Optical system of light-splitting and color-measuring haze meter based on LED (light-emitting diode) lamp

Abstract

The utility model relates to an optical system of a spectrophotometry haze meter based on an LED lamp, which adopts a special micro spectrometer to divide white light into a sum of 400-700nm spectral signal intensity, accurately simulate a C (or A) light source specified by a standard, and accurately measure the light transmittance / haze of various color samples. Meanwhile, color information of the sample can be obtained, and the color measuring function is achieved. Meanwhile, the instrument adopts a double-optical-path structure, is not afraid of environmental influence, does not need to be preheated, and is high in measurement speed and high in stability and repeatability.

Description

Technical Field

[0001] The utility model belongs to the technical field of material analysis instruments, and specifically relates to an optical system of a spectrocolorimetric haze meter based on an LED lamp. Background Technique

[0002] The transmittance / haze meter is applicable to the transmittance and transmittance haze of all transparent and semi-transparent parallel plane samples (plastic plates, sheets, plastic films, flat glass), and is also applicable to the turbidity measurement of liquid samples (water, beverages, pharmaceuticals, coloring liquids, oils and fats). It has a wide range of application fields in national defense scientific research and industrial and agricultural production.

[0003] At present, the common transmittance / haze meters on the market can be classified into two categories according to the light source: (1) the transmittance / haze meter based on a tungsten halogen lamp; (2) the transmittance / haze meter based on an LED lamp. Among them, the transmittance / haze meter based on a tungsten halogen lamp uses a tungsten halogen lamp as the light source, and its spectral characteristics more meet the standard requirements. It is especially suitable for measuring colored samples and has high accuracy. However, it has high power consumption, large heat generation, short lamp service life, large volume, mechanical modulation, relatively large noise, long preheating time, and poor repeatability. The transmittance / haze meter based on an LED lamp has low power consumption, long lamp service life, light volume, circuit modulation, low noise, short preheating time, and good repeatability. However, using a white LED as the light source, its spectral characteristics do not meet the standard requirements, it is not suitable for measuring colored samples, and the accuracy is low.

[0004] In short, when measuring colorless and transparent objects, the measurement results of the above two types of instruments are relatively consistent; when measuring colored light-transmitting objects, the measurement results of the two differ greatly. Content of the Utility Model

[0005] The purpose of the utility model is to address the defects of the existing transmittance / haze meters, and provide an optical system of a spectrocolorimetric haze meter based on an LED lamp, which integrates the advantages of the two common types of instruments on the market to achieve high-accuracy and high-repeatability measurement.

[0006] Technical Solution

[0007] To achieve the above technical purpose, the utility model provides an optical system of a spectrocolorimetric haze meter based on an LED lamp, which is characterized in that: it includes a light source, a first condenser is arranged on the outgoing light path of the light source, the light emitted by the light source is converged by the first condenser and then divided into a main light path and a reference light path by a semi-transparent and semi-reflective spectroscope on the outgoing light path of the first condenser, and the light of the reference light path directly enters the first micro spectrometer module;

[0008] The light of the main optical path passes through the aperture and then shines on the objective lens. The parallel light beam emitted by the objective lens passes through the sample to be measured on the integrating sphere and enters the integrating sphere from the incident window of the integrating sphere. A swingable standard reflector is installed in the integrating sphere. The standard reflector can block or open the exit window of the integrating sphere according to different measurement items, so that the optical signal is received by the micro spectrometer module two installed on the integrating sphere, or while the optical signal is received by the micro spectrometer module two installed on the integrating sphere, another part of the optical signal is correspondingly emitted from the exit window and then converged onto the micro spectrometer module three through the second condenser lens.

[0009] Further, the light source is a white LED lamp.

[0010] Further, when measuring the transmittance, the standard reflector blocks the exit window, and the light signal diffusely reflected in the integrating sphere is received by the micro spectrometer module two;

[0011] When measuring the haze and color, the standard reflector moves away from the exit window. While the light signal diffusely reflected in the integrating sphere is received by the micro spectrometer module two, another part of the light signal is emitted from the exit window and then converged onto the micro spectrometer module three through the second condenser lens.

[0012] Further, for the parallel light beam emitted by the objective lens, the deviation angle of its light rays is not greater than 3°.

[0013] Further, the opening angle of the exit window with respect to the center of the incident window is 8°, and the edge of the light spot forms an annular band of 1.3° with the exit window.

[0014] Beneficial effects

[0015] The optical system of a spectral colorimetric haze meter based on an LED lamp provided by the present utility model has the following advantages compared with the spectral colorimetric haze meter in the prior art:

[0016] (1) By using a dedicated micro spectrometer, the sum of the spectral signal intensities of white light divided into 400 - 700 nm accurately simulates the C (or A) light source specified by the standard, and accurately measures the transmittance / haze of various color samples; at the same time, the color information of the sample can also be obtained, and it has the function of color measurement.

[0017] (2) By adopting a dual - optical - path structure, the instrument is not afraid of environmental influence, does not need preheating, has a fast measurement speed, and has high stability and repeatability. Description of the drawings

[0018] Attached Figure 1 is the optical path diagram of the embodiment of the present utility model; Detailed implementation manners

[0019] The following describes the implementation modes of the present utility model through specific examples. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. The present utility model can also be implemented or applied through other different specific implementation modes. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present utility model.

[0020] It should be noted that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in this technology to understand and read, and are not used to limit the limited conditions under which the present utility model can be implemented. Therefore, they do not have technical essential significance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the present utility model can produce and the purposes that can be achieved, should still fall within the scope that can be covered by the technical content disclosed in the present utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle", and "one" cited in this specification are only for the convenience of clear narration and are not used to limit the scope under which the present utility model can be implemented. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope under which the present utility model can be implemented.

[0021] Embodiment

[0022] As shown in the Figure 1 accompanying drawings, an optical system of a spectral colorimetric haze meter based on an LED lamp includes a light source 1. A first condenser lens 2 is arranged on the light output path of the light source 1. The light emitted by the light source 1 is converged by the first condenser lens 2 and then is split into a main optical path and a reference optical path by a semi-transparent and semi-reflective beam splitter 4 on the light output path of the first condenser lens 2. The light in the reference optical path directly enters a micro spectrometer module 1 3; the light in the main optical path passes through a diaphragm 5 and then shines on an objective lens 6. The parallel light beam emitted by the objective lens 6 passes through a measured sample 7 on an integrating sphere 8 and then enters the integrating sphere 8 from an incident window 11 of the integrating sphere 8. A swingable standard reflector 10 is installed in the integrating sphere 8. The standard reflector 10 can block or open an output window 12 of the integrating sphere 8 according to different measurement items, so that the optical signal is received by a micro spectrometer module 2 9 installed on the integrating sphere 8, or while the optical signal is received by the micro spectrometer module 2 9 installed on the integrating sphere 8, another part of the optical signal correspondingly exits through the output window 12 and is converged onto a micro spectrometer module 3 14 through a second condenser lens 13. More specifically, the light source 1 is a white LED lamp.

[0023] When measuring the light transmittance, the standard reflector 10 blocks the exit window 12, and the light signal diffusely reflected in the integrating sphere 8 is received by the micro spectrometer module II 9; when measuring the haze, the standard reflector 10 moves away from the exit window 12. While the light signal diffusely reflected in the integrating sphere 8 is received by the micro spectrometer module II 9, another part of the light signal exits through the exit window 12 and is focused onto the micro spectrometer module III 14 by the second condenser lens 13. The parallel light beam emitted by the objective lens 6 has a ray deviation angle of no more than 3°. The exit window 12 subtends an angle of 8° at the center of the entrance window 11, and the edge of the light spot forms an annular zone of 1.3° with the exit window 12.

[0024] The working principle of this embodiment: The light emitted by the light source 1 (white LED lamp) is converged by the first condenser lens 2 and is split into a main optical path and a reference optical path by the semi-transparent and semi-reflective beam splitter 4. The light in the reference optical path directly enters the micro spectrometer module I 3, and the light in the main optical path passes through the aperture 5 and hits the objective lens 6. The objective lens 6 emits a parallel light beam with a ray deviation angle of no more than 3°, and images the aperture 5 on the exit window 12. The exit window 12 subtends an angle of 8° at the center of the entrance window 11, and the edge of the light spot forms an annular zone of 1.3° with the exit window 12. An adjustable standard reflector 10 is installed in the integrating sphere 8. When measuring the light transmittance, the standard reflector 10 is controlled in position to block the exit window 12, and the light signal diffusely reflected in the integrating sphere 8 is finally received by the micro spectrometer module II 9. When measuring the haze and color, the standard reflector 10 moves away from the exit window 12. The light signal diffusely reflected in the integrating sphere 8 is finally received by the micro spectrometer module II 9, and at the same time, the light exiting through the exit window 12 is focused onto the micro spectrometer module III 14 by the second condenser lens 13.

[0025] Among them, the micro spectrometer module I 3, the micro spectrometer module II 9, and the micro spectrometer module III 14 are dedicated micro spectrometers, and their sensors are photodiode arrays, which can receive analog light signals.

[0026] Reference light T r Measured by the micro spectrometer module I 3;

[0027] When measuring the light transmittance, the standard reflector 10 is controlled in position to always block the exit window 12. When there is no sample, the light energy measured by the integrating sphere 8 through the micro spectrometer module II 9 is the total light of the instrument T; after placing the sample, the light energy measured by the integrating sphere 8 through the micro spectrometer module II 9 is the total light of the sample T1.

[0028] Light transmittance

[0029] In the formula:

[0030] λ ---- Wavelength;

[0031] Δλ ---- Wavelength interval;

[0032] S(λ) ---- Relative spectral energy distribution of the standard illuminant;

[0033] ρ r (λ) ---- Spectral distribution rate of the reference light by the micro spectrometer;

[0034] ρ1(λ) ---- Spectral distribution rate of the total light of the sample by the micro spectrometer;

[0035] ρ(λ) ---- Spectral distribution rate of the total light of the instrument by the micro spectrometer;

[0036] When measuring haze, the standard reflector is controlled to be out of position and does not block the exit window. When there is no sample, the scattered light energy T2 of the instrument measured by the integrating sphere through the micro spectrometer module II 9; after placing the sample, the scattered light energy T3 of only the sample measured by the integrating sphere through the micro spectrometer module II 9.

[0037] Haze

[0038] Where:

[0039] ρ3(λ) ---- Spectral distribution rate of the scattered light of the sample by the micro spectrometer;

[0040] ρ2(λ) ---- Spectral distribution rate of the scattered light of the instrument by the micro spectrometer;

[0041] When measuring color, the standard reflector is controlled to be out of position and does not block the exit window. When there is no sample, the transmitted light energy T4 of the instrument measured by the micro spectrometer module III 14; after placing the sample, the transmitted light energy T5 of only the sample measured by the micro spectrometer module III 14.

[0042] Transmittance of the object

[0043] Formula for calculating the tristimulus values

[0044]

[0045] Wherein:

[0046] ---- Spectral tristimulus values of the standard colorimetric observer in the CIE1964-XYX supplementary colorimetry system;

[0047] The present utility model has been described in detail in conjunction with the embodiments with reference to the drawings. Those of ordinary skill in the art can make various variations to the present utility model based on the above description. Therefore, certain details in the embodiments should not constitute a limitation to the present utility model, and the scope of protection of the present utility model will be defined by the scope of the appended claims.

Claims

1. An optical system of a spectral colorimetric haze meter based on an LED lamp, characterized in that: It includes a light source (1). A first condenser lens (2) is arranged on the outgoing light path of the light source (1). The light emitted by the light source (1) is converged by the first condenser lens (2) and then is split into a main light path and a reference light path by a semi-transmissive and semi-reflective beam splitter (4) on the outgoing light path of the first condenser lens (2). The light of the reference light path directly enters a first micro spectrometer module (3). The light of the main light path passes through a light aperture (5) and then irradiates onto an objective lens (6). The parallel light beam emitted by the objective lens (6) passes through a measured sample (7) on an integrating sphere (8) and then enters the integrating sphere (8) from an incident window (11) of the integrating sphere (8). A swingable standard reflector (10) is installed inside the integrating sphere (8). The standard reflector (10) can block or open an outgoing window (12) of the integrating sphere (8) according to different measurement items, so that the optical signal is received by a second micro spectrometer module (9) installed on the integrating sphere (8), or while the optical signal is received by the second micro spectrometer module (9) installed on the integrating sphere (8), another part of the optical signal is emitted from the outgoing window (12) and then is converged onto a third micro spectrometer module (14) through a second condenser lens (13).

2. The optical system of a spectral colorimetric haze meter based on an LED lamp according to claim 1, characterized in that: The light source (1) is a white LED lamp.

3. The optical system of a spectral colorimetric haze meter based on an LED lamp according to claim 1, characterized in that: When measuring the transmittance, the standard reflector (10) blocks the outgoing window (12), and the light signal diffusely reflected inside the integrating sphere (8) is received by the second micro spectrometer module (9). When measuring the haze and color, the standard reflector (10) moves away from the outgoing window (12). While the light signal diffusely reflected inside the integrating sphere (8) is received by the second micro spectrometer module (9), another part of the optical signal is emitted from the outgoing window (12) accordingly and then is converged onto the third micro spectrometer module (14) through the second condenser lens (13).

4. The optical system of a spectral colorimetric haze meter based on an LED lamp as described in claim 1, characterized in that: For the parallel light beam emitted by the objective lens (6), the deviation angle of its light rays is not greater than 3°.

5. The optical system of a spectral colorimetric haze meter based on an LED lamp according to claim 1, wherein: The included angle of the outgoing window (12) with respect to the center of the incident window (11) is 8°, and an annular zone with an angle of 1.3° is formed between the edge of the light spot and the outgoing window (12).

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