radiometric probe | LP UVB 02
general information:
The LP UVB 02 radiometer measures the global irradiance in the UVB spectral region on a flat surface (Watt/m2). In particular, the instrument’s spectral sensitivity is centered at 305 nm with a 5 nm band width (FWHM). The global irradiance is the sum of the direct solar irradiance and the sky diffuse irradiance on a surface parallel to the ground. In contrast to the visible spectrum where the direct component prevails over the diffuse component, in the UVB spectral region light is strongly diffused by atmosphere and thus the two components are equivalent. Therefore it is of primary importance for the instrument to be capable of measuring both components accurately.
The LP UVB 02 probe is typically used in the following sectors:
- Monitoring the ozone layer. Indeed, the radiation around 295 nm to 315 nm is strongly absorbed by ozone located in the stratosphere, therefore each small variation of the ozone layer corresponds to an increase or decrease of the radiation reaching the ground.
- Effects of UVB radiation (the most harmful to human health) on living beings.
- UVB radiation measurement in work spaces.
LP UVB 02 is robust and is manufactured to operate for long periods without maintenance (if powered correctly). This characteristic makes it suitable for location in meteorological stations. A platinum-resistance thermometer (Pt100) is inserted inside the LP UVB 02 in order to control its temperature. Internal temperature must remain within its functioning range, otherwise measurements could be affected by higher systematic errors than those asserted in the manual. Exposure to temperature higher than +60°C can alter the spectral characteristics of the interferential-filters.
UV measurement | |
typical sensitivity: | ≈5 V/(W/m2) |
response time: | <0.5 s (95 %) |
min. load impedance: | 10 kΩ |
measuring range: | 0 to 1 W/m2 |
viewing range: | 2π sr |
spectral range: | 305 nm peak 302.5 to 307.5 nm (1/2) 301 to 309 nm (1/10) 297.5 to 311.75 nm (1/100) 292.5 to 316.255 nm (1/1000) |
working temperature: | -40°C to +60°C |
response according to the cosine law: | <8 % (between 0° and 80°) |
long-term stability (1 year): | <|±3| % |
non-linearity: | <1 % |
response according to temperature: | <0.01 %/°C |
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temperature measurement | |
measuring range: | -40°C to +60°C |
accuracy: | ±0.2°C |
min. load impedance: | 10 kΩ |
power supply | |
Vdc+: | 7 to 30 V DC |
typical consumption: | 3 mA |
dimensions: | see data sheet |
weight: | 0.90 kg |
For further details p.r.t. data sheet:
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