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					                                         Applications of Optometers and Light Analyzers
                                                                                 Version 04.2009-03

                             Luminous Color Measurement




                                           Table of Contents                                  Page

                                           1.      Equipment for Luminous Color
                                                   Measurement                                    1
                                           1.1     HCT-99 Color Meter                             2
                                           1.1.1   CT-4501 Detector Head                          2
                                           1.1.2   Optional Components                            2
                                           1.1.3   Custom Labeling                                2
                                           1.2     P-9801                                         3
                                           1.2.1   CT-3701 Detector Head                          3
                                           1.2.2   Optional Components                            3
                                           2.      Luminous Color                                 4
                                           2.1     Illuminance and Color                          4
                                           2.2     Luminous Flux and Color                        4
                                           2.3     Luminance and Color                            4
                                           2.4     Luminous Intensity and Color                   4
                                           3.      Traceable Calibration                          5




                                           1. Equipment for Luminous Color Measurement

                                           To define the required quantity special equipment is de-
                                           manded. The color measurement is a difficult task which
                                           requires instruments which can simulate the human eye´s
                                           color sensation. For luminous color measurement Gigahertz
                                           -Optik instruments in combination with detector heads
                                           which are designed for this purpose.




CIE Chromaticity Diagram (Horseshoe)




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                                                  Applications of Optometers and Light Analyzers
                                                                                             Version 04.2009-03

                                     Luminous Color Measurement




                                                    1.1 HCT-99 Color Meter

                                                    The HCT-99 is a compact portable light-meter for general
                                                    lighting applications which also measures chromaticity coor-
                                                    dinates x,y and u‘,v‘ as well as correlated color tempera-
                                                    ture. The ergonomically designed meter is simple to use for
                                                    the benefit of inexperienced users.


                                                    1.1.1 CT-4501 Detector Head

                                                    A compact design, 20 mm flat tristimulus detector is de-
                                                    signed to measure broad-band light sources. Precisely cor-
                                                    rected four cell design including the Xshort function ensure
Measurement device HCT-99 for color measurement
                                                    precise luminous color measurement independent from the
                                                    light source emission spectrum.


                                                    1.1.2 Optional Components

                                                    To extend the unit’s light measurement application range
                                                    beyond luminous color, add:
                                                    • Integrating Spheres: luminous flux (calibration in lm)
                                                    • Front lens: luminance (calibration in cd/m²)
                                                    • Steradian front tube: luminous intensity (calibration in cd)


                                                    1.1.3 Custom Labeling
            Detector Head CT-4501
                                                    The HCT-99 is ready made for custom design and labeling.
                                                    Customization may include the meter front panel, function/
                                                    mode set-up, detector heads, manuals and calibration cer-
                                                    tificates. Contact the factory for details and application as-
                                                    sistance.




              Steradian front tube




                                                                     Luminous Color Measurement / Page 2 of 5
                                                  Applications of Optometers and Light Analyzers
                                                                                              Version 04.2009-03

                                    Luminous Color Measurement




                                                    1.2 P-9801

                                                    The P-9801 is a multichannel measurement device for light
                                                    and color measurement. It offers to connect 8 detectors or
                                                    2 CT-3701 color detectors. This device has additional
                                                    measurement functions like CW, Dose, Data-Logger, Color,
                                                    ext. Trigger. The instrument measurement methods in-
                                                    cludes also:
                                                    • simultaneous measurement of all detector channels
                                                    • wide detector signal dynamic range
                                                    • short and variable measurement time
                                                    • fast, multi-channel data-logging
Measurement device P-9801 for color measurement

                                                    1.2.1 CT-3701 Detector Head

                                                    The CT-3701 luminous color detector is designed with pre-
                                                    cise x,y,z tristimulus matching functions to measure the
                                                    illuminance, x,y chromaticity values and color temperature
                                                    of broad band emitting light sources. Four detectors
                                                    mounted in one compact housing are used to form the xshort,
                                                    xlong, y and z spectral tristimulus values for the 2 degree
                                                    viewer.
                                                    The probe feature two separate xshort and xlong functions to
                                                    provide more accurate readings in the blue region over
                                                    detectors with only the xlong function and a simulated xshort
                                                    using the z values.
                                                    Sandwich filtering technology allows a very compact hous-
            Detector Head CT-3701                   ing design with a only 10 mm diameter diffuser window.
                                                    This ensures a uniform illumination of the diffuser as re-
                                                    quired for the measurement of illuminance.
                                                    A special feature of the CT-3701 detector is temperature
                                                    control of it’s photodiodes and filters for ambient tempera-
                                                    ture independent operation. This allows the CT-3701 to be
                                                    integrated into industrial qualification process control appli-
                                                    cations where long term stability is essential.


                                                    1.1.2 Optional Components

                                                    To extend the unit’s light measurement application range
                                                    beyond luminous color, add:
                                                    • Integrating Spheres: luminous flux (calibration in lm)
                                                    • Steradian front tube: luminous intensity (calibration in cd)
                                                    • PC Software for remote operation, OS-P9801


              OS-P9801 Software




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                                                                                          Applications of Optometers and Light Analyzers
                                                                                                                                      Version 04.2009-03

                                                                          Luminous Color Measurement




                                                                                            2. Luminous Color

                                                                                            Color is defined as the attribute of visual perception consist-
                                                                                            ing of any combination of chromatic and achromatic con-
                                                                                            tent. This attribute can be described by chromatic color
                                                                                            names such as yellow, orange, brown, red, pink, green,
                                                                                            blue, purple, etc., or by achromatic color names such as
                                                                                            white, gray, black, etc., and qualified by bright, dim, light,
                                                                                            dark or by combinations of such names.
                                                                                            Perceived color depends on the spectral distribution of the
                                                                                            color stimulus, on the size, shape, structure and surround-
                                                                                            ings of the stimulus area, on the state of adaptation of the
                                                                                            observer’s visual system, and on the person’s experience
                                                                                            of prevailing and similar situations of observation.
                                                                                            There are different ways to measure and define the color.
                                                                                            In the following chapters the single quantities and their pur-
                                                                                            pose are described.
                                CIE 1931 chromaticity diagram

                                                                                            2.1 Illuminance and Color
                                                                         x sh ort
                    1,5
                                                                         x long             It has been known for many years and prescribed that high
                                                                                            illumination levels will have positive effects on spiritual and
 rel. sensitivity




                                                                         y
                     1                                                   z
                                                                                            physical performance. In comparison, low illumination levels
                    0,5
                                                                                            can cause depression and even physical illness.
                                                                                            The classical photometric evaluation for illumination levels
                     0                                                                      is illuminance measured in lux. But sufficient illumination is
                          380   430   480   530     580     630    680   730        780
                                                                                            not the only factor for a healthy physical and biological
                                            w a velen gth ( nm )
                                                                                            home or work environment. Well balanced illumination and
          CIE Standard Observer color-matching function                                     light-colors are necessary and conducive to a long term
                                                                                            healthy life. A life surrounded by optical radiation.
                                                                                            So new generation light meters should also measure color
                                                                                            since it is a significant part of the total visual sensation.


                                                                                            2.2 Luminous Flux and Color

                                                                                            Light source manufacturers and other users need to know
                                                                                            the luminous flux and color temperature they are working
                                                                                            with. Typically integrating spheres are used to measure
                                                                                            these quantities.


                                                                                            2.3 Luminance and Color

                                                                                            Besides illuminance, luminance is one of the most impor-
                          Luminous Flux and Color Measurement                               tant light measurement quantities used to specify the con-
                                 with integrating sphere                                    trast situation on work stations and monitors.


                                                                                            2.4 Luminous Intensity and Color

                                                                                            Spot lamps, like LED’s for example, are very often qualified
                                                                                            by their directional light intensity.
Luminous Intensity and Color Measurement of a LED


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            Applications of Optometers and Light Analyzers
                                                       Version 04.2009-03

Luminous Color Measurement




              3. Traceable Calibration

              Calibration is traceable to the ISO EN 17025 accredited
              part of Gigahertz-Optik‘s Calibration Laboratory for Optical
              Radiation Quantities and NIST standards.
              Calibration of detector sensitivity as well as an individually
              measured plot of spectral sensitivity is included as part of
              the calibration certificate.




                               Luminous Color Measurement / Page 5 of 5

				
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