Enviro300 Wide Spectral Range Solar Spectroradiometer

  • Wide spectral range thermally controlled solar spectroradiometer

The Enviro300 may be operated unattended via the BenWin+ software suite, recording spectra as often as every five minutes in some of the most inaccessible environments on earth over extended periods.

The system is based around the compact 600mm focal length DTMc300 (280-2500nm) double monochromator, with photomultiplier detection, detection electronics and a choice of input optics.

Core benefits


  • Windows control software provides full automation via USB 2.0
  • Measurements traceable to Physikalisch-Technische Bundesanstalt (PTB, Germany)
  • Two-stage Peltier cooling (and associated fan) assembly are used to stabilise the temperature
  • The UV irradiance standard of this system is the Bentham CL7 enclosed Deuterium lamp with its associated 708 power supply
  • Full detection electronics suite


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

Monochromator Specifications

Optical layout

Configuration Pair symmetrical Czerny Turner monochromators arranged for either additive or subtractive dispersion
Focal length Total focal length: 600mm (additive)
Individual Units: 300mm
Grating mount Triple grating turret
Number of gratings 1-3
Grating size 68 x 84mm
Aperture ratio f/4.1 (at all grating angles)
Number of entrance/ exit ports 1 or 2 in both monochromators


Mechanical resolution drive 0.000072°/ step
Slit type Fixed, micrometer or motorised variable
Slit width & height 10µm-10mm (W) x 20mm (H)
Filter size 23/25mm diameter

Optical performance (quoted for 1200 g/mm grating)

Spectral range Within range 200nm-50µm
Linear dispersion 1.35nm/mm (additive)
Wavelength accuracy ± 0.1nm
Wavelength reproducibility ± 0.025nm
Resolution full/reduced slit height 0.15/0.05nm
Stray light rejection at 2.5 FWHM 10-8
Wavelength acquisition speed 2000nm/s


Computer interface USB 2.0
Software control BenWin+ / SDK

Electrical / Mechanical

Overall dimensions 620L x 340W x 205H (mm)
Optical height 115mm
Weight 28 kg
Power supply Mains input 110/220V 50/60Hz

Operational set-up

Wavelength range Components Bandwidth
280-400nm PMT, 2400g/mm 0.5
400-600nm PMT, 1200g/mm 1
600-1100nm Silicon, 1200g/mm 5

Envirobox Specifications

Mechanical & Interface

Overall dimensions 1050L x 760W x 485H (mm)
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

Direct solar accessory Fibre-coupled
Two integrating spheres Fibre-coupled


Bi-alkali photomultiplier tube (PMT) (200-~650nm) Requires 215 modular high-voltage PSU
Silicon detector (250- 1100nm)
Lead Sulphide (PbS) (~800-~3000nm)

Calibration standards

CL6 UV-vis-IR 150W quartz halogen irradiance standard, requires 610 PSU
CL7 UV deuterium irradiance standard, requires 708 PSU
CL_Hg UV-vis-IR 1KW irradiance standard (Refer to Gigahertz Optik documentation.)
*two adaptor plates are provided for attachment of the input optics

Detection electronics

417 Detection electronics sub-rack, power supply and display
462 Relay module
467 DC current amplifier
215 High voltage supply
496 Lock-In amplifier
418M Chopper control electronics
CPS1M Peltier cooler power supply


Enviro150 DMc150 monochromator for narrow range measurements; 280-600, 300-1100nm
Enviro300 DTMc300 for wide range measurements 280-2500nm
Global Diffuser on Rotating Shadow Band with no shadow
Diffuse Measurement of diffuse solar irradiance, using rotating shadow band
Diffuser on RSB with shadow
Direct Measurement 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_150 Spectroradiometer solution featuring DMc150 monochromator for narrow range measurements; 280-600, 300-1100nm
Enviro_300 Spectroradiometer solution featuring DTMc300 monochromator for wide range measurements 280-2500nm

Share this:

The Bentham Standard

We’re with you from the first call to the final result

Call us on +44 118 975 1355 or email us

You are currently offline. Some pages or content may fail to load.