RU2817515C1 - Method of determining spatial distribution of erythema radiation force when designing irradiators - Google Patents

Abstract

FIELD: lighting engineering.

SUBSTANCE: invention relates to lighting engineering and relates to a method for determining spatial distribution of erythema radiation force. Method involves determining distribution of irradiance over a sphere surrounding the irradiator in the UV-A and UV-B ranges. Relative spectral distribution of radiation in the wavelength range of 280–400 nm is also obtained. Further, determining the conversion factor of energy values into erythemal values by dividing the relative spectral distribution of radiation into the UV-A and UV-B ranges, determining integral of relative spectral distribution of radiation in UV-A and UV-B regions, determining integrals of the radiation overlapping spectrum of the irradiator and the erythema action spectrum in the UV-A and UV-B regions and calculating the erythematous irradiation in the UV-A and UV-B ranges by multiplying the irradiance by the conversion coefficients. Final erythema exposure is determined by summing the obtained values in the UV-A and UV-B regions and increasing the photometry distance by the square.

EFFECT: enabling measurement of erythemal radiation force in the absence of radiation receivers corrected to the erythemal efficiency curve.

1 cl, 2 dwg

Description

The invention relates to lighting engineering, photobiology, medicine and can be used in the design of irradiation installations for photariums, solariums, beauty salons, as well as in the activities of lighting engineering research laboratories.

The closest to the claimed technical solution are methods for determining the spatial distribution of radiation intensity and luminous intensity. If we consider the known method for determining the distribution of light intensity, it is based on step-by-step recording of illumination values when turning the goniometer to a known angle. To carry out the measurement, a goniophotometer and a photodetector are used. A photometric head, adjusted to the relative spectral luminous efficiency curve, is usually used as a photoreceiving device. The luminous intensity is calculated by multiplying the obtained illuminance value by the square of the photometric distance. [GOST R 55702-2020 “Electric light sources. Methods for measuring electrical and light parameters", approved. by order of Rosstandart dated November 11, 2020 No. 1053-st].

When measuring the spatial distribution of luminous intensity of lighting devices, both far-field and near-field goniophotometers can be used, which must provide measurement of the luminous intensity of lighting devices in one of the photometric systems. When measuring, the light device is installed in a position in which the photometric center coincides with the center of rotation of the rotating device of the goniophotometer, and the photometric axis of the rotating device coincides with the optical axis; longitudinal axis or transverse axis depending on the photometric system.

In turn, from GOST 34819-2021 “Lighting devices. Lighting requirements and test methods", approved. By order of Rosstandart dated January 20, 2022 No. 28-st, it is known that the photometric distance is determined by the distance from the center of rotation of the goniometer rotary device to the center of the photometric head. Its minimum ratio to the maximum size of the emitting surface of the lighting device should be, depending on the luminous intensity curve of the lamp, no less than:

- 10 - for lamps with a concentrated luminous intensity curve;

- 7 - for luminaires with a deep and wide luminous intensity curve;

- 5 - for luminaires with a luminous intensity curve of all other types.

In this case, in the photometric system C, γ, the measured range of meridional angles γ is set:

- from 0° to 90° - for the lower hemisphere;

- from 90° to 180° - for the upper hemisphere;

- from 0° to 180° - for a full sphere.

In systems B, β and A, α, the measured range of meridional angles β and α is from -90° to 90° for any hemisphere.

The range of equatorial angles that defines the meridional planes is in the range:

- from 0° to 360° - for the photometric system C, y;

In photometric systems B, β and A, α:

- from minus 90° to 90° - for the lower hemisphere;

- from minus 180° to minus 90° and from 90° to 180° to - for the upper hemisphere;

- from minus 180° to 180° - for a full sphere.

If we consider the known methods for determining the spatial distribution of radiation intensity, then in this case, as part of the gonioradiometric complex for measuring irradiance, a radiometric head is used, which does not have a correction for the relative spectral luminous efficiency function.

The minimum photometric distance depends on the spatial characteristics of the radiometric head. In general, it should be at least five overall dimensions of the lamp.

The goniometric method for determining the spatial distribution of radiation intensity is based on measurements of the distribution of energy illumination in a photometric system C, γ over a spherical surface of radius D.

The measurement range in meridional half-planes is from 0° to 180°. Measuring range in the equatorial plane is from 0° to 360°. [GOST R 70380-2022 “Low pressure ultraviolet bactericidal lamps. Methods for measuring energy ultraviolet radiation electrical parameters", approved. by order of Rosstandart dated October 4, 2022 No. 1047-st].

The disadvantages of the methods described above for determining the spatial distribution of luminous intensity and radiation intensity are:

- The impossibility of their use for the design of irradiators, irradiation installations with erythemal action.

The spatial distribution of luminous intensity takes into account the relative spectral luminous efficiency of the radiation (standard photometric observer), but does not take into account the relative spectral efficiency curve of the erythemal radiation.

- The spatial distribution of radiation intensity does not take into account the relative spectral efficiency curve of erythemal radiation.

- The impossibility of using known methods for measuring erythema values, due to the lack of radiation receivers on the Russian market designed for measuring erythema values and units.

The technical result achieved by the claimed invention is that the developed method makes it possible to obtain the spatial distribution of erythemal radiation power by taking into account the relative spectral erythemal efficiency curve and preliminary measurement of the spectral distribution of radiation from the irradiator or radiation source. This method provides the ability to measure erythemal radiation power in the absence of radiation receivers adjusted to the erythemal efficiency curve, and also provides the possibility of its use for designing irradiators and irradiation installations with predetermined parameters of erythemal radiation.

The inventive method for determining the spatial distribution of the strength of erythemal radiation when designing irradiation installations involves the following steps: using a gonioradiometric installation, the distribution of energy illumination is determined over the sphere surrounding the source (irradiator) in the UV-A: E _A (θ,ϕ) and UV-B ranges: E _B (θ,ϕ); using a spectroradiometer, the relative spectral distribution of radiation is obtained: E _otp (λ) for one arbitrarily chosen direction in the wavelength range 280-400 nm; determine the conversion coefficient of energy values into erythemal values by dividing the resulting relative spectral distribution of radiation into two ranges of UV-A and UV-B, then determining the integrals of the relative spectral distribution of radiation in the UVA and UV-B regions, determining the integrals of the spectrum of overlap between the radiation of the irradiator and the spectrum the action of erythema in the UV-A and UV-B regions and subsequent calculation of erythemal irradiance in the UV-A and UV-B ranges by multiplying the irradiance by the corresponding conversion factors of energy values into erythemal values; determination of the final erythemal irradiance by summing the two obtained values in the UV-A and UV-B regions and subsequent increase by the square of the photometric distance.

Brief description of the drawings.

In fig. Figure 1 shows the dependence of relative erythemal efficiency on wavelength in the UV-A range.

In fig. Figure 2 shows the dependence of relative erythemal efficiency on wavelength in the UV-B range.

To obtain the spatial distribution of the strength of erythemal radiation, it is necessary to measure on a gonioradiometric installation the distribution of energy illumination over the sphere surrounding the source (irradiator) in the UV-A: E _A (θ, ϕ) regions; UV-B: E _B (θ, ϕ), and also using a spectroradiometer to obtain its relative spectral distribution of radiation E _answer (λ) for one arbitrarily chosen direction in the wavelength range 280-400 nm.

Next, it is necessary to find the conversion coefficient of energy values into erythemal values. To do this, the resulting relative spectral distribution of radiation is divided into two regions, UV-A and UV-B. Next, using formula 1, the integral of the relative spectral distribution of radiation in the UV-A region is found.

where E _ota is the relative spectral distribution of radiation;

λ - wavelength.

After this, formula 2 determines the integral of the spectrum of overlap of the radiation source (irradiator) and the spectrum of action of the erythema in the UV-A region:

where V _epA is the spectrum of action of erythema in area A (see Fig. 1).

The final conversion of irradiance into the component of erythemal irradiance in the UV-A region is carried out according to formula 3.

where E _A (θ, ϕ) is the signal of the radiometric head in a given direction.

A similar sequence is performed for the UV-B radiation range:

- finding the integral of the relative spectral distribution of radiation in the UV-B region;

- determination of the integral of the spectrum of overlap of the radiation source (irradiator) and the spectrum of action of erythema in the UV-B region (formula 4);

where V _epB is the spectrum of action of erythema in area B (see Fig. 2).

- calculation of erythemal irradiance by multiplying the irradiance in the UV-B range by the conversion factor of energy values into erythemal values.

The final erythemal irradiance is determined by summing the two obtained values in the UV-A and UV-B regions (formula 5).

The determination of the erythemal radiation strength is carried out according to formula 6, which is the law of the square of the distance.

where D is the photometric distance.

Thus, the claimed method for determining the spatial distribution of erythemal radiation power when designing irradiation installations makes it possible to obtain the spatial distribution of erythemal radiation power by taking into account the relative spectral erythemal efficiency curve and preliminary measurement of the spectral distribution of radiation from the irradiator or radiation source and provides the ability to measure erythemal radiation power in the absence of receivers radiation corrected to the erythemal efficiency curve, and also provides the possibility of its use for designing irradiators and irradiation installations with predetermined parameters of erythemal radiation, which confirms the achievement of the stated technical result.

The proposed method can be used in the design of irradiation installations for phototariums, solariums, beauty salons, as well as in the activities of lighting engineering research laboratories.

Claims (1)

A method for determining the spatial distribution of erythemal radiation strength when designing irradiation installations, involving the following steps: using a gonioradiometric installation, determine the distribution of energy illumination over the sphere surrounding the irradiator in the UV-A: E _A (θ,ϕ) and UV-B: E _B ranges (θ,ϕ) ; using a spectroradiometer, the relative spectral distribution of radiation is obtained: E _rel (λ) for one arbitrarily chosen direction in the wavelength range 280-400 nm; determine the conversion coefficient of energy values into erythemal values by dividing the resulting relative spectral distribution of radiation into two ranges, UV-A and UV-B, then determining the integral of the relative spectral distribution of radiation in the UV-A and UV-B regions, determining the integrals of the spectrum of overlap between the radiation of the irradiator and the spectrum the action of erythema in the UV-A and UV-B regions and subsequent calculation of erythemal irradiance in the UV-A and UV-B ranges by multiplying the irradiance by the corresponding conversion factors of energy values into erythema values; determination of the final erythemal irradiance by summing the two obtained values in the UV-A and UV-B regions and then increasing the photometric distance by the square.