CN116046715A - Multi-wavelength near infrared light source for measuring water content of field surface combustible - Google Patents

Multi-wavelength near infrared light source for measuring water content of field surface combustible Download PDF

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Publication number
CN116046715A
CN116046715A CN202310084664.XA CN202310084664A CN116046715A CN 116046715 A CN116046715 A CN 116046715A CN 202310084664 A CN202310084664 A CN 202310084664A CN 116046715 A CN116046715 A CN 116046715A
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light source
led
measuring
near infrared
array chip
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舒海东
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Shanghai Shizhao Communication Technology Co ltd
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Shanghai Shizhao Communication Technology Co ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
    • G01N21/359—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using near infrared light
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V14/00—Controlling the distribution of the light emitted by adjustment of elements
    • F21V14/06—Controlling the distribution of the light emitted by adjustment of elements by movement of refractors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V23/00—Arrangement of electric circuit elements in or on lighting devices
    • F21V23/003—Arrangement of electric circuit elements in or on lighting devices the elements being electronics drivers or controllers for operating the light source, e.g. for a LED array
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • F21V5/04—Refractors for light sources of lens shape
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/01—Arrangements or apparatus for facilitating the optical investigation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
    • G01N21/3554—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for determining moisture content
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/345—Current stabilisation; Maintaining constant current
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2201/00—Features of devices classified in G01N21/00
    • G01N2201/06—Illumination; Optics
    • G01N2201/062—LED's
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2201/00—Features of devices classified in G01N21/00
    • G01N2201/06—Illumination; Optics
    • G01N2201/062—LED's
    • G01N2201/0623—Use of a reference LED

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  • Spectroscopy & Molecular Physics (AREA)
  • Engineering & Computer Science (AREA)
  • Biochemistry (AREA)
  • Chemical & Material Sciences (AREA)
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  • Life Sciences & Earth Sciences (AREA)
  • General Health & Medical Sciences (AREA)
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  • Health & Medical Sciences (AREA)
  • General Engineering & Computer Science (AREA)
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  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

The invention discloses a multi-wavelength near infrared light source for measuring the water content of field ground surface combustible, wherein a measuring light source and a reference light source are fixed on a substrate; the outer part of the glass lens is provided with a thread focusing structure which is detachably connected with the LED array chip; the control circuit comprises a singlechip, a communication control module, an LED time sequence generation module and an LED constant current driving module which are electrically connected with the singlechip; the reference light source and the measuring light source are an LED array chip integrated with LED devices with different wavelengths, share the same projection optical system, and light the LED devices with different wavelengths on the chip in a time sequence power-on mode in a time-sharing mode, so that the functions of time-sharing emitting reference light and measuring light are realized, the system structure is greatly simplified, the product volume is reduced, the system reliability is improved, and the system is more suitable for long-term use in a field environment.

Description

Multi-wavelength near infrared light source for measuring water content of field surface combustible
Technical Field
The invention relates to the technical field of photoelectric measurement, in particular to a multi-wavelength near infrared light source for measuring the water content of field ground surface combustible.
Background
The water content of a sample is an important parameter to be detected in many industries. At present, the widely applied water content measuring method comprises the following steps: gravimetric, dielectric constant (including specifically frequency domain reflectometry FDR and time domain reflectometry TDR), microwave, and near infrared reflectometry. The gravimetric method is an internationally accepted standard method, and has accurate measurement results, but needs to be sampled and dried for a long time, has a certain destructiveness on the sample, and is not suitable for long-term fixed-point continuous monitoring. The TDR and the FDR are mainly used for measuring the soil moisture content, have higher measurement accuracy and no radioactivity, are suitable for long-term fixed-point observation, but are required to be arranged on site to contact with a measuring probe, and have high requirements on the installation of the probe. The microwave method can measure the average water content in the volume, has high measurement accuracy and high speed, can monitor on line for a long time, but is not suitable for measuring the water content of the soil surface due to the penetration of microwave energy into the soil. The near infrared reflection method utilizes the principle that near infrared wavelength energy can be absorbed by water molecules, and can invert the water content of the surface layer of the measurement sample by analyzing the change of the reflection energy of the measurement sample at a specific near infrared wavelength, thereby having the advantages of high speed, non-contact and convenience for long-term online monitoring.
The near infrared reflection method is used for measuring the water content, and the water content of the surface layer of the sample can be inverted by respectively irradiating the sample to be measured with near infrared wavelength (measuring light) with high water absorptivity and near infrared wavelength (reference light) with low water absorptivity and analyzing corresponding different reflection energy changes. The current methods for generating reference light and measuring light mainly comprise a laser light source method, a tungsten lamp and optical filter wheel method, a multi-path LED method which is arranged at a certain angle, and the like, and the defects of the existing methods are that the light source is expensive, the volume is large, the structure is complex, and moving parts which affect the reliability are often arranged. Therefore, there is a need to design a new multi-wavelength near infrared light source suitable for near infrared reflection.
Disclosure of Invention
The invention aims to provide a multi-wavelength near infrared light source capable of measuring moisture by a near infrared reflection method, so as to solve the technical defects of high light source cost, large volume, complex structure, moving parts and the like in the prior art.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: a multi-wavelength near infrared light source for measuring the water content of field ground surface combustible substances comprises an LED array chip, a projection optical system and a control circuit; the LED array chip comprises a diagonally arranged measuring light source, a diagonally arranged reference light source and a substrate, wherein the measuring light source and the reference light source are fixed on the substrate; the projection optical system comprises a glass lens, a threaded focusing structure which is detachably connected with the LED array chip is arranged outside the glass lens, the relative distance between the glass lens and the LED array chip is adjusted by rotating the threaded focusing structure, and then the divergence angle of a projection light beam is changed, so that a light spot is projected at a specified distance; the control circuit comprises a singlechip, a communication control module, an LED time sequence generation module and an LED constant current driving module, wherein the communication control module, the LED time sequence generation module and the LED constant current driving module are electrically connected with the singlechip; the communication control module is communicated with the external connection and receives the setting information of the repetition period and the power-on duration of the LED time sequence; the LED time sequence generating module generates an LED time sequence waveform according to the setting information received by the communication control module, and controls the LED constant current driving module to work, and the LED constant current driving module is connected with the LED array chip and enables the LED array chip to stably emit light according to the time sequence waveform.
Furthermore, the back of the substrate is provided with a heat dissipation area, and the measuring light source and the reference light source are both arranged on the front surface of the substrate and the bottom of the substrate is connected with the heat dissipation area.
Further, the outside of the measuring light source and the reference light source is wrapped by a resin lens.
Further, the measuring light source is two 1450nm wavelength LED devices arranged diagonally, and the reference light source is two 1300nm wavelength LED devices.
Further, the glass lens is a K9 glass convex lens with the diameter of 50mm and the focal length of 50 mm.
Further, by adjusting the relative distance between the lens and the LED array chip, the divergence angle of the projected beam is changed, and a light spot with a diameter larger than 200mm is projected on a distance of 1 m.
Compared with the prior art, the invention has the advantages that: the reference light source and the measuring light source are an LED array chip integrated with LED devices with different wavelengths, share the same projection optical system, and light the LED devices with different wavelengths on the chip in a time sequence power-on mode in a time-sharing mode, so that the functions of time-sharing emitting reference light and measuring light are realized, the system structure is greatly simplified, the product volume is reduced, the system reliability is improved, and the system is more suitable for long-term use in a field environment. The power-on time sequence is controlled by a circuit program, so that different reference light and measuring light irradiation beats can be realized, and different requirements of a near infrared reflection method measuring system can be better met.
Drawings
FIG. 1 is a schematic diagram of the structure of a multi-wavelength near infrared light source for measuring the water content of field surface combustibles.
Fig. 2 is a schematic diagram of the structure of an LED array chip.
Fig. 3 is a timing diagram of LED chip energization.
FIG. 4 is a flow chart of the operation of the multi-wavelength near infrared light source for measuring the water content of the field surface combustible according to the invention.
As shown in the figure: 1. the LED light source comprises an LED array chip, 2, a projection optical system, 3, a control circuit, 4, a measuring light source, 5, a reference light source, 6, a substrate, 7, a glass lens, 8, a thread focusing structure, 9, a singlechip, 10, a communication control module, 11, an LED time sequence generating module, 12, an LED constant current driving module, 13, a heat dissipation area, 14 and a resin lens.
Detailed Description
In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", "vertical", "circumferential", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
The invention further provides a multi-wavelength near infrared light source for measuring the water content of field surface combustibles, which is described in detail below with reference to the accompanying drawings.
The present invention will be described in detail with reference to fig. 1 to 4.
A multi-wavelength near infrared light source for measuring the water content of field ground surface combustibles comprises an LED array chip 1, a projection optical system 2 and a control circuit 3; the LED array chip 1 comprises a diagonally arranged measuring light source 4, a diagonally arranged reference light source 5 and a substrate 6, wherein the measuring light source 4 and the reference light source 5 are fixed on the substrate 6; the projection optical system 2 comprises a glass lens 7, a threaded focusing structure 8 which is detachably connected with the LED array chip 1 is arranged outside the glass lens 7, and the relative distance between the glass lens 7 and the LED array chip 1 is adjusted by rotating the threaded focusing structure 8 so as to change the divergence angle of a projection beam, so that a light spot is projected at a specified distance; the control circuit 3 comprises a singlechip 9, a communication control module 10, an LED time sequence generating module 11 and an LED constant current driving module 12 which are electrically connected with the singlechip; the communication control module 10 is communicated with external connection and receives setting information of a repetition period and an energizing time length of an LED time sequence; the LED time sequence generating module 11 generates an LED time sequence waveform according to the setting information received by the communication control module 10, controls the LED constant current driving module 12 to work, and the LED constant current driving module 12 is connected with the LED array chip 1 and enables the LED array chip to stably emit light according to the time sequence waveform.
The back of the substrate 6 is provided with a heat dissipation area 13, the measuring light source 4 and the reference light source 5 are arranged on the front of the substrate 6, and the bottom of the measuring light source and the reference light source are connected with the heat dissipation area 13; the outside of the measuring light source 4 and the reference light source 5 is wrapped by a resin lens 14; the measuring light source 4 is two 1450nm wavelength LED devices arranged diagonally, and the reference light source 5 is two 1300nm wavelength LED devices.
The glass lens 7 is a K9 glass convex lens with the diameter of 50mm and the focal length of 50 mm; by adjusting the relative distance between the lens and the LED array chip 1, the divergence angle of the projected beam was changed, and a spot larger than 200mm in diameter was projected over a distance of 1 m.
The invention discloses a multi-wavelength near infrared light source for measuring the water content of field surface combustible, which comprises the following specific implementation processes:
the multi-wavelength near infrared light source consists of an LED array chip 1, a projection optical system 2 and a control circuit 3; the LED array chip 1 is a 2×2LED array chip 1 composed of two 1450nm wavelength LED devices (i.e., measurement light source 4) and two 1300nm wavelength LED devices (i.e., reference light source 5) arranged diagonally. The 2×2 diagonally arranged LED devices are close to each other and have better symmetry, which helps to make the light spot projected by the projection optical system 2 more uniform.
The projection optical system 2 is a lens type or reflective bowl type optical system shared by the LED array chips 1, and can project near infrared light emitted by the measuring light source 4/the reference light source 5 into a proper light beam, and form a spot with a proper size on the surface of a measured sample with a certain distance. The projection optical system 2 used in the present invention is a K9 glass lens 7 having a diameter of 50mm and a focal length of 50 mm. The optical system is designed with a threaded focusing mechanism, and the divergence angle of the projection beam can be changed by adjusting the relative distance between the lens and the LED array chip 1, so that a light spot with a diameter larger than 200mm can be projected on a distance of 1 m.
The control circuit 3 is a circuit board based on an STM32 singlechip 9 chip. The control circuit 3 comprises a communication control module 10, an LED time sequence generation module 11, an LED constant current driving module 12 and other circuit structures. The communication control module 10 of the control circuit 3 communicates with the outside and can receive the setting information such as the repetition period, the energizing time length and the like of the LED time sequence; the LED timing generation module 11 of the control circuit 3 generates an LED timing waveform according to the received setting information, and controls the LED constant current driving module 12 to work, so that LED devices with different wavelengths emit light stably according to the timing waveform.
According to the invention, a fixed LED array chip 1 is adopted as a luminous light source, LED devices with different wavelengths share the same projection optical system 2, the LED time sequence is electrified to work, moving parts are removed, the system integration level is improved, the system structure is greatly simplified, the product volume is reduced, the system reliability is improved, and the LED light source is more suitable for long-term use in a field environment.
The invention and its embodiments have been described above with no limitation, and the actual construction is not limited to the embodiments of the invention as shown in the drawings. In summary, if one of ordinary skill in the art is informed by this disclosure, a structural manner and an embodiment similar to the technical solution should not be creatively devised without departing from the gist of the present invention.

Claims (6)

1. A multi-wavelength near infrared light source for measuring the water content of field ground surface combustible materials is characterized in that: comprises an LED array chip (1), a projection optical system (2) and a control circuit (3);
the LED array chip (1) comprises a diagonally arranged measuring light source (4), a diagonally arranged reference light source (5) and a substrate (6), wherein the measuring light source (4) and the reference light source (5) are fixed on the substrate (6);
the projection optical system (2) comprises a glass lens (7), a threaded focusing structure (8) detachably connected with the LED array chip (1) is arranged outside the glass lens (7), and the relative distance between the glass lens (7) and the LED array chip (1) is adjusted by rotating the threaded focusing structure (8) so as to change the divergence angle of a projection light beam, so that a light spot is projected at a specified distance;
the control circuit (3) comprises a singlechip (9), a communication control module (10), an LED time sequence generation module (11) and an LED constant current driving module (12), wherein the communication control module (10), the LED time sequence generation module and the LED constant current driving module are electrically connected with the singlechip; the communication control module (10) is communicated with the external connection and receives the setting information of the repetition period and the energizing duration of the LED time sequence; the LED timing sequence generating module (11) generates an LED timing sequence waveform according to the setting information received by the communication control module (10) and controls the LED constant current driving module (12) to work, and the LED constant current driving module (12) is connected with the LED array chip (1) and enables the LED array chip to stably emit light according to the timing sequence waveform.
2. The multi-wavelength near infrared light source for measuring the water content of field surface combustibles according to claim 1, wherein the multi-wavelength near infrared light source comprises: the back of the base plate (6) is provided with a heat dissipation area (13), and the measuring light source (4) and the reference light source (5) are arranged on the front of the base plate (6) and the bottom of the base plate is connected with the heat dissipation area (13).
3. The multi-wavelength near infrared light source for measuring the water content of field surface combustibles according to claim 2, wherein the multi-wavelength near infrared light source comprises: the measuring light source (4) and the reference light source (5) are externally wrapped by a resin lens (14).
4. A multi-wavelength near infrared light source for measuring the water content of field surface combustibles according to claim 3, wherein: the measuring light source (4) is two 1450nm wavelength LED devices which are arranged diagonally, and the reference light source (5) is two 1300nm wavelength LED devices.
5. A multi-wavelength near infrared light source for measuring the water content of field surface combustibles according to any one of claims 1 to 4, wherein: the glass lens (7) is a K9 glass convex lens with the diameter of 50mm and the focal length of 50 mm.
6. The multi-wavelength near infrared light source for measuring the water content of field surface combustibles according to claim 5, wherein the multi-wavelength near infrared light source comprises: by adjusting the relative distance between the lens and the LED array chip (1), the divergence angle of the projected light beam is changed, and a light spot with the diameter of more than 200mm is projected on the distance of 1 m.
CN202310084664.XA 2023-02-09 2023-02-09 Multi-wavelength near infrared light source for measuring water content of field surface combustible Pending CN116046715A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203202671U (en) * 2012-12-19 2013-09-18 深圳市光峰光电技术有限公司 Light-emitting device and lamp
CN103528989A (en) * 2013-10-30 2014-01-22 安徽鸿谱光电科技有限公司 Near-infrared moisture measurement instrument
CN107477424A (en) * 2017-01-13 2017-12-15 大连工业大学 A kind of varifocal optical system based on LED light source
CN111025317A (en) * 2019-12-28 2020-04-17 深圳奥比中光科技有限公司 Adjustable depth measuring device and measuring method
CN216247696U (en) * 2021-10-21 2022-04-08 吉林艾格瑞科技有限公司 Online infrared moisture content test system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203202671U (en) * 2012-12-19 2013-09-18 深圳市光峰光电技术有限公司 Light-emitting device and lamp
CN103528989A (en) * 2013-10-30 2014-01-22 安徽鸿谱光电科技有限公司 Near-infrared moisture measurement instrument
CN107477424A (en) * 2017-01-13 2017-12-15 大连工业大学 A kind of varifocal optical system based on LED light source
CN111025317A (en) * 2019-12-28 2020-04-17 深圳奥比中光科技有限公司 Adjustable depth measuring device and measuring method
CN216247696U (en) * 2021-10-21 2022-04-08 吉林艾格瑞科技有限公司 Online infrared moisture content test system

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Application publication date: 20230502