CN112013988A - Dual-wavelength laser temperature measuring device based on optical fiber transmission signals - Google Patents
Dual-wavelength laser temperature measuring device based on optical fiber transmission signals Download PDFInfo
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- CN112013988A CN112013988A CN202011081314.0A CN202011081314A CN112013988A CN 112013988 A CN112013988 A CN 112013988A CN 202011081314 A CN202011081314 A CN 202011081314A CN 112013988 A CN112013988 A CN 112013988A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/006—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using measurement of the effect of a material on microwaves or longer electromagnetic waves, e.g. measuring temperature via microwaves emitted by the object
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C23/00—Non-electrical signal transmission systems, e.g. optical systems
- G08C23/06—Non-electrical signal transmission systems, e.g. optical systems through light guides, e.g. optical fibres
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Abstract
A dual wavelength laser temperature measuring device based on optical fiber transmission optical signals comprises: the first branch optical fiber is used for transmitting the laser with the first wavelength; the second branch optical fiber is used for transmitting the laser with the second wavelength; the third optical fiber is used for transmitting the first wavelength radiant energy of the target surface; the fourth optical fiber is used for transmitting the second wavelength radiant energy of the target surface; the optical fiber main path is used for collecting all the branch optical fibers and forming a uniform optical fiber end face; the optical fiber combiner is used for connecting the optical fiber branch and the optical fiber main path; the concave reflector is used for guiding the first and second wavelength laser signals and the target surface radiant energy; and the first photothermal effect detector and the second photothermal effect detector respectively convert the optical signals of the two wavelengths into electric signals. The device can effectively simplify the optical system of the dual-wavelength radiation temperature measuring device, reduce the complexity of the whole device, reduce the interference of the external environment to the temperature measuring process and improve the stability of measurement.
Description
Technical Field
The invention relates to the technical field of radiation temperature measurement, in particular to a dual-wavelength laser temperature measuring device based on optical fiber transmission signals.
Background
The dual-wavelength laser temperature measurement is a non-contact radiation temperature measurement method with wide application prospect, the emissivity of the target surface to be measured does not need to be obtained in advance, and the limitation of the traditional radiation temperature measurement method on the aspect of obtaining the emissivity of the surface of an object is eliminated.
The dual-wavelength laser temperature measuring device mainly comprises a laser emitting module, an optical signal transmission module, an optical signal receiving module, a signal processing module and the like. The optical signal transmission module is generally composed of optical elements such as reflectors, spectroscopes and lenses with different numbers, accurate matching is needed among the optical elements, complexity of the dual-wavelength laser temperature measuring device is increased by more optical elements, and certain challenges are brought to popularization and application of the temperature measuring device.
Therefore, the module of the device needs to be simplified, the overall complexity of the device is reduced, the interference of the external environment to the temperature measurement process is reduced, and the measurement stability is further improved.
Disclosure of Invention
The invention aims to provide a dual-wavelength laser temperature measuring device based on optical fiber transmission signals, which solves the problem of simplification of an optical signal transmission module and can reduce the complexity of the device.
In order to achieve the above object, the present invention provides a dual-wavelength laser temperature measuring device based on optical fiber transmission optical signal, which comprises:
a first branch optical fiber for transmitting the laser light of the first wavelength;
a second drop fiber for transmitting the second wavelength laser;
a third optical splitter for transmitting the first wavelength radiant energy of the target surface;
a fourth optical fiber for transmitting the second wavelength radiant energy of the target surface;
the optical fiber main path is used for collecting all the branch optical fibers and forming a uniform optical fiber end face;
the optical fiber combiner is used for connecting the optical fiber branch and the optical fiber main path;
the concave mirror reflecting mirror is used for collecting the first laser signal, the second laser signal and the target surface radiant energy;
a first laser transmitter that generates first laser light having a first wavelength;
a second laser transmitter that generates second laser light having a second wavelength;
the laser modulator is used for controlling the frequency of the laser emitted by the first laser emitter and the second laser emitter;
first and second detection paths that convert optical signals of two wavelengths into electrical signals, respectively;
the signal amplifier acquires and amplifies the electric signal;
the calculation circuit converts the amplified electric signal into a temperature value through a preset program;
the numerical value display displays the specific temperature value.
The fiber cores of the first to fourth optical fibers and the optical fiber main path have the diameter of 3-100 microns and are made of light guide materials with high refractive index, such as germanium dioxide doped with silicon dioxide in a certain proportion; the fiber core is covered by a cladding with the low outer diameter of 100-160 microns, and is made of a refractive index light guide material, such as silica doped with boron oxide in a certain proportion; the coating layer is respectively wrapped by the primary coating layer and the secondary coating layer, so that the effects of protecting and improving the strength are achieved.
The optical fiber combiner integrates the first to fourth optical fibers and then is connected with the optical fiber main line;
the reflecting mirror is a concave mirror reflecting mirror, and reflects laser emitted from the end face of the optical fiber main path to the target surface and simultaneously reflects a thermal radiation optical signal of the target surface to the end face of the optical fiber main path.
Wherein, laser modulator, first laser emitter and second laser emitter constitute laser emission module: the central wavelength of the laser emitted by the first laser emitter is 900-1200nm, and the power is 1-9W; the central wavelength of the laser emitted by the second laser emitter is 1300-1800nm, and the power is 1-9W; and the laser modulator is used for outputting high and low level signals through the function generator to control the power supply of the laser transmitter so as to realize the required laser frequency modulation function.
Wherein, the first detection path comprises a first collimating lens group, a first optical filter and a first photothermal effect detector: the wavelength range of the working center of the first optical filter is 900-1200nm, and the bandwidth is 3-25 nm; the first photothermal effect detector core component is formed by adopting a photoelectric material and can convert an optical signal into an electric signal; the filter needs to be matched with a constant temperature auxiliary system, so that the working temperature of the filter is kept constant.
Wherein, the second detection path comprises a second collimating lens group, a second optical filter and a second photothermal effect detector: the working center wavelength range of the second optical filter is 1300-1800nm, and the bandwidth is 5-50 nm; the second photothermal effect detector core component is formed by adopting a photoelectric material and can convert an optical signal into an electric signal; the filter needs to be matched with a constant temperature auxiliary system, so that the working temperature of the filter is kept constant.
The amplifier comprises a low noise amplifier and a phase-locked amplifier, the computing circuit converts the received electric signals into temperature values through a preset computing program, and the display is used for displaying the measured target surface temperature values.
It can be seen from the above technical solution of the dual-wavelength laser temperature measuring device based on optical fiber transmission optical signal of the present invention that the system core component of the present invention comprises: the device comprises a laser emission module, an optical signal transmission module, a first detection channel and a second detection channel. Through the cooperative work of the laser emission module and the first and second detection access systems, the accurate measurement of the surface temperature can be realized under the condition that the surface emissivity of an object is unknown; the optical signal transmission module is used for transmitting the laser generated by the first laser generator and the second laser generator and the radiant energy emitted by the target surface.
The invention provides a dual-wavelength laser temperature measuring device based on optical fiber transmission optical signals, which transmits signals such as infrared laser, target surface radiation energy and the like through optical fibers, so that an optical signal transmission module of the dual-wavelength radiation temperature measuring device is effectively simplified, the complexity of the whole device is reduced, the interference of an external environment on a temperature measuring process is reduced, and the stability of measurement is further improved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic diagram of a dual-wavelength laser temperature measuring device based on optical fiber transmission of optical signals according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or coupled. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
To facilitate understanding of the embodiments of the present invention, the following description will be further explained by taking specific embodiments as examples with reference to the accompanying drawings.
Examples
Fig. 1 is a schematic diagram of a dual-wavelength laser temperature measuring device based on optical fiber transmission signals according to an embodiment of the present invention. As shown in fig. 1, the temperature measuring device includes: a laser modulator 1 for outputting high and low level signals of different frequencies; a first laser transmitter 2 that generates first laser light having a first wavelength; a second laser transmitter 3 that generates second laser light having a second wavelength; the laser modulator 1 is connected with the first laser emitter 2 and the second laser emitter 3 to form a laser emitting module, the first laser emitter 2 or the second laser emitter 3 is controlled to generate laser with required frequency through high and low level signals output by the laser modulator 1, and the laser light source system is not limited to the laser modulator 1, the first laser emitter 2 and the second laser emitter 3 and can also comprise other optical and electrical components.
Wherein, laser modulator 1, first laser emitter 2 and second laser emitter 3 cooperate each other as laser emission module: the central wavelength of the laser emitted by the first laser emitter 2 is 900-1200nm, and the power is 1-9W; the central wavelength of the laser emitted by the second laser emitter 3 is 1300nm-1800nm, and the power is 1-9W; the laser modulator 1 outputs high and low level signals through the function generator to directly control the power supply of the first laser transmitter 2 and the second laser transmitter 3, and therefore the required laser frequency modulation function is achieved.
Under the regulation and control of the laser modulator 1, first laser emitted by the first laser generator 2 enters the first branch optical fiber 4, enters the optical fiber bus 6 after passing through the optical fiber beam combiner 5, and reaches a target surface after passing through the concave reflector 7; the second laser emitted by the second laser generator 3 enters a second branch optical fiber 8, enters an optical fiber bus 6 after passing through an optical fiber beam combiner 5, and reaches a target surface after passing through a concave reflector 7; the target surface generates temperature rise delta T under the heating of laser, and the radiant energy emitted by the target surface in a certain solid angle enters the optical fiber bus 6 after being reflected by the concave reflector 7, and enters the third optical fiber branch 9 and the fourth optical fiber branch 10 after passing through the optical fiber combiner 5; after a radiation signal of the target surface exits the third optical splitter 9, the radiation signal becomes a radiation beam with a central wavelength of a first wavelength under the action of the first collimating lens group 11 and the first optical filter 12, and then reaches the first photothermal effect detector 13; after a radiation signal of the target surface exits the fourth optical fiber 10, the radiation signal becomes a radiation beam with a central wavelength of a second wavelength under the action of a second collimating lens group 14 and a second optical filter 15, and then reaches a second photothermal effect detector 16; the first and second photothermal detectors 13 and 16 input the obtained electric signals to an amplifier 17, and a calculation circuit 18 converts the signals from the amplifier 17 into corresponding temperature values and displays them on a display instrument 19. The amplifier comprises a low noise amplifier and a phase-locked amplifier, and the computing circuit converts the received electric signal into a temperature value according to a preset computing program.
The first to fourth optical fibers (4, 8, 9, 10), the optical fiber combiner 5, the optical fiber bus 6 and the concave reflector group 7 are mutually matched to serve as an optical signal transmission module for transmitting laser light generated by the first and second laser emitters (2, 3) and radiation energy emitted by a target surface, and the optical signal transmission module is not limited to the components and can also comprise or be replaced by other optical elements; the first collimating lens group 11, the first optical filter 12 and the first photothermal effect detector 13 are mutually matched to serve as a first detection passage, the working center wavelength range of the first optical filter 12 is preferably 900-1200nm, and the bandwidth is preferably 3-25 nm; the second collimating lens group 14, the second optical filter 15 and the second photothermal effect detector 16 are mutually matched to serve as a second detection channel, the working center wavelength range of the second optical filter 15 is preferably 1300-1800nm, and the bandwidth is preferably 5-50 nm; and the filters in the first detection passage and the second detection passage are required to be matched with a constant-temperature auxiliary system, so that the working temperature of the filters is kept constant.
The specific process of radiation temperature measurement by adopting the measuring device comprises the following steps:
firstly, the laser modulator 1 outputs high and low level signals to directly control the power supply of the laser transmitter, and the first laser transmitter 2 emits the using wavelength lambda1(980nm) laser beams enter the first branch optical fiber 4 for transmission, enter the optical fiber bus 6 after passing through the optical fiber beam combiner 5, are reflected to a target surface by the concave reflector 7 after exiting the end surface of the optical fiber bus 6 and generate temperature rise delta T1. The radiation energy emitted by the target surface in a certain solid angle is reflected to the optical fiber bus 6 by the objective concave reflector 7 and transmitted to the fourth optical fiber 10 by the optical fiber beam combiner 5, and the central wavelength is lambda2The radiation beam (1550nm) passes through the second collimating lens group 14 and the second optical filter 15, and then reaches the second photothermal effect detector 16, where the photo-current I is generated by the photothermal effectp(λ2)。
Similarly, the laser modulator 1 outputs high and low level signals to directly control the power supply of the laser, and the second laser transmitter 3 uses the wavelength lambda2A (1550nm) laser beam enters the second branch optical fiber 8 for transmission, enters the optical fiber bus 6 after passing through the optical fiber combiner 5, and is reflected to a target surface by the concave reflector 7 after exiting the end surface of the optical fiber bus 6 to generate temperature rise delta T2. The radiation energy emitted by the target surface in a certain solid angle is reflected to the optical fiber bus by the objective concave reflector 7 and transmitted, and reaches the third optical fiber branch 9 after passing through the optical fiber beam combiner 5, wherein the central wavelength is lambda1The (980nm) radiation beam penetrates through the first collimating lens group 11 and the first optical filter 12 and then reaches the second photothermal effect detector 13, and generates a photocurrent I under the action of photothermal effectp(λ1)。
Ip(λ2) And Ip(λ1) Variable separation can be performed to obtain the surface area from the target at lambda1And λ2Ratio of product composition of surface emissivity at two wavelengthsThe coefficients are illustrated. Will Ip(λ2) And Ip(λ1) And the influence of emissivity can be eliminated by dividing. Due to Ip(λ2) And Ip(λ1) The ratio of (a) is related only to the instrument constant, the wavelength, the second radiation constant, and the target surface temperature, and the instrument constant can be accurately determined by laboratory calibration. Under such conditions, therefore, by Ip(λ2) And Ip(λ1) The surface temperature of the measured target can be obtained through conversion according to the ratio, the algorithm is programmed and is preset in a calculating circuit in advance, and the electric signal can be converted into a temperature value in the measuring process.
The invention provides a dual-wavelength laser temperature measuring device based on optical fiber transmission optical signals, which can realize the accurate measurement of the surface temperature under the condition that the surface emissivity of an object is unknown through the cooperative work of a laser emission module, an optical signal transmission module, a first detection access system and a second detection access system; the laser generated by the first laser generator and the second laser generator and the radiant energy emitted by the target surface are transmitted through the optical fiber, the optical signal transmission module is effectively simplified, the complexity of the whole device is reduced, the interference of the external environment to the temperature measurement process is reduced, and the measurement stability is further improved.
It will be appreciated by those skilled in the art that the foregoing types of applications are merely exemplary, and that other types of applications, whether presently existing or later to be developed, that may be suitable for use with the embodiments of the present invention, are also intended to be encompassed within the scope of the present invention and are hereby incorporated by reference.
It will be appreciated by those skilled in the art that the number of various elements shown in fig. 1 for simplicity only may be less than that in an actual system, but such omissions are clearly not to be made without affecting the clarity and completeness of the disclosure of the embodiments of the invention.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A dual wavelength laser temperature measuring device based on optical fiber transmission signals comprises:
a first laser transmitter that generates first laser light having a first wavelength;
a second laser transmitter that generates second laser light having a second wavelength;
the laser modulator is used for controlling the frequency of the laser emitted by the first laser emitter and the second laser emitter;
the first branch optical fiber is used for transmitting the laser with the first wavelength;
the second branch optical fiber is used for transmitting the laser with the second wavelength;
the third optical splitter is used for transmitting the radiant energy with the first wavelength generated by the target surface;
the fourth optical fiber is used for transmitting the second wavelength radiant energy generated by the target surface;
the optical fiber bus is used for collecting all the branch optical fibers and forming a uniform optical fiber end face;
the optical fiber combiner is used for connecting the first to fourth optical fibers and the optical fiber bus;
the concave mirror reflecting mirror is used for guiding the first laser signal, the second laser signal and the target surface radiant energy;
and detecting the passage and converting the optical signal into an electric signal.
2. The apparatus of claim 1, wherein the first to fourth optical fibers and the optical fiber trunk have a core diameter of 3-100 μm and are made of a light-guiding material with a high refractive index.
3. The apparatus of claim 1, wherein the optical combiner combines the first through fourth optical fibers to connect to the optical fiber bus.
4. The apparatus of claim 1, wherein the concave mirror reflects the laser light emitted from the fiber bus end surface to the target surface and also reflects the thermal radiation optical signal from the target surface to the fiber bus end surface.
5. The apparatus as claimed in claim 1, wherein the first laser emitter emits laser light with a central wavelength of 900-1200nm and a power of 1-9W; the central wavelength of the laser emitted by the second laser emitter is 1300-1800nm, and the power is 1-9W.
6. The apparatus of claim 1, wherein the detection path comprises a collimating lens group, a filter, and a photothermal effect detector.
7. The apparatus as claimed in claim 5, wherein the wavelength range of the working center of the filter is 1300-1800nm, and the bandwidth is 5-50 nm; the photothermal effect detector can convert an optical signal into an electrical signal.
8. The apparatus of claim 1, further comprising an amplifier, a computing circuit, and a display.
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| CN202011081314.0A CN112013988A (en) | 2020-10-10 | 2020-10-10 | Dual-wavelength laser temperature measuring device based on optical fiber transmission signals |
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| CN202011081314.0A CN112013988A (en) | 2020-10-10 | 2020-10-10 | Dual-wavelength laser temperature measuring device based on optical fiber transmission signals |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114336264A (en) * | 2021-03-19 | 2022-04-12 | 武汉仟目激光有限公司 | Laser detection method based on dual-wavelength laser |
| CN114646787A (en) * | 2022-05-18 | 2022-06-21 | 苏州联讯仪器有限公司 | Chip test probe and chip test device |
-
2020
- 2020-10-10 CN CN202011081314.0A patent/CN112013988A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114336264A (en) * | 2021-03-19 | 2022-04-12 | 武汉仟目激光有限公司 | Laser detection method based on dual-wavelength laser |
| CN114646787A (en) * | 2022-05-18 | 2022-06-21 | 苏州联讯仪器有限公司 | Chip test probe and chip test device |
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