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Enviro150 Solar Spectroradiometer

  • Thermally controlled solar spectroradiometer

A comprehensive software suite permits optimal operation of the Enviro150 locally or whilst unattended, recording spectra up to every five minutes in some of the harshest measurement conditions over extended periods.

The system is based around the compact 150mm focal length DMc150 (280-600/ 300-1100nm) with photomultiplier detection, detection electronics and a choice of input optics.

Core benefits


  • Temperature controlled measurement enclosure for outdoor use
  • Compact double monochromator based spectroradiometer
  • Fibre bundle light transport to spectroradiometer
  • Range of entrance optics
  • Fully autonomous operation via BenWin+ Windows control software providing full automation


  • Solar irradiance monitoring
  • Data input to climate modelling
  • Ozone column and aerosol optical depth measurements

Monochromator Specifications

Optical layout

ConfigurationPair symmetrical Czerny Turner monochromators arranged for additive dispersion
Focal lengthTotal focal length: 300mm
Individual Units: 150mm
Grating mountKinematic mount
Number of gratings1 pair see separate Diffraction Gratings datasheet for full range)
Grating size33x33mm
Aperture ratiof/4 (at all grating angles)
Number of entrance/exit ports1/2 or 2/1


Mechanical resolution drive0.000072°/step
Slit typeFixed, micrometer or motorised variable
Slit width & height10µm-8mm (W) x 20mm (H)
Filter size25mm diameter

Optical performance (quoted for 1200 g/mm gratings)

Spectral rangeWithin range 200nm-2500nm
Linear dispersion2.7nm/mm
Wavelength accuracy± 0.3nm, ± 0.05nm with software correction
Wavelength reproducibility± 0.05nm
Resolution full/reduced slit height0.5/0.1nm
Stray light rejection at 2.5 FWHM10-8
Wavelength acquisition speed30nm/s


Computer interfaceUSB
Software controlBenWin+/SDK

Electrical / Mechanical

Overall dimensions314L x 440W x 189H (mm)
Optical height128.9mm
ConstructionSingle machined casting
Weight12 kg
Power supplyMains input 110/220V 50/60Hz

Envirobox Specifications

Mechanical & Interface

Thermal control- Insulated via high density polystyrene walls
- A two-stage Peltier cooling (and associated fan) assembly stabilise the temperature
Electrical and USB connections- Electrical connection to the elements inside the Envirobox is facilitated via a distribution board fed from an external environmentally sealed plug
Fibre bundle connection- Light is transported from the input optics by a 10m quartz fibre bundle

Input Optics

Bentham D6QA_CD6QA_C quartz-domed cosine response diffuser, and fibre bundle for measurement of global solar irradiance.
Dry air pumpRe-circulates air to prevent condensation on the quartz dome of the diffuser


Bi-alkali photomultiplier tube (PMT)(200-~650nm) Requires 215 modular high-voltage PSU

Calibration Standards

Calibration standardDetails
CL7UV deuterium irradiance standard, requires 708 PSU

Detection Electronics

417Detection electronics subrack, power supply and display
487Combined current amplifier and analogue-digital converter
215Modular, high voltage PSU


Enviro150DMc150 monochromator for narrow range measurements; 280-600, 300-1100nm
Enviro300DTMc300 for wide range measurements 280-2500nm
GlobalDiffuser on Rotating Shadow Band with no shadow
DiffuseMeasurement of diffuse solar irradiance, using rotating shadow band
Diffuser on RSB with shadow
DirectMeasurement of direct solar irradiance with direct solar accessory and solar tracker
Alternate fibre input, e.g. from telescope on sun tracker for direct solar

Ordering information

Enviro_150DMc150 monochromator for narrow range measurements; 280-600, 300-1100nm
Enviro_300DTMc300 for wide range measurements 280-2500nm

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