RU91761U1 - REFERENCE DEVICE FOR TRANSFER OF THE SIZE OF THE UNITS OF COORDINATES OF COLOR OF SELF-LIGHTING OBJECTS - Google Patents

Abstract

A reference device for transmitting the size of the units of color coordinates of self-luminous objects, including a photometric ball, a set of LED radiation sources with radiation close to monochromatic radiation and having red, green, blue and white colors; a power source for LED radiation sources, a spectroradiometer, a system for recording output signals and processing them, characterized in that it contains a set of light-measuring lamps with a continuous emission spectrum, a set of glass color optical filters, a seat for placing LED radiation sources (SII) is made in the photometric ball, or light bulbs, the SRI set contains a yellow LED, and each LED from the SRI set has a housing with air-forced cooling, working whose surface is identical to the inner surface of the photometric ball, a shield is located inside the photometric ball to eliminate directional radiation from radiation sources or light bulbs, a light-scattering screen is placed in the plane of the output hole of the photometric ball to evenly distribute the radiation over the area.

Description

The utility model relates to measuring technique in terms of creating reference devices for transmitting the size of color coordinate units, correlated color temperature and brightness of self-luminous objects.

The reference device can be used as a working standard for transmitting the sizes of units of chromaticity coordinates, correlated color temperature and brightness of self-luminous objects to subordinate standards and working measuring instruments.

Known reference installation (reference spectrophotometer), designed to measure and transmit the size of units of color coordinates and color non-luminous transparent and reflective samples, as well as self-luminous objects [1]. The installation consists of: a photometric ball; a set of emitters based on incandescent lamps; a set of emitters reproducing the spectral composition and color of the main phosphors used in cathode ray tubes (CRTs); filament lamp power systems; CRT emitter power systems; monochromator; radiation receiver; communication devices with the object; personal computer, printing device; plotter.

The disadvantages of this installation are:

- the use of emitters created on the basis of CRT, which lead to the emergence of additional sources of uncertainty in determining the division of the color coordinates of self-luminous objects, the use of a complex system of specialized power sources for emitters, which is due to the peculiarity of providing power to the CRT; the impossibility of measuring the correlated color temperature and brightness of self-luminous objects.

The closest in technical essence to the claimed (prototype) is a reference device for transmitting the size of coordinate units of color, light intensity, illumination and brightness of self-luminous objects [2]. The device includes: photometric ball; a set of emitters located inside the photometric ball and representing 4 blocks that contain 256 LEDs with radiation close to monochromatic and having red, green, blue and white colors; multi-channel power supply with built-in thermal stabilization system of LEDs; radiation receivers based on a spectroradiometer and photometer; system for recording output signals and their processing.

The disadvantages of this device are: the need for preliminary selection of a large number of LEDs according to both photometric and spectral characteristics, the absence of a light source with a continuous spectrum, which affects the accuracy of measuring brightness, and also reduces the list of the nomenclature of the tested products (impossibility of calibrating radiation sources with a continuous spectrum the inability to measure correlated color temperature)

The objective of the utility model is to create a device that provides with sufficient accuracy the transfer of the size of the units of chromaticity coordinates, the correlated color temperature and brightness of self-luminous objects both with a continuous emission spectrum and close to monochromatic.

The problem is solved in that the reference device for transmitting the size of the units of color coordinates of self-luminous objects, including a photometric ball, a set of LED radiation sources with radiation close to monochromatic radiation and having red, green, blue and white colors; a power source for LED radiation sources, a spectroradiometer, a system for recording output signals and processing them, characterized in that it contains a set of light bulbs with a continuous emission spectrum, a set of glass color optical filters, a footprint for placing LED radiation sources (SII) or light measuring in a photometric ball lamps, the SII set contains a yellow LED, and each LED from the SII set has a case with air-forced cooling, working overhnost which is identical to the inner surface of the integrating sphere, it is located inside the integrating sphere to eliminate directional shield radiation from the FIC or photometric lamps in the outlet plane of the integrating sphere light diffusing screen is placed for uniform distribution of the radiation area.

The technical result of the utility model is that the proposed device will expand the range of the studied self-luminous objects with both close to monochromatic and with a continuous spectrum of radiation, expand the functionality in terms of measuring the correlated color temperature and brightness of self-luminous objects with a continuous spectrum of radiation, produce power SRI and light bulbs using commercially available power sources.

The essence of the utility model is illustrated by figure 1, which shows a diagram of the proposed device.

The device comprises: a light-scattering screen 1, a photometric ball 2, a shield 3, a set of LED radiation sources (SII) 4, a set of glass optical filters 5, a set of light-measuring lamps with a continuous emission spectrum 6, a power supply for light-measuring lamps 7, a power supply for LED radiation sources 8 , a system for recording output signals and their processing 9, spectroradiometer 10.

The device operates as follows.

Set one of the LED radiation sources (4) included in the kit into the seat in the photometric ball (2). Using the voltage converter, which is part of the SRI, include forced air cooling of the LED, using the power source (8) set the current specified in the calibration certificate of this LED radiation source (SRI). A spectroradiometer (10) is installed in front of the light-scattering screen (1) located in the photometric ball. The distance from the light-scattering screen to the spectroradiometer depends on the lens used in conjunction with the spectroradiometer and is given in the operational documentation (ED) of the spectroradiometer. According to the ED of the spectroradiometer, color coordinates x ₀ , y ₀ , correlated color temperature T _{CP, 0} (only for SRI of white luminescence) or brightness L _{0 of a} luminous light-scattering screen are measured. The measurement results are displayed on the screen of a personal computer, which is part of the system for recording output signals and processing them (9) (hereinafter referred to as the system). Then, with a constant current of SRI, a test device is installed in front of the luminous diffusing screen, designed to transmit units of color coordinates, correlated color temperature or brightness. The test device is turned on according to its ED and readings of the chromaticity coordinates x _i , y _i , correlated color temperature T _{CP, i} (only SRI of white light) or brightness L _{i are taken} .

The systematic component of the error of the test instrument readings is estimated using the formulas

where N _{xi, yi} are the test instrument readings corresponding to the chromaticity coordinates x and y, in units of chromaticity coordinates.

N _{x0, y0} - - spectroradiometer readings corresponding to the chromaticity coordinates x and y, in units of chromaticity coordinates.

T _{CP, i} - test instrument reading corresponding to the value of the correlated color temperature, K

- spectroradiometer reading corresponding to the value of the correlated color temperature, K

N _{L, i} is the test instrument reading corresponding to the brightness value, cd / m ² .

- the reading of the spectroradiometer corresponding to the brightness value, cd / m ² .

The metrological characteristics of the device under test are calculated using the system according to the formulas given in the verification methods (calibration) of a particular type of device.

The transfer of the size of the units of chromaticity coordinates, correlated color temperature, and brightness of continuous-spectrum radiation sources is as follows.

Install the light-measuring lamp (6) in front of the inlet of the photometric ball (the inlet is at the same time a seat for SRI) so that the lamp body is on the same optical axis as the center of the inlet of the photometric ball). Using a power supply unit (7), a light measuring lamp is turned on and the voltage specified in the verification certificate (calibration) is applied to it, which is recorded using the multimeter included in the system. If necessary, one of the glass color optical filters included in set (5) is installed between the lamp body and the inlet. They make measurements similar to those for FIC.

Information sources

1. Fundamentals of optical radiometry / B.C. Ivanov [et al.]; under the editorship of prof. A.F. Kotyuk. - M .: Fizmatlit, 2003 .-- 368 p.

2. Fryc, I. LED-based spectrally tunable source for radiometric, photometric, and colorimetric applications / I. Fryc [et al] // Optical. Eng. - 2005. - Vol. 44. - N11 - P.111309-1-111309-8.

Claims (1)

A reference device for transmitting the size of the units of color coordinates of self-luminous objects, including a photometric ball, a set of LED radiation sources with radiation close to monochromatic radiation and having red, green, blue and white colors; a power source for LED radiation sources, a spectroradiometer, a system for recording output signals and processing them, characterized in that it contains a set of light-measuring lamps with a continuous emission spectrum, a set of glass color optical filters, a seat for placing LED radiation sources (SII) is made in the photometric ball, or light bulbs, the SII kit contains a yellow LED, and each LED from the SII kit has a housing with air-forced cooling, working the surface of which is identical to the inner surface of the photometric ball, a shield is located inside the photometric ball to eliminate directional radiation from radiation sources or light bulbs, a light-scattering screen is placed in the plane of the outlet of the photometric ball for uniform distribution of radiation over the area.