Skip to Content

Radiometers

Calibration of the spectral responsivity of broadband filter radiometers and photometers over the ultraviolet and visible wavelength range (250nm to 800nm). Typical calibrations are made at 1nm wavelength intervals and with a 1nm bandwidth. Examples of UV meters calibrated include International Light, Robertson Berger and Eppley radiometers.

Calibration of radiometers used for measurement of irradiance at a wavelength of 365nm. Examples of radiometers calibrated include Blak-Ray and Spectroline.

Calibration of germicidal radiometers used for measurement of irradiance at 254nm.  Examples of radiometers calibrated include UVX, International Light, and Lutron.

Calibration of pyronometers using one kilowatt tungsten lamps over the wavelength range 250nm to 2500nm.

Spectroradiometers

The spectral responsivity of a spectroradiometer is calibrated using one kilowatt spectral irradiance lamps over the wavelength range 250nm to 1600nm. The wavelength scale is calibrated using a number of emission lines from a mercury-cadmium discharge lamp.

Light Sources

The spectral irradiance of lamps is calibrated using a calibrated spectroradiometer over the wavelength range 250nm to 830nm.

The highest accuracy calibrations can be done by direct comparison with a NIST calibrated spectral irradiance lamp using our lamp comparitor system.

Materials

Ultraviolet Protection Factor

UPF is a measure of the protection against ultraviolet radiation provided to the skin by a fabric relative to unprotected skin. Measurements are made as outlined in Australian/ New Zealand standard AS/NZS4399:1996 Sun protective clothing – Evaluation and classification. A 30 cm length of cloth is required for testing, or on a product basis we can tell you how many products we need for testing.  A spectroradiometer, integrating sphere and Xe arc lamp are used to measure the diffuse transmittance of four areas of the sample over the wavelength range 290nm to 400nm at 1nm intervals.

For more information, please download the UPF brochure here... (PDF 125.95KB)

Back to top >>

This data is used to calculate the UPF value of the fabric and the results are presented as being within one of the following categories:

UPF Range Protection Category
15-24 Good Protection
25-39 Very Good Protection
40-49 and 50+  Excellent Protection

The cost for the first 5 samples is $600.  Each additional sample thereafter will cost an additional $95 each. 

These prices exclude GST and are valid from 1 December 2010.  They are based on plain fabric - patterned fabric may require extra tests.

Shadecloth

The ultraviolet–visible transmittance of shadecloth samples is measured using a spectroradiometer, integrating sphere and Xe arc lamp light source. Measurements are made at 10nm wavelength intervals from 290nm to 770nm and the following transmittance expressions are calculated as outlined in Australian / New Zealand Standard AS/NZS 4174:1994 Synthetic Shadecloth:

  • Average percentage transmission
  • Shade factor
  • Average percentage UVR transmission
  • Average percentage PAR transmission
  • Percentage UVR block.

Cover Factor can also be determined as outlined in Appendix A of the standard.

For more information, please download the shadecloth brochure here... (PDF 106.69KB)

Contact details

For information on these services please contact Neil Swift.

Back to top >>