 mm) |
Height: |
3.5" (88.9 mm) |
Weight: |
W/O Cable48 oz. (1360 grams) |
|
