These radiometers are available with 4 individual channels, essentially multiple sensors in one housing. Sensors intended for measuring downwelling or incident radiation are fitted with a cosine correcting head. Sensors supplied for upwelling or reflected light receive radiation from a narrow 25° cone, enabling measurements from a defined area. Other acceptance angles are available on request.
Usually a pair of sensors with identical wavebands are used to measure incident and reflected light simultaneously, to eliminate variations in natural solar radiation during measurement. Sensors can be mounted on meteorological or CO flux towers for long 2 term monitoring, and are light enough to be used on aircraft for larger scale studies.
Skye's calibration facility scope is between 280 and 2400 nm, with bandwidths from 5 nm to several hundred nm (broadband). The SKR 1860 series sensors can be ordered with the user's choice of wavebands in the VIS and NIR ranges between 400-2400nm. Once the wavebands are fitted and calibrated, they are not changeable by the user. Popular choices include Red & Far-Red, Red & Near Infra Red or channels matching satellite bands for ground truthing.
|Range||4 channels individually chosen at time of ordering between 400-2400 nm. Bandwidths from 5nm to several 100 nm|
|Construction||Plain anodised aluminium housing Cosine correcting head for incident. Waterproof rating IP65, fully weatherproof. Regular maintenance required to keep light collecting surfaces clean and free from obstruction, e.g. dust, moisture, algae etc|
|Filters||Metal interference and/or glass depending on wavelengths & bandwidths chosen, to military spec|
|Cable||Screened military specification. 3m. Standard length.|
|Output||SKR 1860D/ND - current output (nA) which varies with filters used.|
|Response Time||SKR 1860D/ND - typically less than 100 nanoseconds.|