Microtops II Ozone Monitor & Sunphotometer
Features
The Microtops II ozone monitor and sunphotometer is a 5 channel hand-held instrument for accurately measuring the ozone column (DU), ultra-violet irradiance, total atmospheric water vapour and aerosol optical thickness (AOT) at 1020nm.
The instrument includes calibrated internal temperature and pressure sensors and is supplied with a portable GPS and cable interface for automatic location setup and universal time recording. However, unlike the Facility's other MicroTops II sunphotometers this instrument has been configured with three ultraviolet detectors with narrow band precision at 305, 312 and 320nm and two near infrared detectors centred at 936nm and 1020nm.
Measured & Calculated Parameters
The following values can be read directly from the instrument or downloaded to a computer
as a tab separated
text file.
Date & time (UT)
GPS data - latitude, longitude, altitude
Solar zenith angle (SZA)
Pressure & temperature
Detector signals (mV)
Ratio of UV detector signals, 305/312 and 312/320
Standard deviation on detector signals during scan (only available from download file)
Irradiance values (W/m²)
Ozone column (in Dobson Units) calculated with 305 and 312nm data
Ozone column (in Dobson Units) calculated with 312 and 320nm data
Ozone column with compensation algorithm applied
Precipitable water column in cm
Aerosol optical thickness at 1020nm
Example Applications
Environmental monitoring
Pollution monitoring
Health care
Sunphotometry
Photobiology
Weather stations
Specification
Filters
- 305.5 ±0.3 nm, 2.0 ±0.4 nm FWHM
- 312.5 ±0.3 nm, 2.0 ±0.4 nm FWHM
- 320.0 ±0.3 nm, 2.0 ±0.4 nm FWHM
- 936 ±1.5 nm, 10 ±1.5 nm FWHM
- 1020 ±1.5 nm, 10 ±1.5 nm FWHM
Resolution
- 0.01W/m²
Dynamic Range
- >300,000
Field of View
- 2.5 degrees
Precision
- 1-2%
Nonlinearity
- max 0.002% FS
Computer & GPS interface
- RS-232C
Power source
- 4 x AA Alkaline batteries
Weight
- 21 oz (600 grams)
Size
- 10 x 20 x 4.3cm
Operating Environment
- 0 to 50°C, no precipitation
Resources
Instrument guides
Log sheet
Sample data file with ozone calculations (Excel format)
Application notes on Solar Light Co. website
Manufacturer's user manual