The Barnes Modular Multispectral Radiometer (MMR) is a portable battery operated instrument containing eight simple independent optically-chopped radiometers. The instrument has four channels in the visible spectrum, three channels in the shorter infrared spectrum and one in the longer infrared spectrum. Wavebands 1-4 have silicon detectors, wavebands 5-7 have lead sulfide detectors and waveband 8 has a Lithium Tantalum trioxide detector.
| Channel | Wavelength Range (microns) |
|---|---|
| 1 | 0.45 - 0.52 |
| 2 | 0.52 - 0.60 |
| 3 | 0.63 - 0.69 |
| 4 | 0.76 - 0.90 |
| 5 | 1.15 - 1.30 |
| 6 | 1.55 - 1.75 |
| 7 | 2.08 - 2.35 |
| 8 | 10.40 - 12.50 |
The MMR's dimensions are 26.4 cm by 20.5 cm by 22.2 cm, and it weighs 6.4 kg.
The field of view of each channel is 1o, 15o or 120o via user selectable lens combinations.
The output signals have a range from 0V to +5 V and each channel is calibrated against known standards. Accuracy is 2% or better. There are gain switches for all but the long-wave channel (Channel 8) 0.2, 0.5, 1.0, 1.5, 2.0, 3.0, 5.0.
Power requirement is 12 VDC at about 0.4 ampere and may be provided either from a belt pack for hand-carrying or a from vehicle power through a long cable. Two 5AH lead-acid batteries provide for 10 hours of endurance and a 6-hour charger is supplied.
The instrument is dust-tight and designed to withstand shock and vibration encountered when carried by a helicopter or on a truck-mounted boom. It will operate within the specifications in ambient temperatures from 0oC to 60oC, humidity from 0 to 95% and will tolerate full solar full solar radiation including being aimed directly at the sun.
Manufacturer
Barnes Engineering Company30 Commerce Road
Stamford, CT 06904
Phone: 203-348-5381
MMR is no longer in production