CN110186587B - Fluorescence temperature measurement method - Google Patents
Fluorescence temperature measurement method Download PDFInfo
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- CN110186587B CN110186587B CN201910626850.5A CN201910626850A CN110186587B CN 110186587 B CN110186587 B CN 110186587B CN 201910626850 A CN201910626850 A CN 201910626850A CN 110186587 B CN110186587 B CN 110186587B
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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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- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The invention relates to a fluorescence temperature measurement method, mainly illustrating a method for measuring temperature by using fluorescence intensity of liquid. When the fluorescent liquid expands with heat and contracts with cold, the height of the liquid column above the liquid storage tank changes, and under the irradiation of uniform exciting light, the total fluorescence intensity of the liquid column changes corresponding to the temperature, or the temperature change can be reflected as the change of the ratio of the total fluorescence intensity of the liquid column to the exciting light intensity. The method has the advantages of safety, reliability, immunity from electromagnetic interference, wireless transmission of signals, visual observation and judgment of real-time temperature and the like.
Description
Technical Field
The invention relates to a method for optically and wirelessly measuring temperature, in particular to a fluorescence temperature measuring method.
Background
The temperature measurement method comprises the expansion type temperature measurement, the electric quantity type temperature measurement, the photoelectric type temperature measurement, the thermochromatic type temperature measurement and the like, wherein the expansion type temperature measurement device has the advantages of simplicity, reliability and low cost, the use mode of the device is that the indicating scale corresponding to the expansion of a body or the linear expansion is directly read by naked eyes generally, but if the indicating scale is converted into an electric signal to be output, on one hand, the possibility of discharge exists, and the device is not suitable for being applied to combustible gas environments such as mines and oil and gas; on the other hand, electromagnetic interference exists, and the temperature measuring method is not suitable for temperature measurement of strong electromagnetic field environments such as power transformation equipment.
The invention combines the expansion type temperature measurement technology with the fluorescence phenomenon, retains the advantages of the expansion type temperature measurement technology, and has the typical advantages of the optical measurement technology, including immune electromagnetic interference, wireless measurement and the like.
Disclosure of Invention
The invention aims to provide an optical temperature measurement method for bearing temperature signals by using fluorescence, which has the advantages of an expansion temperature measurement technology and an optical temperature measurement technology. The fluorescence temperature measurement method is different from a common fluorescence life method which measures temperature by utilizing a temperature quenching mechanism of fluorescence, and utilizes the expansion and contraction of liquid which generates fluorescence to change the height of a liquid column above a liquid storage tank, so that the proportion of the total fluorescence intensity of the liquid column to the excitation light intensity under a stable and uniform excitation condition is changed, and finally the proportion value is linearly dependent on a temperature value. The method can not only monitor the temperature wirelessly through fluorescence, but also judge the temperature by observing the height of the liquid column visually. The method can also directly realize the fluorescence type sensing of the liquid level.
The technical scheme of the invention is as follows: a fluorescence temperature measurement method comprises recording fluorescence intensity of an expanded liquid column at a known temperature based on a fluorescence liquid material, comparing the fluorescence intensity with the intensity of incident exciting light, fitting the rule that the obtained intensity ratio changes along with the temperature to obtain a temperature sensing equation, substituting the intensity ratio measured at the unknown temperature into the sensing equation to obtain measured temperature; the method is characterized by comprising the following steps:
filling a liquid storage tank with a fluorescent liquid material, and allowing liquid expanded along with the rise of the environmental temperature to enter a vacuum glass capillary tube connected with the liquid storage tank to form a liquid column;
measuring and recording the fluorescence intensity of the liquid column in the capillary, and calibrating the temperature sensing curve of the fluorescent material; the method comprises the following specific steps;
step 2-1, gradually setting and changing the ambient temperature of the solution within a certain temperature range;
2-2, measuring and recording the fluorescence intensity of the solution at each temperature in the step 2-1;
step 2-3, calculating the intensity ratio of the fluorescence intensity of the solution to the incident light intensity;
step 2-4, fitting to obtain a relation function of the intensity ratio and the temperature in the step 2-3;
and step three, placing the fluorescent liquid material in an unknown temperature environment, exciting the fluorescence of the liquid column, recording the fluorescence intensity and the incident light intensity of the fluorescence, and substituting the recorded fluorescence intensity and incident light intensity into the relation function obtained in the step 2-4 to obtain a temperature value to be measured.
The height of the liquid column reflects the temperature, and the height of the liquid column can be observed by naked eyes to judge the temperature value, namely the conventional expansion type temperature measurement mode.
When the excitation light uniformly illuminates the whole capillary tube, including the space not filled by the liquid column, the liquid column is excited to fluoresce by the uniform excitation light, and the total intensity of the fluorescence is proportional to the height of the liquid column because the total intensity of the fluorescence in the case of uniform excitation is proportional to the total amount of the fluorescent substance excited. The temperature quenching effect of the used fluorescent liquid material is not significant within the application temperature range of the scheme.
The ratio of the total fluorescence intensity of the liquid column to the excitation light intensity is linearly dependent on the temperature. Even the excitation light intensity fluctuation does not affect this dependency.
The method described can also be used only for detecting the height of the liquid column, i.e. the liquid level, whether or not the liquid level is temperature-dependent, whether or not the change in the liquid level is caused by a change in temperature.
The invention has the beneficial effects that: the method mainly explains the method for measuring the temperature by utilizing the fluorescence intensity of the liquid, the liquid with fluorescence expands with heat and contracts with cold, the height of a liquid column above a liquid storage tank of the liquid changes along with the expansion, and under the irradiation of uniform exciting light, the total fluorescence intensity of the liquid column changes corresponding to the temperature, or the temperature change can also be reflected as the change of the proportion of the total fluorescence intensity of the liquid column to the exciting light intensity. The method has the advantages of safety, reliability, immunity from electromagnetic interference, wireless transmission of signals, visual observation and judgment of real-time temperature and the like.
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FIG. 1 is a schematic diagram of an exemplary structure of a sensing system corresponding to the fluorescence temperature measurement method of the present invention;
in the figure: 1. an excitation light source; 2. a capillary tube; 3. a liquid column; 4. a liquid storage tank; 5. a fiber optic bundle; 6. and (5) collimating the light path.
Detailed Description
The present invention is further described in detail in the following description and specific examples, which are provided for the purpose of illustration only and are not intended to limit the scope of the present invention. The test methods used in the following examples are all conventional methods unless otherwise specified; the materials, reagents and the like used are, unless otherwise specified, commercially available reagents and materials.
The present disclosure describes, in part, a method for measuring temperature using fluorescence intensity. In the following examples, alcohol solution of rhodamine-based fluorescent dye is used as the fluorescent liquid material, and the test system is composed as shown in fig. 1 and mainly comprises an excitation light source 1, a capillary 2, a liquid column 3, a liquid storage tank 4, an optical fiber bundle 5 and a collimation light path 6. The specific description is as follows: the liquid storage tank 4 is filled with liquid, the liquid storage tank 4 is connected with a vacuum glass capillary tube 2, and the liquid which is thermally expanded enters the capillary tube 2 to form a partially filled liquid column 3. Wherein, one side of the capillary is provided with an exciting light source 1, and exciting light emitted by the linear exciting light source 1 uniformly irradiates the capillary 2. On the other side of the capillary 2, the transmitted light, which includes part of the excitation light and the fluorescence emitted by the liquid column 3, is collected by a fiber bundle 5. The collimation light path 6 converges the transmitted light in the form of a lens group and converts the converged light into parallel light, then the parallel light is subjected to light splitting and light filtering in sequence through an interference filter set, the separated fluorescence and exciting light are respectively subjected to intensity detection through a photoelectric conversion element, and then the intensity is output and displayed after proportional operation.
Gradually setting and changing the ambient temperature of the solution within the temperature range of 0-40 ℃, and measuring and recording the fluorescence intensity A and the excitation light intensity B of the solution at the known ambient temperature.
And calculating the ratio of the fluorescence intensity of the rhodamine alcohol solution to the excitation light intensity, fitting the data relation between the intensity ratio and the temperature, wherein the corresponding relation function is the temperature sensing equation for calibrating the test system.
The test system is placed in an unknown temperature environment, the fluorescence intensity ratio and the exciting light intensity ratio of the test system are measured under the same test condition, and the fluorescence intensity ratio and the exciting light intensity ratio are substituted into the previously calibrated temperature sensing equation, so that the temperature value to be measured is obtained.
The above examples are only for illustrating the technical solutions of the present invention and do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (2)
1. A fluorescence temperature measurement method comprises recording fluorescence intensity of an expanded liquid column at a known temperature based on a fluorescence liquid material, comparing the fluorescence intensity with the intensity of incident exciting light, fitting the rule that the obtained intensity ratio changes along with the temperature to obtain a temperature sensing equation, substituting the intensity ratio measured at the unknown temperature into the sensing equation to obtain measured temperature; the method is characterized by comprising the following steps:
filling a liquid storage tank with a fluorescent liquid material, and allowing liquid expanded along with the rise of the environmental temperature to enter a vacuum glass capillary tube connected with the liquid storage tank to form a liquid column, wherein the height of the liquid column reflects the temperature;
secondly, when the exciting light uniformly irradiates the whole capillary, the liquid column is excited by the uniform exciting light to emit fluorescence, the total intensity of the fluorescence is in direct proportion to the height of the liquid column, the ratio of the total fluorescence intensity of the liquid column to the exciting light intensity and the temperature are in a linear dependence relationship, the fluorescence intensity of the liquid column in the capillary is measured and recorded, and the temperature sensing curve of the fluorescent material is calibrated; the method comprises the following specific steps:
step 2-1, gradually setting and changing the ambient temperature of the solution within a certain temperature range;
2-2, measuring and recording the fluorescence intensity of the solution at each temperature in the step 2-1;
step 2-3, calculating the intensity ratio of the fluorescence intensity of the solution to the incident light intensity;
step 2-4, fitting to obtain a relation function of the intensity ratio and the temperature in the step 2-3;
and step three, placing the fluorescent liquid material in an unknown temperature environment, exciting the fluorescence of the liquid column, recording the fluorescence intensity and the incident light intensity of the fluorescence, and substituting the recorded fluorescence intensity and incident light intensity into the relation function obtained in the step 2-4 to obtain a temperature value to be measured.
2. The fluorescence thermometry method of claim 1, wherein: the method described can also be used only for detecting the height of the liquid column, i.e. the liquid level, regardless of the relation between the liquid level and the temperature.
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| CN113379617B (en) * | 2021-04-29 | 2022-11-08 | 中国船舶重工集团公司第七一九研究所 | Post-processing method for fluid temperature field image in flow channel |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1446493A1 (en) * | 1987-01-12 | 1988-12-23 | Уфимский авиационный институт им.Серго Орджоникидзе | Digital thermometer |
| CN101133307A (en) * | 2006-03-13 | 2008-02-27 | 陈东兵 | Over-temperature alarm display device |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1097249A (en) * | 1993-09-25 | 1995-01-11 | 王国璋 | Temperature detect switch (TDS) and special-purpose thermometer |
| CN1051636C (en) * | 1993-12-31 | 2000-04-19 | 王国璋 | Thermostatic device of temp. sensor thermometer |
| FR2806159B1 (en) * | 2000-03-09 | 2003-03-07 | Lorraine Inst Nat Polytech | OPTICAL METHOD AND DEVICE FOR NON-INTRUSIVE TEMPERATURE MEASUREMENT IN A FLOWING LIQUID |
| CN102410886B (en) * | 2011-08-30 | 2014-02-05 | 深圳大学 | Fiber temperature sensor and measuring system thereof and signal processing method of system |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1446493A1 (en) * | 1987-01-12 | 1988-12-23 | Уфимский авиационный институт им.Серго Орджоникидзе | Digital thermometer |
| CN101133307A (en) * | 2006-03-13 | 2008-02-27 | 陈东兵 | Over-temperature alarm display device |
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