Bentham's IDR300-PSL is a fully automated, double monochromator based spectroradiometer system for the hazard classification of lamps in accordance with CIE S 009/E:2002 Photobiological Safety of Lamps and Lamp Systems. Such systems require high spectral resolution over a wide wavelength range (200nm to 3000nm) and must have excellent stray light rejection. Bentham offers a very high precision cosine response diffuser (f2 error <1%) or integrating spheres for spectral irradiance measurements and a variable aperture telescope for radiance measurements. Exposure limits are determined by software.

 
Skin or cornea hazard
Actinic UV skin & eye
ES
200-400nm
Eye UV-A
EUVA
315-400nm
Blue light small source
EB
300-700nm
Eye IR
EIR
780-3000nm
Skin thermal
EH
380-3000nm
Retinal hazard
Blue light
LB
300-700nm
Retinal thermal
LR
380-1400nm
Retinal thermal (weak)
LIR
780-1400nm

In consideration of six hazards to the skin and eye, measurements of spectral irradiance are performed over the range 200-3000nm and spectral radiance 300-1400nm.

At the heart of the system is the IDR300 integrated double spectroradiometer combining:

  • flexibility of turret-mounted diffraction gratings for uninterrupted measurement over a wide spectral range
  • motorised slits to vary instrument bandwidth over the measurement range
  • stray light performance of a double monochromator, a key factor in the UV region
  • integrated DC electronics
  • 3 detector ports
  • fully computer-controlled through Windows application, BenWin+
  • USB interface

 

According to the measured quantity, the appropriate input optic should be used to define the geometry of measurement from which light is coupled into the spectroradiometer.

To measure spectral irradiance, we require an input optic to measure light arriving from the entire hemisphere above the measurement plane. The D7 diffuser, having the exceptionally low cosine error of f2<1%, accurately measures this quantity over the range 200-1100nm.

To measure spectral radiance, we require an input optic to measure in a given field of view to mimic the imaging function of the human eye. According to the standard, there are three key fields of view, two of which are measured with the TEL309 telescope.

TEL309 TelescopeD7 Diffuser

In order to achieve both given field of view and use over the range 200mm to several metres, the TEL309 consists of a motorised relay optic and wheel of apertures with a USB camera viewer for the user to view the FOV.