Portable coaxial diffuse reflection light source

Abstract

The invention discloses a portable coaxial diffuse reflection light source which comprises a shell. The optical fiber connector is arranged at one end of the shell, and the optical fiber connector is used for connecting an optical fiber and a light source / spectrograph; the lamp panel is arranged in the shell, a plurality of lamp beads are arranged on the lamp panel, each lamp bead is loaded with different resistors, and each lamp bead is provided with a voltage stabilizing plate and a reflecting film and is arranged in the shell. Compared with a traditional halogen bulb, the cost of the LED light source is lower in cost benefit, and the manufacturing cost of the whole equipment can be reduced. In terms of service life and stability, the service life of the LED light source is far longer than that of a halogen lamp, and the frequency and maintenance cost of replacing the light source can be reduced. In the aspect of wavelength, the LED light source covers a wide wavelength range required by the near infrared spectrum, and especially in the application of near infrared spectrum detection of 900-1700 nm, the intensity of the whole wavelength range is adjustable. And the detection applicability is enhanced.

Description

Technical Field

[0001] The present invention belongs to the technical field of light sources for near-infrared spectrometers, and particularly relates to a portable coaxial diffuse reflection light source. Background Art

[0002] A near-infrared spectrometer is an instrument used to measure the absorption and scattering properties of substances in the near-infrared band. By detecting the absorption of near-infrared light by a sample, chemical composition and structural information of the sample can be obtained. During the detection process of near-infrared spectroscopy, especially in miniaturized and batch near-infrared spectroscopy detections, the commonly used light source is a halogen lamp. However, due to the size and price of the halogen lamp, to a certain extent, it has hindered the wide application of near-infrared spectroscopy.

[0003] In related technologies, the light source of a certain near-infrared spectrometer uses a high-quality imported special-purpose bulb with a service life of up to 10,000 hours, or a module with an in-built lamp and optical fiber, which is used for diffuse reflection measurement in near-infrared spectrophotometry and also uses a halogen lamp. Due to limiting factors such as the size and price of the halogen lamp, it is a major problem for the wide application of near-infrared spectroscopy. Summary of the Invention

[0004] The object of the present invention is to propose a portable coaxial diffuse reflection light source to solve the problems in the prior art.

[0005] To this end, the present invention provides a portable coaxial diffuse reflection light source, including a housing;

[0006] An optical fiber connector is provided at one end of the housing, and the optical fiber connector is used to connect an optical fiber and a light source / spectrometer;

[0007] A lamp board is provided inside the housing. Multiple lamp beads are provided on the lamp board, and each lamp bead is loaded with a corresponding resistor. The lamp beads are equipped with a voltage stabilizing board, so that the current of each lamp bead can be adjusted individually on the voltage stabilizing board. By combining two adjustment methods, the spectral intensity emitted by each lamp bead is kept consistent;

[0008] A reflective film is provided inside the housing for enabling all diffuse reflection of the near-infrared light source.

[0009] As a further description of the above technical solution, it further includes quartz glass, and the quartz glass is used to protect the lamp board and the lamp beads.

[0010] As a further description of the above technical solution, the lamp beads are LED lamp beads.

[0011] As a further description of the above technical solution, the wavelength range of multiple lamp beads is 900 - 1720 nm.

[0012] As a further description of the above technical solution, the number of the lamp beads is set to five, and each lamp bead is connected to a load resistor, so that the supply voltage of the lamp beads is maintained at 1.8V.

[0013] As a further description of the above technical solution, the included angle between each of the lamp beads is 45°.

[0014] As a further description of the above technical solution, a radiator is provided on the back of the lamp board, the radiator is arranged inside the housing, and the radiator is used to dissipate heat from the lamp board and the lamp beads.

[0015] As a further description of the above technical solution, both the housing and the radiator are made of aluminum alloy material, and the radiator is a hollow gear-shaped structure.

[0016] As a further description of the above technical solution, the reflective film is a PC reflective film, and the PC reflective film is subjected to frosting treatment.

[0017] As a further description of the above technical solution, a 5V, 600mA voltage and current stabilizing chip is provided on the lamp board, and the voltage and current stabilizing chip is used to maintain the stability of the voltage and current of the lamp beads.

[0018] Beneficial effects:

[0019] 1. The present invention provides a portable coaxial diffused light source. By replacing the halogen bulb with an LED light source, the size is smaller. In terms of cost-effectiveness, compared with the traditional halogen bulb, the cost of the LED light source is lower, which is beneficial to reducing the manufacturing cost of the overall device. In terms of lifespan and stability, the lifespan of the LED light source far exceeds that of the halogen lamp, which can reduce the frequency of replacing the light source and the maintenance cost. In terms of wavelength, the LED light source covers the wide wavelength range required by the near-infrared spectrum, enhancing the applicability of detection. At the same time, the stability of the light source can be maintained. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0021] Figure 1 It is a schematic structural diagram of a portable coaxial diffused light source provided by the present invention.

[0022] Figure 2 It is an exploded view of a portable coaxial diffused light source provided by the present invention.

[0023] In the figure: 1. Outer shell; 2. Fiber optic connector; 3. Lamp board; 4. Lamp beads; 5. Quartz glass; 6. Radiator; 7. Sealing ring. Specific implementation manners

[0024] The content of the present invention can be more easily understood by referring to the detailed description of the preferred implementation methods of the present invention below and the included embodiments. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. In case of contradiction, the definitions in this specification shall prevail.

[0025] The present invention provides a portable coaxial diffused light source, which solves the problems of large size, high price, and short lifespan of halogen light sources in the prior art. For example, the light source manufactured by a certain manufacturer has a size of 40mm×70mm×55mm and a wavelength range of 360 - 2500nm. Another example is the light source manufactured by another manufacturer, whose compact size is φ28.0mm×35.5mm. Through miniaturization design, the size of the entire light source of the present invention can reach φ25.0mm×22mm, making the entire light source easier to be integrated into portable devices and suitable for on-site rapid detection. The main technical concept of the present invention is to replace the halogen bulb with an LED light source, which has a smaller size, and in terms of cost-effectiveness, the cost of the LED light source is lower than that of the traditional halogen bulb, which is beneficial to reducing the manufacturing cost of the overall device. In terms of lifespan and stability, the lifespan of the LED light source far exceeds that of the halogen lamp, which can reduce the frequency of replacing the light source and the maintenance cost. And in terms of wavelength, the LED light source covers the wide wavelength range required by the near-infrared spectrum, enhancing the applicability of detection. However, when the inventor used the LED light source to replace the halogen light source, it was found that after the power was turned on, the intensity of the LED light source at each wavelength was different, resulting in unstable light source. After research, it was found that this was caused by the different supply voltages of each LED lamp bead 4. Therefore, it is applied to load different resistor sizes on each LED lamp bead 4 through debugging, so that the supply voltage of each LED lamp bead 4 is maintained at the same value, thereby maintaining the stability of the light source and the intensity of the spectral curve within the wavelength range consistent.

[0026] As Figure 1-2 shown, a portable coaxial diffused light source includes: an outer shell 1, and the outer shell 1 can be made of aluminum alloy. The aluminum alloy outer shell 1 provides the structural support and protection of the device, preventing the internal components from being physically damaged. At the same time, aluminum alloy has good heat dissipation performance, which helps the light source to dissipate heat during use to ensure the stability of the light source during use;

[0027] An optical fiber connector 2 is provided at one end of the housing 1. The optical fiber connector 2 is used to connect an optical fiber and a light source / spectrometer. The model of the optical fiber connector 2 can be selected as an SMA905 female head interface, which can be directly connected to an SMA905 male head optical fiber to realize the measurement of coaxial diffuse reflection. Through the optical fiber connector 2, the effective transmission of optical signals can be ensured, providing a stable optical connection;

[0028] A lamp board 3 is provided inside the housing 1. Multiple lamp beads 4 are provided on the lamp board 3. Each lamp bead 4 is loaded with a corresponding resistor to keep the intensity of the spectral curve emitted by each lamp bead 4 consistent. Among them, LED lamp beads 4 with different wavelengths are provided on the lamp board 3 to provide near-infrared spectral outputs of 900nm, 1200nm, 1550nm, 1650nm, and 1720nm. Light sources with different wavelengths can meet different spectral detection requirements. Every two lamp beads 4 form a group, and the included angle between each two lamp beads 4 is 45°.

[0029] Moreover, for the circuit connection method between the lamp beads 4, if the five lamp beads 4 are simply connected in series, because the supply voltage of each resistor is different and the load is different after the power is turned on, the intensity of the LED light source of each wavelength will be different, resulting in an unstable light source. In this case, by adjusting and loading different resistor sizes for the five LED lamp beads 4, and the lamp is equipped with a voltage stabilizing board, the current of each lamp can be adjusted independently on the voltage stabilizing board. By combining the two adjustment methods, the intensity of the spectral curve in the wavelength range of 900 - 1720nm is ensured to be consistent, improving the stability of the light source. See the following table for details:

[0030]

[0031]

[0032] At the same time, the lamp beads 4 are equipped with a voltage stabilizing board, so that the current of each lamp bead 4 can be adjusted independently on the voltage stabilizing board. By combining the resistor adjustment and the voltage stabilizing board adjustment, the spectral intensity emitted by each lamp bead 4 is kept consistent;

[0033] A reflective film is provided inside the housing 1, which is used to enable all near-infrared light sources to be diffusely reflected. The near-infrared light source emits light from the interface of the optical fiber connector 2 and then is transmitted to the spectrometer to ensure the light receiving efficiency

[0034] Among them, for the reflective film, a PC reflective film can be selected. For the selection of the PC reflective film, due to the limitation of the size of the entire LED light source, the reflective film can adopt a frosted diffuse reflection material to evenly distribute the light inside the LED light source and then output it through the optical fiber connector 2.

[0035] Optionally, a quartz glass 5 is also provided inside the housing. In some embodiments, the quartz glass 5 is an anti-fog and anti-fingerprint quartz glass 5. On the one hand, it can prevent people from touching the light source and leaving other interfering information such as fingerprints, which may affect the measurement results. By providing the quartz glass 5, the optical path of the LED light can also be increased in the overall structure of the small-sized LED light source. In addition, the thickness of the quartz glass 5 will affect the reflected light signal of the object to be measured. After multiple experimental verifications, in this case, the thickness of the quartz glass 5 is 2 mm, which can effectively avoid the problem that when the quartz glass 5 is too thin, it may be damaged due to uneven force during use, and when it is too thick, it will lead to an increase in the optical path and affect the measurement results.

[0036] Optionally, a radiator 6 is provided on the back of the lamp board 3. The radiator 6 is disposed inside the housing 1, and the radiator 6 is used to dissipate heat from the lamp board 3 and the lamp beads 4. Optionally, both the housing 1 and the radiator 6 are made of aluminum alloy material. The radiator 6 is a hollow gear-shaped structure. By using aluminum alloy material, the heat dissipation effect can be effectively improved. At the same time, due to its gear-shaped structure, the heat dissipation effect is also effectively improved. In actual tests, when the LED light source is lit and then turned off after the test is completed, with the aluminum alloy radiator 6 and the anti-fog and anti-fingerprint quartz glass 5, it is ensured that there are no water droplets or fog inside the LED light source. In addition, the LED light source has a short stabilization time, which is convenient for application in near-infrared spectroscopy detection applications.

[0037] Optionally, by collocating a 5V, 600mA voltage and current stabilizing chip, the stability of the voltage and current of the LED light source is ensured, and thus the stability of the spectrum of the LED light source is ensured.

[0038] Optionally, a sealing ring 7 is connected between the aluminum alloy housing 1 and other components. In some embodiments, the sealing ring 7 is made of silica gel material, which can prevent moisture and dust from entering the device interior and ensure the protection performance and reliability of the device.

[0039] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A portable coaxial diffuse reflection light source, characterized in that: Including housing; An optical fiber connector is disposed at one end of the housing, and is used to connect an optical fiber and a light source / spectrometer; A lamp board is arranged in the housing, and a plurality of lamp beads are arranged on the lamp board, wherein each lamp bead is loaded with a corresponding resistor, and the lamp bead is equipped with a voltage stabilizing board, so that the current of each lamp bead can be individually adjusted on the voltage stabilizing board, and the spectral intensity emitted by each lamp bead is kept consistent by combining the two adjustment methods; The reflective film is arranged inside the shell and is used to make the near-infrared light source fully diffusely reflective.

2. The portable coaxial diffuse reflection light source according to claim 1, characterized in that: It also includes quartz glass, which is used to protect the lamp board and the lamp beads.

3. The portable coaxial diffuse reflection light source according to claim 1, characterized in that: The lamp beads are LED lamp beads.

4. The portable coaxial diffuse reflection light source according to claim 1, characterized in that: The wavelength range of multiple lamp beads is 900-1720nm.

5. The portable coaxial diffuse reflection light source according to claim 1, characterized in that: The number of the lamp beads is set to five, and each lamp bead is connected to a load resistor so that the power supply voltage of the lamp bead is maintained at 1.8V.

6. The portable coaxial diffuse reflection light source according to claim 1, characterized in that: The angle between each of the lamp beads is 45°.

7. The portable coaxial diffuse reflection light source according to claim 1, characterized in that: A radiator is arranged on the back of the lamp board, and the radiator is arranged inside the shell. The radiator is used to dissipate heat from the lamp board and lamp beads.

8. The portable coaxial diffuse reflection light source according to claim 7, characterized in that: The shell and the radiator are both made of aluminum alloy, and the radiator is a hollow gear-shaped structure.

9. The portable coaxial diffuse reflection light source according to claim 1, characterized in that: The reflective film is a PC reflective film, and the PC reflective film is frosted.

10. The portable coaxial diffuse reflection light source according to claim 1, characterized in that: It also includes a 5V, 600mA voltage and current stabilizing chip, which is used to maintain the stability of the voltage and current of the lamp beads.

Images