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Device and method for synchronously measuring concentration, thickness and temperature of liquid film

A synchronous measurement and liquid film technology, applied in measurement devices, instruments, etc., can solve problems such as inability to measure at the same time, difficulty in model establishment and solution, and achieve the effect of increased strength and high-precision measurement

Active Publication Date: 2015-05-20
UNIV OF SHANGHAI FOR SCI & TECH
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Problems solved by technology

[0003] The thickness of the solution liquid film, temperature and the concentration of components inside the liquid film are closely related. In the study of liquid film, these parameters are often coupled with each other, which brings difficulties to model establishment and solution.
The traditional measurement method can only realize the measurement of a single parameter in the concentration, thickness and temperature of the liquid film, and cannot measure these three important indicators at the same time

Method used

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  • Device and method for synchronously measuring concentration, thickness and temperature of liquid film

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Embodiment 1

[0018] figure 1 It is the device for synchronously measuring liquid film concentration, thickness and temperature of the embodiment.

[0019] Such as figure 1 As shown, the device 10 for synchronously measuring liquid film concentration, thickness and temperature includes a laser light source 11, a laser light source 12, a laser light source 13, a wavelength division multiplexer 14, a first collimator 15, a liquid film carrier 16, a second collimator Straightener 17, wave splitter 18, spectrum acquisition component 19, spectrum acquisition component 20, spectrum acquisition component 21 and computer 22.

[0020] In this embodiment, the laser light sources 11, 12 and 13 are all semiconductor lasers. The wavelength division multiplexer 14 is connected to the semiconductor laser 11 , the semiconductor laser 12 and the semiconductor laser 13 respectively. The first collimator 15 is connected to the wavelength division multiplexer 14 . The liquid film carrier 16 is arranged dir...

Embodiment 2

[0023] The method of simultaneous measurement of liquid film concentration, thickness and temperature is as follows:

[0024] Step 1, take pure water and urea solution liquid films with mass concentrations of 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, and 50% respectively, and use absorption spectroscopy to measure The device measures the pure water and the above-mentioned urea solution liquid film at a wave number of 6000-8000cm -1 , Absorption coefficient at 20°C, 30°C, 40°C, 50°C.

[0025] Step 2, plot the absorption coefficients of pure water and all urea liquid films at different temperatures against the wave number to obtain the absorption coefficient-wave number curve, compare the absorption coefficient values ​​of all urea liquid films at different wave numbers, and select the wave number ν 1 and ν 2 , so that the rate of change of the absorption coefficient of all urea liquid films at different concentrations and different temperatures to the concentration is zero;...

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Abstract

The invention provides a device for synchronously measuring concentration, thickness and temperature of a liquid film. The device is characterized by comprising three laser light sources, a wavelength division multiplexer, a first collimator, a liquid film carrier, a second collimator, a wave separator, three spectrum collection parts and a computer, wherein the three laser light sources transmits laser beams of different wavelengths; the wavelength division multiplexer is connected with the three laser light sources, and the three laser beams are coupled into one beam; the first collimator is connected with the wavelength division multiplexer and used for focusing the laser beam; the liquid film carrier is arranged right below the first collimator; the second collimator is arranged right below the liquid film carrier and used for collecting laser beams penetrating through the liquid film carrier and focusing the laser beam; the wave separator is connected with the second collimator and separating the laser beam into three laser beams in different wavelengths; the three spectrum collection parts are respectively connected with the wave separator and used for receiving and measuring the intensity of each laser beam separated by the wave separator; the computer is respectively connected with the three spectrum collection parts and used for processing the intensity of the laser beams measured by the three spectrum collection parts and calculating the concentration, thickness and temperature value of the to-be-detected liquid film.

Description

technical field [0001] The invention relates to a measuring device and a measuring method, in particular to a measuring device and a measuring method for online synchronously measuring the concentration, thickness and temperature of a liquid film to be measured based on the Beer-Lambert law. Background technique [0002] In various industrial processes, the phenomenon that liquid droplets hit solid surfaces to form liquid films widely exists, such as the formation of urea solution liquid films on automobile exhaust pipes in selective catalytic reduction (SCR) systems. Quantitative analysis of liquid film can not only better understand the essence of the extremely complex physical process of liquid film formation and evaporation, but also has very important significance for optimizing various industrial processes involved in liquid film. [0003] The liquid film thickness, temperature and the concentration of components inside the liquid film are closely related. In the study...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D21/02
Inventor 杨荟楠石建伟郭晓龙蔡小舒
Owner UNIV OF SHANGHAI FOR SCI & TECH
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