Synthetic equal-energy white light standard light source using halogen tungsten lamp and multi-primary color LED light source

Abstract

The present invention belongs to the technical field of semiconductor lighting, and specifically relates to a synthetic equal-energy white light standard light source using a tungsten halogen lamp and a multi-primary color LED light source. It includes an integrating sphere, a multi-primary color LED light source, a tungsten halogen lamp, a baffle, and an exit port lens; the multi-primary color LED light source and the tungsten halogen lamp are used as light sources and are respectively installed on the wall of the integrating sphere. The light emitted by the light sources is mixed by the integrating sphere and then emitted through the exit port lens; the baffle is arranged in front of the exit port. The multi-primary color LED light source is composed of LED chips and phosphors with multiple primary color spectra. The relative spectral radiant intensity of the standard light source spectrum of the present invention within the target effective wavelength range is the same, which can avoid the influence caused by the difference in the signal-to-noise ratio of different wavelengths of the light source in metrological tests.

Description

Technical Field

[0001] The present invention belongs to the technical field of semiconductor lighting, and particularly relates to a synthetic equal-energy white light standard light source using a tungsten halogen lamp and a multi-primary color LED light source. Background Art

[0002] The diversity of the LED spectrum enables its wide application in various fields. LEDs in the ultraviolet band are used for disinfection and sterilization, full-spectrum LEDs are used for plant lighting, and LEDs in the near-infrared band are used for hair removal and beauty.

[0003] In order to reasonably use LED light sources, accurately measuring the light output of LEDs is a very important prerequisite. Insufficient ultraviolet irradiance will result in incomplete disinfection, while excessive irradiance is likely to cause harm to people; inappropriate light for plant lighting will affect the growth of plants; insufficient irradiance of the near-infrared light used for hair removal will not be able to remove hair, and excessive irradiance will cause thermal damage to the skin. Therefore, accurate measurement of irradiance or radiant flux is required for LED lamps in each band.

[0004] Currently, the standard lamp in the ultraviolet band is a deuterium lamp, but the light attenuation is very fast and the stability is poor in the 220 - 230 nm band. Tungsten halogen lamps are used in the visible and near-infrared bands, but the signal in the blue-violet band is low and the signal-to-noise ratio is insufficient, affecting the measurement accuracy. Summary of the Invention

[0005] The purpose of the present invention is to provide a standard light source that can be used in the full-band fields of ultraviolet, visible, and near-infrared, and uniformly configure equal-energy light; the standard light source of the present invention can replace the deuterium light source, and can provide a flat spectrum in the blue-violet and ultraviolet bands, and the measurement signal-to-noise ratio is much higher than that of a pure tungsten halogen standard lamp, improving the stability.

[0006] The technical solution of the present invention is specifically introduced as follows.

[0007] A synthetic equal-energy white light standard light source using a tungsten halogen lamp and a multi-primary color LED light source, which includes an integrating sphere, a multi-primary color LED light source, a tungsten halogen lamp, and an exit lens; the multi-primary color LED light source and the tungsten halogen lamp are respectively installed on the wall of the integrating sphere, and the emitted light of the multi-primary color LED light source and the tungsten halogen lamp is fully mixed through the integrating sphere and then exits from the exit lens through the exit port of the integrating sphere; a baffle is arranged in front of the exit port to block the direct light of the tungsten halogen lamp and the multi-primary color LED light source; wherein: the types of primary colors of the multi-primary color LED light source at least include the ultraviolet band, the violet band, the blue band, the cyan band, the green band, the yellow band, the orange band, and the red band.

[0008] In the present invention, the multi-primary color LED light source is composed of LED chips with multiple primary color spectra and phosphors.

[0009] In the present invention, the multi-primary color LED light source is a single LED light source synthesized from multiple single primary colors, or LED light sources with multiple single primary color spectra or different synthesized spectra.

[0010] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0011] The standard light source of the present invention can effectively output equal-energy white light with a wavelength band of 220 - 1000 nm, and the least squares deviation value between its normalized synthesized equal-energy white light standard light source spectrum and the theoretical equal-energy white light spectrum is less than 1.

[0012] The relative spectral radiant intensity of the spectrum of the standard light source of the present invention within the target effective wavelength band range is the same, which can avoid the influence caused by the difference in the signal-to-noise ratio of different wavelengths of the light source in metrological tests.

[0013] The equal-energy white light standard light source of the present invention effectively solves the problems of low signal-to-noise ratio in the blue wavelength band of traditional tungsten halogen standard lamps and poor stability of deuterium lamps, and is applicable to the calibration of irradiance or radiant flux in the entire wavelength band of ultraviolet, visible, and near-infrared, realizing the standardization of standard lamps in each wavelength band. Description of the Drawings

[0014] Figure 1 The equal-energy white light curve obtained in Example 1.

[0015] Figure 2 Structural diagram of the synthesized equal-energy white light standard light source of a tungsten halogen lamp and a multi-primary color LED light source in Example 1.

[0016] Figure 3 Structural diagram of the synthesized equal-energy white light standard light source of a tungsten halogen lamp and 35 primary color LED light sources in Example 2.

[0017] Reference numerals in the figure: 1 - integrating sphere, 2 - multi-primary color LED light source, 3 - tungsten halogen lamp, 4 - baffle, 5 - light outlet lens. Detailed Embodiments

[0018] The following described embodiments are only partial embodiments of the present invention. All other embodiments based on the embodiments of the present invention without creative achievements belong to the protection scope of the present invention.

[0019] Example 1

[0020] A multi-primary color LED light source synthesized from 35 primary colors is mixed with a tungsten halogen lamp 3 to obtain synthesized equal-energy white light with a wavelength range of 220 - 1000 nm, which is applicable to the calibration of irradiance or radiant flux of ultraviolet, visible, and near-infrared LED light sources.

[0021] The central wavelengths of the 35 primary color spectra for synthesizing an equal-energy white light source and the spectrum of the tungsten halogen lamp 3 cover 210 - 850 nm, and their peak wavelengths, half-widths, and synthesis ratios are shown in Table 1. This synthesized spectrum is as Figure 1 shown, and its least squares deviation from the theoretically calculated equal-energy white light spectrum in the range of 220 - 1000 nm is 0.12.

[0022] The structure of this equal-energy white light standard light source is as Figure 2 shown, including an integrating sphere 1, a multi-primary color LED light source 2 and its radiator, a tungsten halogen lamp 3, a baffle 4, and an exit port lens 5.

[0023] The multi-primary color LED light source 2 adopts a COB structure and is composed of 35 monochromatic lights with the peak wavelengths and half-widths described in Table 1 combined according to the synthesis ratios shown in Table 1, forming an equal-energy white light in the range of 220 - 660 nm.

[0024] The tungsten halogen lamp 3 is a directional tungsten halogen lamp, which supplements the light in the wavelength band after 660 nm of the LED light source. The combined light source extends the equal-energy white light from 220 - 660 nm to 220 - 1000 nm.

[0025] The integrating sphere 1 is a small-sized 0.3 m integrating sphere, and the anti-reflection coating can effectively reflect the light radiation in the wavelength band of 220 - 1200 nm. When combined with the multi-primary color LED light source 2 and the tungsten halogen lamp 3, the two lights are fully diffusely reflected in the sphere, and the output effective equal-energy band is equal-energy white light in the range of 220 - 1000 nm.

[0026] The baffle 4 at the exit port is to prevent the light of the multi-primary color LED light source 2 or the light of the tungsten halogen lamp 3 from directly going out from the exit port, ensuring that all the light at the exit is equal-energy white light that has been fully diffusely reflected.

[0027] The exit port lens 5 is used to distribute the light of the output equal-energy white light. Different lenses can be used to calibrate light sources with different light distributions, reducing the test error.

[0028] Table 1 Parameters and synthesis ratios of the 36 primary color spectra for synthesizing an equal-energy white light source

[0029]

[0030] Example 2

[0031] Same as Example 1, using the LED spectrum of 35 primary colors and mixing it with the tungsten halogen lamp 3 to obtain a synthesized equal-energy white light with a wavelength range of 220 - 1000 nm, and its least squares deviation from the theoretically calculated equal-energy white light spectrum in the range of 220 - 1000 nm is 0.12.

[0032] Compared with the structure in Embodiment 1, one kind of LED light source which is a mixture of 35 primary color LED chips and phosphors is changed to 35 single - color light sources, which are respectively installed inside the wall of the integrating sphere. At the same time, a tungsten - halogen lamp is mixed. The structure of the equal - energy white light standard light source is as follows Figure 3 As shown, it includes an integrating sphere 1, 35 multi - primary - color LED light sources 2, a tungsten - halogen lamp 3, a baffle 4, and a light - emitting port lens 5.

[0033] The 35 LED light sources are all directional single - color light sources. The tungsten - halogen lamp 3 is a directional tungsten - halogen lamp. The mixed light is equal - energy white light.

[0034] The integrating sphere 1 is a small - size 0.3m integrating sphere. The anti - reflection coating can effectively reflect light radiation in the 220 - 1200nm band. Combined with 35 single - color LED light sources and a tungsten - halogen lamp, the 36 - primary - color light is fully diffusely reflected inside the sphere, and the output effective equal - energy band is 220 - 1000nm equal - energy white light.

[0035] The baffle 4 at the light - emitting port is to prevent the light of the LED light source or the light of the tungsten - halogen lamp 3 from directly going out of the exit, ensuring that all the light at the exit is equal - energy white light that has been fully diffusely reflected.

[0036] The light - emitting port lens 5 is used to distribute the equal - energy white light emitted. Different lenses can be used to calibrate light sources with different light distributions, reducing test errors.

Claims

1. A synthetic equal-energy white light standard light source using a tungsten halogen lamp and a multi-primary color LED light source, characterized in that, it is used to output equal-energy white light with a wavelength range of 220 - 1000 nm; it includes an integrating sphere, a multi-primary color LED light source, a tungsten halogen lamp, and an exit lens; the multi-primary color LED light source and the tungsten halogen lamp are respectively installed on the inner wall of the integrating sphere, and the types of primary colors of the multi-primary color LED light source include at least the ultraviolet band, the violet band, the blue band, the cyan band, the green band, the yellow band, the orange band, and the red band. The emitted light of the multi-primary color LED light source and the tungsten halogen lamp is fully mixed by the integrating sphere and then exits through the exit lens at the exit of the integrating sphere; a baffle is arranged in front of the exit to block the direct light of the tungsten halogen lamp and the multi-primary color LED light source; where: The multi-primary color LED light source constitutes equal-energy white light in the range of 220 - 660 nm; The tungsten halogen lamp is a directional tungsten halogen lamp, which supplements the light in the wavelength range after 660 nm of the LED light source, and the combined light source extends the equal-energy white light from 220 - 660 nm to 220 - 1000 nm.

2. The synthetic equal-energy white light standard light source using a tungsten halogen lamp and a multi-primary color LED light source according to claim 1, characterized in that, The multi-primary color LED light source is composed of LED chips and phosphors with multiple primary color spectra.

3. The synthetic equal-energy white light standard light source using a tungsten halogen lamp and a multi-primary color LED light source according to claim 1, characterized in that, The multi-primary color LED light source is a single LED light source synthesized by multiple single primary colors, or multiple single primary color spectra or LED light sources with different synthetic spectra.

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