Test sphere

Equipment package for measuring light flux and photobiological parameters of light sources

Project title

Equipment for measuring light flux and photobiological parameters of light sources.

Project execution time

Project start: 11/11/2014, Project completion date: 02/10/2015

Customer

Belarusian State Institute for Standardization and Certification

PROJECT GOALS
AND OBJECTIVES

Workstation is designed for automated measurements of light flux and photobiological parameters of light sources in accordance with the requirements of IEC 62471 and IEC 62778.

The equipment can be used in the following cases:

  • in measuring and certification laboratories and centers;
  • during mass production and control of lighting equipment parameters;
  • during the prototypes development of new lighting equipment.

The Belarusian State Institute for Standardization and Certification got the opportunity to perform light equipment tests (lamps, luminaires, lights) on energy efficiency parameters, energy consumption and light parameters.

PROJECT TECHNICAL
DESCRIPTION

The workstation includes a measuring sphere with a diameter of 2 m, a spectrophotometer equipped with a grating, a set of filters, a set of detectors and a set of reference lamps and adapters.

To measure light flux and photobiological parameters of light sources, the equipment under test is placed inside a specialized calibrated sphere.

The equipment is connected to the network and configured for operation in the nominal mode. Using special software, a set of filters and detectors, spectrophotometer measures various parameters of light, for example, levels of photobiological safety of lamps and lamp systems, level of lamp’s light flux, and overall spectral density of the lamp’s light flux.

The measuring equipment is powered from a single phase 230 V, 50 Hz network.

Power consumption less than 200 VA.

The measuring sphere consists of two halves, which are connected by a swivel joint. The overall dimensions of the spheres can be altered at the customer’s request and can reach the diameter up to 2.5 meters. The workstation is fully automated and allows automatically perform all measurements of light parameters and generate reports and protocols based on prepared templates.

OPERATING
PRINCIPLE

The basis of the workstation is the measuring sphere and spectrophotometer.

Measuring sphere is designed to measure the total spectral density of the light flux emitted by a wide range of sources. The inner surface of the sphere is covered with barium sulfate to ensure uniform reflection of the light flux inside the sphere. There are two fixing points in the construction of the sphere: height-adjustable. The upper point for accurate installation of the lamp being measured and the lower point for installation the reference lamp.

The detector port with mounted detectors is located on the pole of the fixed hemisphere. The internal shield protects the detector against direct light.

Furthermore, front hemisphere contains an additional lamp, which allows you to assess the impact of sphere itself to the measurement, and compare it with the impact of a standard calibration lamp. The detected signal is fed to a spectrophotometer to measure the parameters of the light flux using specialized software.

SYSTEM
SPECIFICATIONS
PARAMETER VALUE
Measuring sphere with a diameter 2 m
Operating wavelength 350-1100 nm
Light flux measurement range 0,01 lm ÷ 1999900 lm
Accuracy of light flux measurement ± 2%
Spectrophotometer
PARAMETER VALUE
Spectral range 180-3000 nm
Frequency grid step 5 nm
The ratio of the energy outside the band to the energy in the pass band at a wavelength of 270 nm for tungsten or tungsten-halogen calibration lamps less than 10-4
Bandwidth (FWHM): 200 ≤ λ ≤ 400: ≤ 4 nm
400 ≤ λ ≤ 600: ≤ 8 nm
600 ≤ λ ≤ 1400: ≤ 20 nm
1400 ≤ λ: without limitations
Wavelength setting accuracy: 200 ≤ λ ≤ 300: ± 0,2 nm
300 ≤ λ ≤ 325: ± 0,1 nm
325 ≤ λ ≤ 600: ± 0,2 nm
600 ≤ λ ≤ 1400: ± 2 nm
Presence of LUX detector f1 < 3 %
WORKSTATION
STRUCTURE
DESCRIPTION
Measuring sphere with a diameter of 2 m, operating wavelength: 380 nm ÷ 780 nm
The ISR300 spectrophotometer is based on a monochromator equipped with a T312R0U5 diffraction grating, OS400 and OS700 order sorting filters, a transimpedance amplifier with a double input signal and a high-voltage power supply.
Set of detectors (180 ÷ 3000 nm):

  • Photocathode
  • Silicon photodiode
  • nGaAs detector head with lens
Multiplier phototube DH-30
Silicon photodiode DH- Si
High-precision photometric detector DH400-VL
Fiber optic cable FOP-2-IDR
Adapter for fiber optic cable ISR300
DC Power Supply for Lamp Supply
Reference lamp, 2 pcs
A set of lampholders and fixtures for lamps
Optical Telescope
Software
Personal computer, printer
Desk, operator’s chair
RELATED
STANDARDS
SHORT DESIGNATION FULL TITLE
IEC/EN 62471 Photobiological safety of lamps and lamp systems
IECTR 62778 Household electric cooking appliances – Part 1: Ranges, ovens, steam ovens and grills – Methods for measuring performance
GOST R IEC62471-2013 Photobiological safety of lamps and lamp systems.
IEC TR 62778:2014 Application of IEC 62471 for the assessment of blue light hazard to light sources and luminaires
CIE 63-1984 CIE 63-1984, The spectroradiometric measurement of light sources
CIE 105-1993 CIE 105-1993, Spectroradiometry of pulsed optical radiation sources

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