CN114485948A - Non-contact liquid evaporation temperature measuring device and method - Google Patents
Non-contact liquid evaporation temperature measuring device and method Download PDFInfo
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- CN114485948A CN114485948A CN202210249766.8A CN202210249766A CN114485948A CN 114485948 A CN114485948 A CN 114485948A CN 202210249766 A CN202210249766 A CN 202210249766A CN 114485948 A CN114485948 A CN 114485948A
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- 238000010438 heat treatment Methods 0.000 claims abstract description 90
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/10—Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors
- G01J5/12—Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors using thermoelectric elements, e.g. thermocouples
- G01J5/14—Electrical features thereof
- G01J5/16—Arrangements with respect to the cold junction; Compensating influence of ambient temperature or other variables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/296—Acoustic waves
- G01F23/2961—Acoustic waves for discrete levels
Abstract
The invention relates to a non-contact liquid evaporation temperature measuring device, which comprises a thermopile temperature measuring sensor, a control panel, a heating panel and an evaporation container, and is characterized by further comprising an ultrasonic distance meter and a microprocessor, wherein the ultrasonic distance meter is arranged for measuring the liquid level height of evaporated liquid, the microprocessor is arranged for correcting the liquid sample evaporation temperature measured by the thermopile temperature measuring sensor according to the liquid level height measured by the ultrasonic distance meter, and the thermopile temperature measuring sensor, the control panel, the heating panel and the ultrasonic distance meter are mutually associated in an electric connection mode.
Description
Technical Field
The invention relates to the field of laboratory devices, in particular to a device and a method for measuring liquid evaporation temperature in a non-contact manner during evaporation, and particularly discloses a device and a method for measuring non-contact liquid evaporation temperature.
Background
In the field of environmental monitoring, especially radiation environmental monitoring, in order to reduce the volume of a liquid sample, the sample is usually subjected to a thermal evaporation concentration process. In order to avoid sample loss, the sample needs to be prevented from bumping and sputtering during the treatment process, so that the temperature is prevented from being too high, and for some analysis items, such as iodine analysis and measurement, the heating evaporation concentration at the temperature of more than 80 ℃ is easy to cause the volatilization of iodine, so that the evaporation temperature is controlled in a required temperature range when the samples are treated.
In order to ensure the homogeneity of the liquid sample and to reduce the adsorption to the evaporation vessel, the sample must first be acidified before concentration, so that the temperature measurement device is generally required to be contactless, which has the further advantage of avoiding cross contamination of the sample.
The liquid sample of heating evaporation carries out temperature measurement, on the one hand needs real-time measurement feedback to guarantee the timely control of temperature, on the other hand, to the temperature measurement of this type of sample, need consider the influence of vapour and liquid level change.
Among the publicly available devices or techniques, there is a method of controlling the evaporation temperature by controlling the temperature of the heating panel, which has a slow response to temperature changes and also has difficulty in accurately controlling the evaporation temperature because the solution temperature is not directly measured; the temperature measuring device is integrated with the evaporation container, however, because of the limitation of the acidified liquid sample, the laboratory preferably uses glassware for evaporation, and because of the limitation of the material of the evaporation container, the integrated device is difficult to prepare, thereby limiting the long-term treatment of the acidified sample.
For example, the published chinese patent application CN103674312A discloses a method and apparatus for non-contact temperature measurement, which is directed to temperature measurement of hot rollers, and is not a non-interference item for laboratory evaporation process, and therefore is not suitable for precise temperature solution evaporation test.
Chinese patent CN215178181U discloses a device for non-contact measurement of seawater surface temperature, which mainly uses a reflector structure, a focusing mirror, a thermopile sensor, a low-noise preamplifier circuit board, a signal processing circuit board, a waterproof connector and an upper computer to realize seawater surface temperature measurement, but it does not correct the temperature and is difficult to ensure the accuracy of the temperature.
US patent invention US20090304042a1 discloses a non-contact thermometer that relies on emitting light waves of different colors and comparing temperature difference thresholds to detect a target temperature, which is also not calibrated for the test temperature.
However, none of the above prior art techniques provides precise control of the evaporation temperature in laboratory situations.
The inventor discovers the following technical problems in the prior art in the evaporation experiment process, after the used thermopile temperature measuring sensor is acted by infrared rays radiated by a measured object, the sensor generates an electric signal, the higher the temperature of the measured object is, the stronger the generated electric signal is, and meanwhile, the output signal is also influenced by the ambient temperature, and the influence can be solved through the built-in temperature measurement compensation inside the sensor. The thermopile temperature measuring sensor is non-contact measurement, a point on an object is not measured, but a region is called as a light spot, and for fixed optical resolution, theoretically, the closer the thermopile temperature measuring sensor is to the measured object, the smaller the area of the light spot region is.
Typically, the evaporation vessel is selected as a beaker, the walls of which are in direct contact with the liquid sample and with ambient air, while the bottom of the beaker is in direct contact with the heating panel, so that the spot area measured on the walls of the beaker is affected by the temperature of the liquid sample, the temperature of the heating panel and the ambient temperature. In addition, the important aspect to be considered is that when the liquid sample is advanced along with the evaporation process, the liquid level 7 slowly passes through the measuring light spot of the thermopile temperature measuring sensor and is finally gradually lower than the light spot, and based on the problems, the thermopile temperature measuring sensor is directly adopted to measure the liquid evaporation temperature, so that the evaporation temperature cannot be accurately reflected.
Based on the above problems, the inventors propose the following solution.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a non-contact liquid evaporation temperature measuring device.
The non-contact liquid evaporation temperature measuring device comprises a thermopile temperature measuring sensor, a control panel, a heating panel and an evaporation container, and is characterized by further comprising an ultrasonic distance meter and a microprocessor, wherein the ultrasonic distance meter is arranged to be used for measuring the liquid level height of evaporated liquid, the microprocessor is arranged to be used for correcting the liquid sample evaporation temperature measured by the thermopile temperature measuring sensor according to the liquid level height measured by the ultrasonic distance meter, and the thermopile temperature measuring sensor, the control panel, the heating panel and the ultrasonic distance meter are mutually associated in an electric connection mode.
Further, the thermopile temperature detecting sensor is disposed outside the evaporation vessel, the thermopile temperature detecting sensor may be disposed in one or more, preferably, when the thermopile temperature detecting sensor is disposed in plural, the plural thermopile temperature detecting sensors are disposed to have the same horizontal position in the height direction of the evaporation vessel;
further, the evaporation container is a laboratory container including but not limited to a beaker, a test tube, a conical flask, a flask, an evaporation dish, etc., and preferably the evaporation container is a beaker made of glass, ceramic, metal, etc.
Further, the thermopile temperature measuring sensor is arranged on the outer side face of the evaporation container, when the evaporation container is selected as a beaker, the thermopile temperature measuring sensor is arranged on the outer side of the wall of the beaker, a first distance is kept between the thermopile temperature measuring sensor and the wall of the beaker, the first distance is determined by the optical resolution of the thermopile temperature measuring sensor, the distance from the thermopile temperature measuring sensor to the heating panel is a second distance, the second distance is determined based on the influence of the heating panel on the thermopile temperature measuring sensor, and preferably the second distance ensures that the heating panel does not influence the work of the thermopile temperature measuring sensor.
Further, the heating panel is non-open fire heating, optionally electromagnetic heating or electric heating wire heating or a dividing wall type heater or a heat exchanger.
Further, the ultrasonic distance meter is installed above the evaporation liquid level, the liquid level height of the liquid to be evaporated is measured, the ultrasonic distance meter feeds back measurement data to the microprocessor, and the installation height of the ultrasonic distance meter ensures that the liquid level is outside an ultrasonic measurement blind area.
Further, the heating panel is arranged below the evaporation container and is close to the evaporation container, the heating panel is used for providing heat required by evaporation of the solution, and a panel temperature measuring device is arranged in the heating panel and is used for measuring the real-time temperature of the heating panel.
Furthermore, the microprocessor receives the temperature information of the side wall of the evaporation container obtained by the thermopile temperature measuring sensor, receives the liquid level height information of the evaporation liquid returned by the ultrasonic range finder and the temperature information of the heating panel returned by the temperature measuring device arranged in the heating panel, processes and corrects the data according to the received temperature information of the side wall of the evaporation container, the liquid level height information and the temperature information of the heating panel, and displays the processing and correcting result on the control panel.
Further, the steam generated by evaporation may interfere with the measurement of the thermopile temperature sensor, and the smoke generated by evaporation is acidic, so that the corrosion resistance of the thermopile temperature sensor is more required, and therefore, the thermopile temperature sensor is not arranged above the evaporation liquid level.
In another aspect of the present invention, a non-contact liquid evaporation temperature measurement method based on a non-contact liquid evaporation temperature measurement device is also claimed, wherein: the method comprises the following steps:
the thermopile temperature measuring sensor acquires infrared rays radiated by a measured object to generate an electric signal;
the ultrasonic distance meter acquires the height data of the liquid level of the liquid to be measured;
the heating panel temperature measuring device acquires temperature data of the heating panel;
the thermopile temperature measuring sensor and the heating panel temperature measuring device feed temperature data back to the microprocessor, and the ultrasonic range finder feeds liquid level height data back to the microprocessor;
the microprocessor processes and corrects the temperature data fed back by the thermopile temperature measuring sensor, the temperature data of the heating panel temperature measuring device and the liquid level height data fed back by the ultrasonic range finder;
the processed and corrected liquid evaporation temperature is displayed on the control panel.
Further, the processing and correcting comprises the following steps:
s1: acquiring the relative positions of a thermopile temperature sensor, an evaporation container and a heating panel, acquiring light spot height data of the thermopile temperature sensor, acquiring the reflectivity of the thermopile temperature sensor, acquiring liquid level height data h, performing data correction segmentation according to the liquid level height data, and defining the height of the lowest point of a light spot in the vertical direction of the light spot height data as h00The highest point of the light spot is h01；
S2: defining the temperature x fed back to the processor by the thermopile temperature sensor1Heating panel temperature x2The liquid level height h of the liquid sample and the actual temperature Y of the liquid sample;
when h is greater than h01Acquiring the temperature x fed back to the processor by the thermopile temperature sensor1Obtaining the temperature x of the heating panel2Then Y ═ f (x)1)f(x2) Defining f (x) for a given material and thickness of the evaporation vessel1)＝ax1At x1Obtaining that the heating panel is in a standby state at the moment, testing and calculating to obtain more than 30 groups of x under the condition that Y is within a certain range and is accurately known, for example, Y is lower than 100 ℃ and is accurately known, and evaporation containers with the same material and the same thickness are obtained1And Y/x1Value, polynomial fitting Y/x1Obtaining a value a; for evaporation containers with the same material and different thicknesses, the compensation coefficient b is increased, and in this case, f (x1) is ax1+ b, after obtaining the above a value, testing the actual temperature and x of the evaporation container with the same material and different thickness1Linear fitting to obtain b;
f(x2) And x1Whether the heating panel is operated at the moment of measurement, and f (x) when the heating panel is in a standby state2) 1 is ═ 1; when the heating panel works, in the process of acquiring the fitting data of the data a and b, a certain x2Within the range (200 ℃ C. and 400 ℃ C.), and simultaneously acquiring x when the heating panel works1’Polynomial fitting of x1/x1’Is combined to obtain f (x)2)；
When h is less than h01And h is greater than h00Then Y ═ f (x)1)f(x2)f(h)；f(x1) And f (x)2) As mentioned above, the liquid level is measured from h01To h00At least 7 points f (h) calculated values, the f (h) expression being obtained by polynomial fitting of two variables;
when h is less than h00Then Y ═ k ═ f (x)1)f(x2) And f (h), wherein k is an empirical correction factor, the parameter is obtained by testing the heating panel in a low-temperature and constant-temperature state, more than 3 corresponding k values of the temperature of the heating panel can be tested, and k of other temperature values in the temperature range can be obtained by an interpolation method.
The application also claims an application based on a non-contact liquid evaporation temperature measuring device, in particular to the measurement of the temperature of liquid with liquid level change in the process of evaporating liquid.
The invention has the beneficial effects that:
1) the liquid sample is not contacted with any other parts except the evaporation container, the application range is wide, the requirement on the liquid sample is not high, and the liquid sample can be corrosive liquid such as acid, alkaline and the like, and meanwhile, the problem of cross contamination is avoided.
2) And the temperature correction calculation method is characterized in that the microprocessor carries out different correction methods according to the evaporation liquid level height, so that the finally displayed evaporation temperature result of the liquid sample is ensured to be more accurate.
3) The device has the advantages of few components, simple structure, low maintenance cost, low requirement on technical personnel and easy installation on required equipment according to requirements.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be 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 that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of a non-contact liquid evaporation temperature measurement device of the present invention;
FIG. 2 is a schematic diagram showing the relationship between the liquid level and the position of a light spot according to the present invention;
in the figure: 1. a thermopile temperature sensor; 2. an ultrasonic range finder; 3. a processor; 4. a control panel; 5. a heating panel; 6. an evaporation vessel; 7. light spots; 8. the liquid level.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the present application, terms indicating positional relationships and connection relationships, etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the invention and its embodiments and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail with reference to the accompanying drawings 1-2, in conjunction with the embodiments.
Examples
A non-contact liquid evaporation temperature measuring device comprises a thermopile temperature measuring sensor 1, a control panel 4, a heating panel 5, an evaporation container 6, an ultrasonic range finder 2 and a processor 3, wherein the ultrasonic range finder 2 is arranged to be used for measuring the liquid level height of evaporated liquid, the processor 3 is arranged to be used for correcting the evaporation temperature of a liquid sample measured by the thermopile temperature measuring sensor 1 according to the liquid level height measured by the ultrasonic range finder 2, and the thermopile temperature measuring sensor 1, the control panel 4, the heating panel 5 and the ultrasonic range finder 2 are mutually associated in an electric connection mode.
The evaporation container 6 is closely adjacent to the upper part of the heating panel 5, the heating panel 5 is electrically connected with the processor 3, the processor 3 controls the control panel 4, the ultrasonic range finder 2 and the thermopile temperature measuring sensor 1,
the thermopile temperature measuring sensor 1 is arranged outside the evaporation container beaker 6, and one thermopile temperature measuring sensor 1 is arranged; the evaporation vessel 6 is a laboratory vessel beaker, which is made of heat-resistant glass in this embodiment and has a side wall thickness of 0.34 cm.
The thermopile temperature sensor 1 is arranged on the outer side of the wall, the thermopile temperature sensor 1 and the wall of the evaporation container 6 keep a first distance, the first distance is 9cm in the embodiment, and the distance from the thermopile temperature sensor 1 to the heating panel 5 is 2.5 cm.
The heating panel 5 is not heated by open fire, and is heated by an electric heating wire.
The ultrasonic distance meter 2 is arranged above the evaporation liquid level and used for measuring the liquid level height of the liquid to be evaporated, the ultrasonic distance meter 2 feeds back measurement data to the microprocessor 3, and the distance from the ultrasonic distance meter 2 to the liquid level is 5-40 cm.
The microprocessor 3 receives temperature information of the side wall of the liquid evaporation container obtained by the thermopile temperature measuring sensor 1, the microprocessor 3 receives liquid level height information of the evaporation liquid returned by the ultrasonic range finder 2 and temperature information of the heating panel 5 returned by a built-in temperature measuring device in the heating panel 5, and the microprocessor 3 processes and corrects data according to the received temperature information of the side wall of the liquid evaporation container, the liquid level height information and the temperature information of the heating panel and displays the processing and correcting result on the control panel 4.
The type of the thermopile temperature measuring sensor used in the embodiment is ABSD10A 4; the model of the ultrasonic range finder is LGCB 1000; the processor can be a single chip microcomputer or other microprocessor with stronger computing capability.
The non-contact liquid evaporation temperature measuring method based on the device comprises the following steps:
the thermopile temperature measuring sensor 1 acquires infrared rays radiated by the measured evaporation container 6 and generates an electric signal;
the ultrasonic distance meter 2 acquires liquid level height data h of the liquid to be measured;
the temperature measuring device of the heating panel 5 acquires temperature data x of the heating panel2；
The temperature measuring devices of the thermopile temperature measuring sensor 1 and the heating panel 5 feed temperature data back to the microprocessor 3, and the ultrasonic range finder 2 feeds liquid level height data back to the microprocessor 3;
the microprocessor 3 feeds back temperature data x according to the thermopile temperature measuring sensor 11Temperature data x of a temperature measuring device of a heating panel2Processing the liquid level height data h fed back by the ultrasonic distance measuring instrument and correcting the temperature data;
the processed and corrected liquid evaporation temperature is displayed on the control panel 4.
Further, the processing and correcting comprises the following steps:
s1: acquiring the relative positions of the thermopile temperature sensor 1, the evaporation container 6 and the heating panel 5, acquiring the light spot height data of the thermopile temperature sensor 1, acquiring the reflectivity of the thermopile temperature sensor 1, wherein the reflectivity of the thermopile temperature sensor 1 is 0.95 in the embodiment, or selecting the thermopile temperature sensor with adjustable reflectivity, acquiring the liquid level height data h, performing correction data segmentation according to the liquid level height data h, and defining the height of the lowest point of the light spot in the vertical direction of the light spot height data as h00The highest point of the light spot is h01；
S2: defining the temperature x fed back to the processor by the thermopile temperature sensor1Heating panel temperature x2The liquid level height h of the liquid sample and the actual temperature Y of the liquid sample;
when h is greater than h01Acquiring the temperature x fed back to the processor by the thermopile temperature sensor1Obtaining the temperature x of the heating panel2Then Y ═ f (x)1)f(x2)；
At this time f (x)1) Comprises the following steps: f (x)1)＝1.169x1The specific calculation method is obtained according to the calculation method in the invention content;
when the heating panel is operated, f (x)2) 0.985 (heating panel temperature range 200 ℃.),
when the heating panel is in standby, f (x)2)＝1；
When h is less than h01And h is greater than h00Then Y ═ f (x)1)f(x2)f(h)；
At this time f (x)1) Comprises the following steps: f (x)1)＝1.169x1；
When the heating panel is operated, f (x)2) 0.985 (heating panel temperature range 200 ℃.),
when the heating panel is in standby, f (x)2)＝1；
Where f (h) is: f (h) 0.4 ℃/mm (spot diameter 10 mm);
when h is less than h00Then Y ═ k ═ f (x)1)f(x2) f (h), wherein k is an empirical correction factor.
At this time f (x)1) Comprises the following steps: f (x)1)＝1.169x1，
At this time f (x)2) Comprises the following steps: when the heating panel is operated, f (x)2) 0.985 (heating panel temperature range 200 ℃.),
when the heating panel is not in operation, f (x)2)＝1；
Where f (h) is: f (h) 0.4 ℃/mm (spot diameter 10 mm);
the value range of K is as follows: 1.15 (heating panel constant temperature 200 ℃).
Compared with the temperature value measured by direct contact, the non-contact liquid evaporation temperature obtained by the method can be controlled to be below 4 percent, and the temperature measuring means can avoid the direct contact of the thermometer and the evaporated liquid, avoid the pollution to the evaporated liquid and avoid the damage of corrosive or acidic liquid to the thermometer.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The non-contact liquid evaporation temperature measuring device is characterized by comprising a thermopile temperature measuring sensor, a control panel, a heating panel and an evaporation container, and further comprising an ultrasonic range finder and a microprocessor, wherein the ultrasonic range finder is arranged to be used for measuring the liquid level height of evaporated liquid, the microprocessor is arranged to be used for correcting the liquid sample evaporation temperature measured by the thermopile temperature measuring sensor according to the liquid level height measured by the ultrasonic range finder, and the thermopile temperature measuring sensor, the control panel, the heating panel and the ultrasonic range finder are connected in an electric connection mode.
2. The non-contact liquid evaporation temperature measurement device of claim 1, wherein: the thermopile temperature measuring sensors are disposed outside the evaporation vessel, the thermopile temperature measuring sensors may be disposed in one or more number, and a plurality of the thermopile temperature measuring sensors are arranged to have the same horizontal position in the height direction of the evaporation vessel.
3. The non-contact liquid evaporation temperature measurement device of claim 1, wherein: the heating panel is heated by non-open fire and is any one of electromagnetic heating, electric heating wire heating or dividing wall type heater.
4. The non-contact liquid evaporation temperature measurement device of claim 1, wherein: the ultrasonic distance meter is arranged above the evaporation liquid level and used for measuring the liquid level height of the liquid to be evaporated, and the ultrasonic distance meter feeds back measurement data to the microprocessor.
5. The non-contact liquid evaporation temperature measurement device of claim 1, wherein: the heating panel is arranged below the evaporation container and is close to the evaporation container, the heating panel is used for providing heat required by solution evaporation, a panel temperature measuring device is arranged in the heating panel and is used for measuring the real-time temperature of the heating panel, and the panel temperature measuring device feeds back measured data to the microprocessor.
6. The non-contact liquid evaporation temperature measurement device of claim 1, wherein: the micro processor receives temperature information of the side wall of the liquid evaporation container obtained by the thermopile temperature measuring sensor, receives liquid level height information of the evaporation liquid returned by the ultrasonic range finder and temperature information of the heating panel returned by the temperature measuring device arranged in the heating panel, processes and corrects data according to the received temperature information of the side wall of the liquid evaporation container, the received liquid level height information and the received temperature information of the heating panel, and displays a processing and correcting result on the control panel.
7. A non-contact liquid evaporation temperature measurement method of a non-contact liquid evaporation temperature measurement apparatus according to any one of claims 1 to 6: the method is characterized in that: the method comprises the following steps:
the thermopile temperature measuring sensor acquires infrared rays radiated by a measured object to generate an electric signal;
the ultrasonic distance meter acquires the height data of the liquid level of the liquid to be measured;
the heating panel temperature measuring device acquires temperature data of the heating panel;
the thermopile temperature measuring sensor and the heating panel temperature measuring device feed temperature data back to the microprocessor, and the ultrasonic range finder feeds liquid level height data back to the microprocessor;
the microprocessor processes and corrects the temperature data fed back by the thermopile temperature measuring sensor, the temperature data of the heating panel temperature measuring device and the liquid level height data fed back by the ultrasonic range finder;
the processed and corrected liquid evaporation temperature is displayed on the control panel.
8. A non-contact liquid evaporation temperature measurement method according to claim 7: the method is characterized in that:
the processing and correcting comprises the following steps:
s1: acquiring the relative positions of a thermopile temperature sensor, an evaporation container and a heating panel, acquiring light spot height data of the thermopile temperature sensor, acquiring the reflectivity of the thermopile temperature sensor, acquiring liquid level height data h, performing data correction segmentation according to the liquid level height data, and defining the height of the lowest point of a light spot in the vertical direction of the light spot height data as h00The highest point height of the light spot is h01；
S2: defining the temperature x fed back to the processor by the thermopile temperature sensor1Heating panel temperature x2The liquid level height h of the liquid sample and the actual temperature Y of the liquid sample;
when h is greater than h01Acquiring the temperature x fed back to the processor by the thermopile temperature sensor1Obtaining the temperature x of the heating panel2Then Y ═ f (x)1)f(x2) Defining f (x) for a given material and thickness of the evaporation vessel1)＝ax1At x1The heating panel is in a standby state at the acquisition moment, Y is lower than 100 ℃ and is accurately known, and more than 30 groups of x are obtained by testing and calculating under the condition that the Y is accurately known and the thickness of the evaporation container is equal to that of the same material1And Y/x1Value, polynomial fitting Y/x1Obtaining a value a; for evaporation containers with the same material and different thicknesses, the compensation coefficient b is increased, and in this case, f (x1) is ax1+ b, after obtaining the above a value, testing the actual temperature and x of the evaporation container with the same material and different thickness1Linear fitting to obtain b;
f(x2) And x1Whether the heating panel is operated at the moment of measurement, and f (x) when the heating panel is in a standby state2) 1 is ═ 1; when the heating panel is in operation, x is obtained during the data a and b fitting data acquisition process2The range value is 200-400 ℃, and x of the heating panel during working is obtained simultaneously1’Polynomial fitting of x1/x1’Is combined to obtain f (x)2)；
When h is less than h01And h is greater than h00Then Y ═ f (x)1)f(x2)f(h)；f(x1) And f (x)2) Obtained as described above, by measuring the level of the liquid from h, with Y below 100 ℃ and precisely known01To h00At least 7 points f (h) calculated values, the f (h) expression being obtained by polynomial fitting of two variables;
when h is less than h00Then Y ═ k ═ f (x)1)f(x2) And f, wherein k is an empirical correction factor, the parameter is obtained by testing the heating panel in a low-temperature and constant-temperature state, more than 3 corresponding k values of the temperature of the heating panel are tested, and the k values of other temperature values in the temperature range are obtained by an interpolation method.
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