Optical temperature measurement apparatus and temperature measurement method

Abstract

An optical temperature measurement apparatus, relating to the technical field of performing temperature detection using optical methods. The optical temperature measurement apparatus comprises: a housing (1), an ultraviolet light-emitting part (2), a heat transfer part (3), a fluorescent part (4), a first optical grating (5), a second optical grating (6), a first condensing lens (7), a second condensing lens (8), a first optical probe (9), a second optical probe (10), a computation unit (11), and a light-blocking sheet (12). The use structure of the fluorescent part (4) is Ca2LaTaO6:xmol% Mn2+, ymol% Tb3+, x being the molar percentage of doped manganese ions Mn2+, 0.005≤x≤0.1, y being the molar percentage of doped terbium Tb3+, and 0.01≤y≤0.3. The described optical temperature measurement apparatus has a simple structure and low costs, and is convenient for use and temperature measurement.

Description

Optical temperature measuring device and temperature measuring method Technical Field

[0001] The present invention relates to the technical field of temperature detection using optical methods, and in particular to an optical temperature measurement device and method. Background Art

[0002] Chinese patent CN115029137B discloses a highly sensitive multi-parameter temperature probe phosphor and its preparation method and application. The above patent specifically proposes a highly sensitive multi-parameter temperature probe phosphor with the general chemical formula of Ca2LaTaO6: xmol%Mn 2+ , ymol% Tb 3+ , where x is the doped manganese ion Mn 2+ The molar percentage is 0.005≤x≤0.1, where y is the doped terbium Tb 3+ The mole percentage is 0.01≤y≤0.3.

[0003] It also points out that the above-mentioned product can be used for temperature measurement, including the following method: irradiating the phosphor with ultraviolet light of a wavelength of 254 nanometers, the powder is excited to emit two fluorescence emission peaks at 544 nanometers and 685 nanometers respectively;

[0004] In the temperature range of 303K to 443K:

[0005] The intensity ratio of the fluorescence emission peaks at 544 nm and 685 nm is linearly related to temperature.

[0006] The half-peak width of the Mn emission peak is linearly related to temperature.

[0007] The peak energy of the Mn emission peak is linearly related to temperature.

[0008] Based on the above three linear relationships, by measuring any one or more of the following three parameters:

[0009] The ratio of the two fluorescence emission peak intensities, the half-maximum width of the Mn emission peak, and the peak energy of the Mn emission peak,

[0010] Substitute the measured parameter values ​​into the corresponding linear relationship to obtain the temperature of the environment in which the material is located.

[0011] However, the technical solution provided by the above patent does not provide specific equipment and testing methods for temperature measurement.

[0012] Summary of the Invention

[0013] In view of the deficiencies in the prior art, the present invention aims to provide an optical temperature measurement device and a temperature measurement method.

[0014] An optical temperature measurement device includes: a housing 1, an ultraviolet light emitting unit 2, a heat transfer unit 3, a fluorescent unit 4, a first grating 5, a second grating 6, a first condensing lens 7, a second condensing lens 8, a first optical probe 9, a second optical probe 10, an operation unit 11, and a light barrier 12;

[0015] The bottom of the shell is a concave lens, and a fluorescent part is provided at the focus of the concave lens. The surface of the fluorescent part facing the ultraviolet light emitting part is provided with fluorescent powder, and the chemical formula of the fluorescent powder is: Ca2LaTaO6: xmol%Mn 2+ , ymol% Tb 3+ , where x is the doped manganese ion Mn 2+ The molar percentage is 0.005≤x≤0.1, where y is the doped terbium Tb 3+ The mole percentage is 0.01≤y≤0.3.

[0016] The fluorescent portion is fixed to the housing via a heat transfer portion, wherein a portion of the heat transfer portion is located inside the housing and a portion is located outside the housing, and the portion inside the housing and the portion outside the housing are connected to each other;

[0017] The ultraviolet light emitting portion emits 254 nanometer ultraviolet light to illuminate the fluorescent portion, causing the fluorescent portion to emit fluorescence.

[0018] A first grating and a second grating are provided in the housing. After the fluorescence is reflected by the bottom of the housing, parallel light is formed and directed toward the first grating and the second grating. The first grating and the second grating are located on a cross section of the housing. The first grating and the second grating are in the form of sheets. The planes on which the first grating and the second grating are located are perpendicular to the parallel light. The first grating and the second grating transmit light of 544 nanometers and 685 nanometers, respectively.

[0019] The housing is further provided with a first condensing lens and a second condensing lens, the first condensing lens and the second condensing lens being respectively used to transmit the light of 544 nanometers and 685 nanometers respectively passing through the grating, so that the light of 544 nanometers and the light of 685 nanometers are focused on the first optical probe and the second optical probe respectively;

[0020] The first optical probe and the second optical probe are respectively located at the focal points of the first condensing lens and the second condensing lens;

[0021] A light-isolating plate is provided at the boundary between the first grating and the second grating, and the light-isolating plate, the first grating and the housing form a first cavity, and the first condensing lens and the first optical probe are located in the first cavity;

[0022] The light isolation sheet, the second grating and the housing form a second cavity, and the second condensing lens and the second optical probe are located in the second cavity;

[0023] The first optical probe and the second photoelectric probe respectively collect light intensity signals of 544 nanometers and 685 nanometers.

[0024] The first optical probe and the second photoelectric probe are electrically connected to the computing unit.

[0025] Preferably, the interior of the shell is a mirror surface.

[0026] Preferably, both sides of the light-isolating sheet are mirror surfaces.

[0027] Preferably, the first grating and the second grating have the same area and are half of the cross section of the shell.

[0028] Preferably, the first cavity and the second cavity have the same volume and shape.

[0029] The present invention also provides a measurement method of an optical temperature measuring device, comprising the following steps:

[0030] contacting the heat transfer portion with an object to be measured;

[0031] After the temperature of the object to be measured is transferred to the fluorescent part, the ultraviolet light emitting part is turned on to emit 254 nanometer ultraviolet light to illuminate the fluorescent part, causing the fluorescent part to emit fluorescence;

[0032] After the fluorescence is reflected by the bottom of the housing, it forms parallel light and is directed toward the first grating and the second grating;

[0033] The first grating and the second grating are used to transmit light of 544 nm and 685 nm respectively.

[0034] The first condensing lens and the second condensing lens are used to make the 544 nm light and the 685 nm light pass through the first condensing lens and the second condensing lens respectively and then focus on the first optical probe and the second optical probe respectively.

[0035] The first cavity is used to prevent light of other wavelengths from interfering with the 544 nm light collected by the probe;

[0036] The second cavity is used to prevent light of other wavelengths from interfering with the 685 nm light collected by the probe;

[0037] using the first optical probe and the second photoelectric probe to respectively collect light intensity signals of 544 nanometers and 685 nanometers, and transmit them to the computing unit through the electrical connection;

[0038] The computing unit is used to perform light intensity and temperature conversion calculation and output a temperature result.

[0039] The beneficial effects of the fluorescent powder of the present invention in temperature detection are as follows:

[0040] When the phosphor is irradiated with short-wave ultraviolet light at a wavelength of 254 nanometers, the powder is excited to emit two fluorescence emission peaks at 544 nanometers and 685 nanometers, respectively. Within the temperature range of 30°C to 170°C, these two spectrally distinguishable fluorescence emission peaks exhibit distinctly different variations with temperature, and the ratio of their intensities can be measured to calibrate the temperature of the material's environment. The present invention utilizes the aforementioned phosphor to design a temperature measurement device and method. The device of the present invention has a simple structure and low cost. The structure of the heat transfer portion separates the precise temperature measurement device from the object to be measured, which has a wide range of temperature variations, thereby reducing the impact of the external environment on the temperature measurement device. The present invention utilizes a grating and a cavity to filter the emitted light into two groups, reducing interference through the cavity. In addition, the amount of phosphor used in the present invention is small. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the specific embodiments or the description of the prior art. Hereinafter, some specific embodiments of the present invention will be described in detail in an illustrative and non-limiting manner with reference to the drawings. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0042] FIG1 is a side view of a schematic diagram of the interior of the housing of the device of the present invention, wherein the reference numerals in the figure are as follows: housing 1, ultraviolet light emitting unit 2, heat transfer unit 3, fluorescent unit 4, first grating 5, first focusing lens 7, first optical probe 9, second optical probe 10, computing unit 11, light barrier 12;

[0043] Figure 2 is a top view of the overall structure of the device of the present invention, including a schematic diagram of the internal structure of the shell and the operation unit 11; the markings in the figure are as follows: shell 1, ultraviolet light emitting part 2, fluorescent part 4, first grating 5, second grating 6, first focusing lens 7, second focusing lens 8, first optical probe 9, second optical probe 10, operation unit 11, and light isolation sheet 12. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0045] The device of this embodiment includes: a housing 1, an ultraviolet light emitting unit 2, a heat transfer unit 3, a fluorescent unit 4, a first grating 5, a second grating 6, a first condensing lens 7, a second condensing lens 8, a first optical probe 9, a second optical probe 10, an operation unit 11, and a light barrier 12;

[0046] The housing includes a bottom and sidewalls, the bottom of which is a concave lens and the sidewalls are cylindrical. The interior of the housing is a mirrored surface to prevent external incident light from interfering with the optical signal within the housing and to reduce the absorption of fluorescence. A fluorescent portion is provided at the focal point of the bottom of the housing (as shown on the right side of the housing in FIG1 ). Phosphor powder is evenly fixed to the surface of the fluorescent portion facing the ultraviolet light-emitting portion. The volume of the fluorescent portion is much smaller than that of the bottom of the housing, making the fluorescent portion approximately point-shaped relative to the bottom of the housing.

[0047] The chemical formula of the phosphor is: Ca2LaTaO6: xmol%Mn 2+ , ymol% Tb 3+ , where x is the doped manganese ion Mn 2+ The molar percentage is 0.005≤x≤0.1, where y is the doped terbium Tb 3+ The mole percentage is 0.01≤y≤0.3.

[0048] The fluorescent part is fixed to the shell through the heat transfer part. A part of the heat transfer part is located inside the shell and is used to support the fluorescent part to be maintained at the focal point of the bottom of the shell. The heat transfer part is made of metal material with good thermal conductivity. The other part of the heat transfer part is located outside the shell and is used to better contact the object to be measured. The part inside the shell of the heat transfer part is connected to the part outside the shell, and the part outside the shell contacts the object to be measured. The temperature of the object to be measured is transferred to the fluorescent part through the heat transfer part. The ultraviolet light emitting part emits 254 nanometer ultraviolet light to irradiate the fluorescent part, causing the fluorescent part to emit fluorescence. The fluorescent part is at the focal point at the bottom of the shell. At a certain point, the fluorescence is reflected by the bottom of the shell to form parallel light, which is emitted to the first grating and the second grating. The first grating and the second grating are located on the cross section of the shell. The first grating and the second grating are in the form of sheets. The planes on which the first grating and the second grating are located are perpendicular to the parallel light. The first grating and the second grating have the same area and are half of the cross section on the shell wall. The first grating and the second grating allow 544 nanometers and 685 nanometers of light to pass through, respectively. The light passes through the first condensing lens and the second condensing lens, respectively, so that the light of 544 nanometers and 685 nanometers is focused on the first light probe and the second light probe, respectively.

[0049] A light-isolating plate is provided at the boundary between the first grating and the second grating, and both surfaces of the light-isolating plate are mirrored. The light-isolating plate, the first grating, and the housing form a first cavity, so that the first condensing lens and the first optical probe are located in the first cavity to prevent other light from interfering with the 544 nm light collected by the probe.

[0050] The light isolation sheet, the second grating and the housing form a second cavity, so that the second condensing lens and the second optical probe are located in the second cavity to prevent other light from interfering with the 685 nm light collected by the probe;

[0051] The first cavity and the second cavity have the same volume and shape;

[0052] The light intensity signals of the first optical probe and the second photoelectric probe at 544 nm and 685 nm respectively are transmitted to the computing unit 11 for performing light intensity and temperature conversion operation and outputting a temperature result.

[0053] Embodiment of the temperature measuring method of the present invention:

[0054] Perform calibration first: The calibration process is as follows:

[0055] Obtain a standard object with a known temperature, and use the heat transfer portion to contact the standard object;

[0056] After the temperature of the standard object is transferred to the fluorescent portion, the ultraviolet light emitting portion is turned on to emit 254 nanometer ultraviolet light to illuminate the fluorescent portion, causing the fluorescent portion to emit fluorescence;

[0057] After the fluorescence is reflected by the bottom of the housing, it forms parallel light and is directed toward the first grating and the second grating;

[0058] The first grating and the second grating are used to transmit light of 544 nm and 685 nm respectively.

[0059] The first condensing lens and the second condensing lens are used to make the 544 nm light and the 685 nm light pass through the first condensing lens and the second condensing lens respectively and then focus on the first optical probe and the second optical probe respectively.

[0060] The first cavity is used to prevent light of other wavelengths from interfering with the 544 nm light collected by the probe;

[0061] The second cavity is used to prevent light of other wavelengths from interfering with the 685 nm light collected by the probe;

[0062] using the first optical probe and the second photoelectric probe to respectively collect light intensity signals of 544 nanometers and 685 nanometers, and transmit them to the computing unit through the electrical connection;

[0063] The computing unit is used to output the light intensities of the 544-nanometer and 685-nanometer lights.

[0064] The above calibration process is repeated several times, and the relationship between temperature and light intensity is obtained using the light intensity and the temperature.

[0065] The temperature is measured using the relationship between temperature and light intensity:

[0066] Obtaining an object to be measured, and contacting the object to be measured with the heat transfer portion;

[0067] After the temperature of the object to be measured is transferred to the fluorescent part, the ultraviolet light emitting part is turned on to emit 254 nanometer ultraviolet light to illuminate the fluorescent part, causing the fluorescent part to emit fluorescence;

[0068] After the fluorescence is reflected by the bottom of the housing, it forms parallel light and is directed toward the first grating and the second grating;

[0069] The first grating and the second grating are used to transmit light of 544 nm and 685 nm respectively.

[0070] The first condensing lens and the second condensing lens are used to make the 544 nm light and the 685 nm light pass through the first condensing lens and the second condensing lens respectively and then focus on the first optical probe and the second optical probe respectively.

[0071] The first cavity is used to prevent light of other wavelengths from interfering with the 544 nm light collected by the probe;

[0072] The second cavity is used to prevent light of other wavelengths from interfering with the 685 nm light collected by the probe;

[0073] using the first optical probe and the second photoelectric probe to respectively collect light intensity signals of 544 nanometers and 685 nanometers, and transmit them to the computing unit through the electrical connection;

[0074] The computing unit is used to perform light intensity and temperature conversion calculation and output a temperature result.

[0075] The above description is only part of the specific implementation methods of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any person familiar with the art within the technical scope disclosed in the present invention should be covered by the protection scope of the present invention.

Claims

1. An optical temperature measuring device, characterized in that: include: Shell, ultraviolet light emitting part, heat transfer part, fluorescent part, first grating, second grating, first condensing lens, second condensing lens, first optical probe, second optical probe, computing unit, light isolation sheet; The bottom of the shell is a concave lens, and a fluorescent part is arranged at the focus of the concave lens. A fluorescent powder is arranged on the surface of the fluorescent part facing the ultraviolet light emitting part. The chemical formula of the fluorescent powder is: Ca2LaTaO6: xmol%Mn 2+ , ymol% Tb 3+ , where x is the doped manganese ion Mn 2+ The molar percentage is 0.005≤x≤0.1, where y is the doped terbium Tb 3+ The mole percentage of is 0.01≤y≤0.3; The fluorescent part is fixed to the shell through the heat transfer part, a part of the heat transfer part is located inside the shell, and a part of the heat transfer part is located outside the shell, and the part inside the shell and the part outside the shell are connected to each other; The ultraviolet light emitting part emits 254 nanometer ultraviolet light to illuminate the fluorescent part, so that the fluorescent part emits fluorescence. The housing is provided with a first grating and a second grating. After the fluorescence is reflected by the bottom of the housing, parallel light is formed and directed toward the first grating and the second grating. The first grating and the second grating are located on a cross section of the housing. The first grating and the second grating are in a sheet shape. The plane where the first grating and the second grating are located is perpendicular to the parallel light. The first grating and the second grating transmit light of 544 nanometers and 685 nanometers respectively. The housing is further provided with a first condenser lens and a second condenser lens, the first condenser lens and the second condenser lens are respectively used to transmit the light of 544 nanometers and 685 nanometers respectively passing through the grating, so that the light of 544 nanometers and the light of 685 nanometers are focused on the first optical probe and the second optical probe respectively; The first optical probe and the second optical probe are respectively located at the focal points of the first condensing lens and the second condensing lens; A light-isolating sheet is provided at the boundary between the first grating and the second grating, the light-isolating sheet, the first grating and the housing form a first cavity, and the first condensing lens and the first optical probe are located in the first cavity; The light isolation sheet, the second grating and the housing form a second cavity, and the second condenser lens and the second optical probe are located in the second cavity; The first optical probe and the second photoelectric probe collect light intensity signals of 544 nanometers and 685 nanometers respectively. The first optical probe and the second photoelectric probe are connected to the computing unit through an electrical connection.

2. An optical temperature measuring device as claimed in claim 1, characterized in that: The interior of the shell is a mirror surface.

3. An optical temperature measuring device as claimed in claim 2, characterized in that: Both sides of the light isolation sheet are mirror surfaces.

4. An optical temperature measuring device as claimed in claim 3, characterized in that: The first grating and the second grating have the same area and are half of the cross section of the shell.

5. An optical temperature measuring device as claimed in claim 4, characterized in that: The first cavity and the second cavity have the same volume and shape.

6. A temperature measurement method using an optical temperature measurement device as claimed in claim 5, characterized in that: The following steps are involved: Using the heat transfer portion to contact the object to be measured; After the temperature of the object to be measured is transmitted to the fluorescent part, the ultraviolet light emitting part is turned on to emit 254 nanometer ultraviolet light to irradiate the fluorescent part, so that the fluorescent part emits fluorescence; After the fluorescence is reflected by the bottom of the housing, parallel light is formed and directed toward the first grating and the second grating; The first grating and the second grating are used to transmit light of 544 nanometers and light of 685 nanometers, respectively. The first condenser lens and the second condenser lens are used to make the light of 544 nanometers and the light of 685 nanometers pass through the first condenser lens and the second condenser lens respectively, and then focus on the first light probe and the second light probe respectively. The first cavity is used to prevent light of other wavelengths from interfering with the 544-nanometer light collected by the probe; The second cavity is used to prevent light of other wavelengths from interfering with the 685-nanometer light collected by the probe; Using the first optical probe and the second photoelectric probe to respectively collect light intensity signals of 544 nanometers and 685 nanometers, and transmit them to the computing unit through the electrical connection; The computing unit is used to perform light intensity and temperature conversion operations and output a temperature result.

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