CN217953676U

CN217953676U - Lighting device for spectrocolorimeter

Info

Publication number: CN217953676U
Application number: CN202222387631.6U
Authority: CN
Inventors: 周建康; 赵知诚; 朱嘉诚; 沈佳玉; 沈为民
Original assignee: Suzhou Pulisi Technology Co ltd; Suzhou University
Current assignee: Suzhou Pulisi Technology Co ltd; Suzhou University
Priority date: 2022-09-06
Filing date: 2022-09-06
Publication date: 2022-12-02
Anticipated expiration: 2032-09-06

Abstract

The utility model discloses a lighting device for a spectral colorimeter, include: the integrating sphere is provided with a light inlet, a light outlet and a detection port; the full-spectrum LED and the multicolor LED are arranged at the light inlet, light emitted by the full-spectrum LED and the multicolor LED enters the integrating sphere through the light inlet, the integrating sphere homogenizes the full-spectrum LED and the multicolor LED, and the homogenized light is incident on an object to be measured from the light outlet; the detector is arranged at the detection port; the system comprises a first pulse driving circuit, a second pulse driving circuit and a detector acquisition circuit, wherein the first pulse driving circuit is connected with the full-spectrum LED and controls the full-spectrum LED to be turned on and turned off, the second pulse driving circuit is connected with the multicolor LED and controls the multicolor LED to be turned on and turned off, and the detector acquisition circuit is connected with the detector and controls the detector to acquire optical signals reflected on an object to be detected. The utility model discloses can acquire the illumination source who is suitable for the spectral colorimeter that spectral radiance or luminance flat change in 380 ~ 780nm wave band. Has the advantages of good stability and long service life.

Description

Lighting device for spectrocolorimeter

Technical Field

The utility model relates to a technical field is measured to the colour, in particular to an illumination device for splitting colorimeter.

Background

In the industries of textile, printing, electronic products, automobiles and the like, colors need to be accurately controlled, and chromaticity instruments are more and more widely used. Colorimeters are mainly classified into two types, optical filter type and spectral type. The filter colorimeter measures the color by adopting the optical filter which accords with the human eye spectrum tristimulus response, and the optical filter cannot completely match the transmittance with the human eye spectrum tristimulus response, namely, the spectrum mismatch error exists. The spectrum of the light source can be directly measured by adopting the light splitting colorimeter, the color is obtained by a colorimetric algorithm, the problem of spectral mismatch does not exist, and the method generally has high colorimetric measurement accuracy. According to the measurement standard, the colorimeter is generally provided with an illumination light source, and in order to guarantee the accuracy of the instrument, the colorimeter needs to cover a spectral range of 380 nm-760 nm, so that a light source with a wide spectrum band is needed.

When the spectrocolorimeter is used for measuring, a wide-spectrum light source covering the vision of human eyes is required to illuminate an object, and the spectral radiance or the spectral intensity curve of the light source is required to be uniform. Light sources adopted by the spectrocolorimeter on the market are mainly a xenon lamp, a tungsten lamp and a white light LED at present. The xenon lamp spectral envelope and the solar spectral envelope are similar in the visible near infrared range, and many lighting instruments adopt xenon lamps as light sources and are widely used on many spectrocolorimeters, such as CM700D of Konica company. As shown in fig. 2, the xenon lamp spectrum has many peaks, and the light emission intensity at the peaks is more likely to fluctuate due to the easy fluctuation of the light emission intensity of the arc discharge, which leads to measurement errors. As shown in FIG. 3, tungsten lamps (halogen tungsten lamps) are often used in calibration instruments, and at present, colorimeters Ci60 to Ci64 of X-rite are all tungsten lamps. The spectrum emitted by the tungsten filament lamp has a smooth curve shape, the color temperature of the tungsten filament lamp is about 3800K on one side, the spectrum has certain difference with the solar spectrum, the spectral line radiation brightness is relatively low about 400nm, the error is large when the color of a purple object is measured, and due to the adoption of a thermal radiation mode, the tungsten filament lamp cannot adopt a pulse driving mode to bring large energy consumption. As shown in fig. 4, the white LED has a wide spectrum and a long service life, and is a product of many manufacturers in China, such as NR110 in sanchen. The white light LED is obtained by blue light excitation, and the light intensity between the wavelength range of below 420nm and the range of 450 nm-550 nm is very weak, so that the measurement accuracy is influenced. It is difficult to satisfy the measurement requirements of spectrocolorimeters.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide a be used for light splitting colorimeter's lighting device that stability is good, long-lived, the broadband within range radiance or intensity is even.

In order to solve the above problem, the utility model provides a lighting device for spectrocolorimeter, it includes:

the integrating sphere is provided with a light inlet, a light outlet and a detection port;

the full-spectrum LED and the multicolor LED are arranged at the light inlet, light emitted by the full-spectrum LED and the multicolor LED enters the integrating sphere through the light inlet, the multicolor LED comprises an ultraviolet LED and a near-infrared LED, the integrating sphere homogenizes the full-spectrum LED and the multicolor LED, and the homogenized light is incident on an object to be measured from the light outlet;

the detector is arranged at the detection port;

the system comprises a first pulse driving circuit, a second pulse driving circuit and a detector acquisition circuit, wherein the first pulse driving circuit is connected with the full-spectrum LED and controls the full-spectrum LED to be turned on and turned off, the second pulse driving circuit is connected with the multicolor LED and controls the multicolor LED to be turned on and turned off, and the detector acquisition circuit is connected with the detector and controls the detector to acquire optical signals reflected on an object to be detected.

As a further improvement, the integrating sphere is provided with a baffle, and the baffle is arranged between the light inlet and the light outlet.

As a further improvement of the utility model, the light inlet is multiple, the light that full spectrum LED and polychrome LED sent gets into through the different light inlets in the integrating sphere.

As a further improvement of the utility model, the device further comprises an imaging mirror, and light reflected on the object to be detected enters the detector through the imaging mirror.

As a further improvement of the utility model, the detection port deviate the detection port normal direction 8.

As a further improvement of the present invention, the multi-color LED is integrated on a PCB.

As a further improvement of the utility model, the ultraviolet LED and the near-infrared LED are driven by the second pulse drive circuit simultaneously or independently.

As a further improvement of the utility model, still include synchronous control circuit, first pulse drive circuit, second pulse drive circuit all with synchronous control circuit connects.

As a further improvement of the utility model, the ultraviolet LED comprises an ultraviolet LED with a central wavelength of 385nm, an ultraviolet LED with a central wavelength of 395nm and an ultraviolet LED with a central wavelength of 405 nm.

As a further improvement of the present invention, the relative intensity ratio of ultraviolet LED with central wavelength of 385nm, ultraviolet LED with central wavelength of 395nm, ultraviolet LED with central wavelength of 405nm, full spectrum LED and near infrared LED is 0.3:0.2:0.2:1:0.4.

the utility model has the advantages that:

the utility model discloses a lighting device for spectrocolorimeter utilizes the integrating sphere with full spectrum LED and the even light of polychrome LED, and polychrome LED includes ultraviolet LED and near-infrared LED, and the accessible adjusts the luminous proportionality coefficient of full spectrum LED, ultraviolet LED, near-infrared DED, acquires the illuminating light source who is suitable for spectrocolorimeter at 380 ~ 780nm wave band internal spectrum radiation intensity or the flat change of luminance. Has the advantages of good stability and long service life.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented according to the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more obvious and understandable, the following preferred embodiments are described in detail with reference to the accompanying drawings.

Drawings

Fig. 1 is a schematic diagram of an illumination device for a spectrocolorimeter in an embodiment of the present invention;

FIG. 2 is a xenon lamp spectral plot;

FIG. 3 is a graph of a tungsten lamp spectrum;

FIG. 4 is a graph of a white light LED spectrum;

fig. 5 is a full spectrum LED spectrum graph in an embodiment of the present invention;

fig. 6 is a graph of the ultraviolet LED spectrum in the embodiment of the present invention;

fig. 7 is a graph of a near-infrared LED spectrum in an embodiment of the present invention;

fig. 8 is a spectrum graph of a combination of a full-spectrum LED and a multi-color LED in an illumination device for a spectrocolorimeter according to an embodiment of the present invention.

Description of the marks

1. An integrating sphere; 2. a full-spectrum LED; 3. a multi-color LED; 4. a detector; 5. and a baffle plate.

Detailed Description

The present invention is further described with reference to the following drawings and specific embodiments so that those skilled in the art can better understand the present invention and can implement the present invention, but the embodiments are not to be construed as limiting the present invention.

As shown in fig. 1, be the utility model provides an in embodiment a lighting device for spectral colorimeter, including integrating sphere 1, full spectrum LED2, polychrome LED3, detector 4, first pulse drive circuit, second pulse drive circuit and detector acquisition circuit, set up into light mouth, light-emitting window and detection mouth on the integrating sphere 1.

The full-spectrum LED2 and the multicolor LED3 are arranged at the light inlet, light emitted by the full-spectrum LED2 and the multicolor LED3 enters the integrating sphere 1 through the light inlet, the multicolor LED3 comprises an ultraviolet LED and a near infrared LED, the integrating sphere 1 homogenizes the full-spectrum LED2 and the multicolor LED3, and the homogenized light is incident on an object to be measured from the light outlet; the detector 4 is arranged at the detection port. Optionally, the multicolored LED3 is integrated on one PCB board. Both the full spectrum LED2 and the multicolor LED3 have fast response capability with fast transition times for drive up and down.

The first pulse driving circuit is connected with the full-spectrum LED2 and controls the full-spectrum LED2 to be turned on and off, the second pulse driving circuit is connected with the multicolor LED3 and controls the multicolor LED3 to be turned on and off, and the detector acquisition circuit is connected with the detector 4 and controls the detector 4 to acquire an optical signal reflected on an object to be detected. Optionally, the ultraviolet LED and the near-infrared LED are driven simultaneously or individually by the second pulse driving circuit.

Further, the device also comprises an imaging mirror, and light reflected on the object to be detected enters the detector 4 through the imaging mirror.

The utility model discloses a lighting device for spectrocolorimeter utilizes integrating sphere 1 with full spectrum LED2 and 3 even light of polychrome LED, and polychrome LED3 includes ultraviolet LED and near-infrared LED, and the accessible adjusts the luminous proportionality coefficient of full spectrum LED2, ultraviolet LED, near-infrared DED, acquires the illuminating light source who is suitable for spectrocolorimeter at 380 ~ 780nm wave band internal spectral radiance or the flat change of luminance. Has the advantages of good stability and long service life.

In some embodiments, a baffle 5 is disposed within integrating sphere 1, and baffle 5 is disposed between the light inlet and the light outlet. The baffle 5 can prevent the light from the light inlet from directly irradiating the object to be measured.

Optionally, there are multiple light inlets, and light emitted from the full-spectrum LED2 and the multi-color LED3 enters the integrating sphere 1 through different light inlets. The light can be mixed more uniformly within integrating sphere 1.

Optionally, the detecting port is 8 ° away from the normal direction of the detecting port. The measurement geometry of CIE D/8 widely used in color measurement is adopted, namely, the measurement window is arranged in a direction which is 8 degrees away from the sampling window to receive the reflected light from the surface of the object to be measured.

In some embodiments, the pulse-width modulation circuit further comprises a synchronous control circuit, and the first pulse driving circuit and the second pulse driving circuit are connected with the synchronous control circuit. The synchronous control circuit controls the first pulse driving circuit and the second pulse driving circuit to be driven synchronously and drives the detector to be exposed.

In one embodiment, the full-spectrum LED2 employs a macro optoelectronic JH1414, the spectral curve of which is shown in fig. 5; the ultraviolet LEDs adopt LuxiGen 385-410 nm Violet LEDs of the Oselan company, the ultraviolet LEDs comprise ultraviolet LEDs with the central wavelength of 385nm, ultraviolet LEDs with the central wavelength of 395nm and ultraviolet LEDs with the central wavelength of 405nm, and the spectral curves of the ultraviolet LEDs refer to FIG. 6; the near infrared light source was a CREE Farred LED, the spectral curve of which is shown in fig. 7.

Taking the relative intensity of a full-spectrum LED as a unit 1, and the relative intensity ratio of an ultraviolet LED with the central wavelength of 385nm, an ultraviolet LED with the central wavelength of 395nm, an ultraviolet LED with the central wavelength of 405nm, a full-spectrum LED2 and a near-infrared LED is 0.3:0.2:0.2:1:0.4, a spectral graph of the full-spectrum LED and the multicolor LED combined is obtained, referring to fig. 8. Furthermore, the combination proportionality coefficient can be readjusted according to the quantum response curve of the detector and the spectral transmittance curve of the optical system to obtain a relatively flat radiation response curve in the spectral range of 380nm to 780 nm.

The above embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. Equivalent substitutes or changes made by the technical personnel in the technical field on the basis of the utility model are all within the protection scope of the utility model. The protection scope of the present invention is subject to the claims.

Claims

1. An illumination device for a spectrocolorimeter comprising:

the detector is arranged at the detection port;

2. The illumination device for a spectrocolorimeter of claim 1 wherein a baffle is provided in the integrating sphere, the baffle being disposed between the light inlet and the light outlet.

3. The illumination device for a spectrocolorimeter of claim 1 wherein the light inlets are plural, and light from the full spectrum LED and the multicolor LED enters the integrating sphere through different light inlets.

4. The illumination device for a spectrocolorimeter of claim 1 further comprising an imaging mirror from which light reflected on an object to be measured enters the detector.

5. The illumination device for a spectrocolorimeter of claim 1 wherein the detection port is offset from a normal direction of the detection port by 8 °.

6. The illumination device for a spectrocolorimeter of claim 1 wherein the multicolor LEDs are integrated on one PCB board.

7. The illumination device for a spectrocolorimeter of claim 1 wherein the ultraviolet LED and the near infrared LED are driven simultaneously or separately by the second pulse driving circuit.

8. The illumination device for a spectrocolorimeter of claim 1 further comprising a synchronization control circuit, the first pulse drive circuit and the second pulse drive circuit being connected to the synchronization control circuit.

9. The illumination device for a spectrocolorimeter of claim 1 wherein the ultraviolet LEDs include an ultraviolet LED having a central wavelength of 385nm, an ultraviolet LED having a central wavelength of 395nm, an ultraviolet LED having a central wavelength of 405 nm.

10. The illumination device for a spectrocolorimeter of claim 9 wherein the ultraviolet LED having a center wavelength of 385nm, the ultraviolet LED having a center wavelength of 395nm, the ultraviolet LED having a center wavelength of 405nm, the full spectrum LED, the near infrared LED have a relative intensity ratio of 0.3:0.2:0.2:1:0.4.