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

Features

  • 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

Applications

  • 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 additive dispersion

Focal length

Total focal length: 300mm

Individual Units: 150mm

Grating mount

Kinematic mount

Number of gratings

1 pair see separate Diffraction Gratings datasheet for full range)

Grating size

33x33mm

Aperture ratio

f/4 (at all grating angles)

Number of entrance/exit ports

1/2 or 2/1

Opto-mechanical

Mechanical resolution drive

0.000072°/step

Slit type

Fixed, micrometer or motorised variable

Slit width & height

10µm-8mm (W) x 20mm (H)

Filter size

25mm diameter

Optical performance (quoted for 1200 g/mm gratings)

Spectral range

Within range 200nm-2500nm

Linear dispersion

2.7nm/mm

Wavelength accuracy

± 0.3nm, ± 0.05nm with software correction

Wavelength reproducibility

± 0.05nm

Resolution full/reduced slit height

0.5/0.1nm

Stray light rejection at 2.5 FWHM

10-8

Wavelength acquisition speed

30nm/s

Automation

Computer interface

USB

Software control

BenWin+/SDK

Electrical / Mechanical

Overall dimensions

440L x 310W x 185H (mm)

Optical height

128.9mm

Construction

Single machined casting

Weight

12 kg

Power supply

Mains input 110/220V 50/60Hz

Envirobox Specifications

Mechanical & Interface

Overall dimensions

755L x 750W x 480H (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

Optic

Details

Bentham D6QA_C

D6QA_C quartz-domed cosine response diffuser, and fibre bundle for measurement of global solar irradiance.

Dry air pump

Re-circulates air to prevent condensation on the quartz dome of the diffuser

Detectors

Detector

Details

Bi-alkali photomultiplier tube (PMT)

(200-~650nm) Requires 215 modular high-voltage PSU

Calibration Standards

Calibration standard

Details

CL7

UV deuterium irradiance standard, requires 708 PSU

Detection Electronics

417

Detection electronics subrack, power supply and display

487

Combined current amplifier and analogue-digital converter

215

Modular, high voltage PSU

Options

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

DMc150 monochromator for narrow range measurements; 280-600, 300-1100nm

Enviro_300

DTMc300 for wide range measurements 280-2500nm

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