CN108254100B - Optical fiber sensing liquid refractive index and temperature simultaneous measurement system and measurement method - Google Patents
Optical fiber sensing liquid refractive index and temperature simultaneous measurement system and measurement method Download PDFInfo
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- 239000007788 liquid Substances 0.000 title claims abstract description 117
- 239000013307 optical fiber Substances 0.000 title claims abstract description 89
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- 238000002310 reflectometry Methods 0.000 claims description 8
- 239000012153 distilled water Substances 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
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- 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
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- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
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- G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
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Abstract
一种光纤传感液体折射率和温度同时测量系统及测量方法，属于光纤传感检测领域。它是为了解决液体折射率和温度同时远距离在线测量的问题。本发明所述的一种光纤传感液体折射率和温度同时测量系统及测量方法，系统包括：光源(1)，波分复用器(2)、光电探测器(3)、采集卡(4)、计算机(5)、光纤恒温槽(6)、传感光纤(7)和传感头(8)。其中传感头仅用一根传感光纤制作而成，包括液体折射率传感部分和和液体温度传感部分，具备体积小，制作简单，抗电磁干扰的特点，克服了现有技术中，传感器制作复杂，测量距离短，液体折射率和温度不能同时测量的局限。本发明适用于对液体的折射率和温度远距离同时在线测量需求领域。
An optical fiber sensing liquid refractive index and temperature simultaneous measurement system and measurement method belong to the field of optical fiber sensing detection. It is to solve the problem of simultaneous long-distance online measurement of liquid refractive index and temperature. A system and method for simultaneously measuring the refractive index and temperature of an optical fiber sensing liquid according to the present invention, the system includes: a light source (1), a wavelength division multiplexer (2), a photoelectric detector (3), and an acquisition card (4 ), computer (5), optical fiber constant temperature bath (6), sensing optical fiber (7) and sensing head (8). The sensing head is made of only one sensing optical fiber, including the liquid refractive index sensing part and the liquid temperature sensing part. It has the characteristics of small size, simple manufacture, and anti-electromagnetic interference, which overcomes the problems in the prior art. The sensor is complicated to make, the measurement distance is short, and the liquid refractive index and temperature cannot be measured at the same time. The invention is suitable for the field of long-distance and simultaneous online measurement of the liquid's refractive index and temperature.
Description
技术领域technical field
本发明涉及光纤传感检测领域，特别是涉及一种光纤传感液体折射率和温度同时测量系统及测量方法。The invention relates to the field of optical fiber sensing and detection, in particular to an optical fiber sensing liquid refractive index and temperature simultaneous measurement system and measurement method.
背景技术Background technique
折射率是液体介质重要的物理参数之一，在日常生产生活中的各个方面都具有着重要的地位，此外，液体介质的许多性质都可以从其折射率上得到反映，例如液体浓度、温度、混合物成分以及PH值等。所以对于液体折射率的测量在生化分析，环境污染监测，医疗食品等领域有着广泛的应用。折射率的测量方法有多种，其中常用的折射率测量仪器为阿贝测量仪，这种方法需要将被测物放入仪器进行测量，无法满足远距离在线自动化测量的要求。随着光纤传感技术的快速发展，光纤传感器本身因具备体积小，耐腐蚀，抗电磁干扰等特点，采用光纤传感的方法测量液体折射率的方法和技术渐渐受到关注。此外，由于液体折射率受液体的浓度、温度等因素的影响，因而，只有在一定温度下测得的折射率才有意义。因此，需要对折射率和温度同时进行测量。The refractive index is one of the important physical parameters of the liquid medium, which plays an important role in all aspects of daily production and life. In addition, many properties of the liquid medium can be reflected from its refractive index, such as liquid concentration, temperature, Mixture composition and pH value etc. Therefore, the measurement of liquid refractive index has a wide range of applications in biochemical analysis, environmental pollution monitoring, medical food and other fields. There are many ways to measure the refractive index. The commonly used refractive index measuring instrument is the Abbe meter. This method needs to put the measured object into the instrument for measurement, which cannot meet the requirements of long-distance online automatic measurement. With the rapid development of optical fiber sensing technology, the optical fiber sensor itself has the characteristics of small size, corrosion resistance, and anti-electromagnetic interference. The method and technology of measuring the refractive index of liquid by optical fiber sensing has gradually attracted attention. In addition, since the refractive index of liquid is affected by factors such as the concentration and temperature of the liquid, only the refractive index measured at a certain temperature is meaningful. Therefore, simultaneous measurement of the refractive index and temperature is required.
发明内容Contents of the invention
本发明是为了解决远距离液体折射率和温度同时在线测量的问题，现提供一种光纤传感液体折射率和温度同时测量系统及测量方法。The invention aims to solve the problem of simultaneous on-line measurement of long-distance liquid refractive index and temperature, and now provides a simultaneous measurement system and measurement method of optical fiber sensing liquid refractive index and temperature.
一种光纤传感液体折射率和温度同时测量系统，包括：光源，波分复用器、光电探测器、采集卡、计算机、光纤恒温槽、传感光纤和传感头；A system for simultaneously measuring the refractive index and temperature of an optical fiber sensing liquid, comprising: a light source, a wavelength division multiplexer, a photodetector, an acquisition card, a computer, an optical fiber constant temperature bath, a sensing optical fiber, and a sensing head;
所述波分复用器有四个端口，分别为a，b，c，d端口；光源输出的脉冲由波分复用器的a端口输入，波分复用器的b端口通过光纤恒温槽与传感光纤相连接，传感光纤另一端与浸没在待测液体中的传感头相连接；波分复用器的c、d端口共同与光电探测器相连接，光电探测器的信号输出端与采集卡的信号输入端相连接；采集卡的信号输出端与计算机的信号输入端相连接；光纤恒温槽的温度信息通过串口传输至计算机；波分复用器具备滤波功能，可以将b端口输入的由传感头所探测到的光滤波后得到拉曼反斯托克斯光和拉曼斯托克斯光，并分别由c，d端口输出至光电探测器。The wavelength division multiplexer has four ports, namely a, b, c, and d ports; the pulse output by the light source is input by the a port of the wavelength division multiplexer, and the b port of the wavelength division multiplexer passes through the optical fiber thermostat It is connected with the sensing fiber, and the other end of the sensing fiber is connected with the sensing head immersed in the liquid to be tested; the c and d ports of the wavelength division multiplexer are connected with the photodetector together, and the signal output of the photodetector is terminal is connected with the signal input end of the acquisition card; the signal output end of the acquisition card is connected with the signal input end of the computer; the temperature information of the optical fiber constant temperature bath is transmitted to the computer through the serial port; The light detected by the sensor head input through the port is filtered to obtain Raman anti-Stokes light and Raman Stokes light, which are respectively output to the photodetector through ports c and d.
光源发出的脉冲光经a端口进入波分复用器，经b端口输出传输至光纤恒温槽，然后经传感光纤传输至传感头,传感头浸没在待测液体中，传感头探测到的信号沿传感光纤返回，经b端口进入波分复用器，返回的信号经波分复用器滤波后得到拉曼斯托克斯光从c端口输出，拉曼反斯托克斯光从d端口输出，二者经光电探测器转换为电信号后传输至采集卡，采集卡将采集到的信号传输至计算机进行液体折射率和温度信息的解调显示。光纤恒温槽的温度信息通过串口传输至计算机。The pulsed light emitted by the light source enters the wavelength division multiplexer through the a port, and is transmitted to the optical fiber constant temperature bath through the b port, and then transmitted to the sensing head through the sensing optical fiber. The sensing head is immersed in the liquid to be tested, and the sensing head detects The received signal returns along the sensing fiber, enters the wavelength division multiplexer through the b port, and the returned signal is filtered by the wavelength division multiplexer to obtain Raman Stokes light output from the c port, Raman anti-Stokes The light is output from the d port, and the two are converted into electrical signals by the photodetector and then transmitted to the acquisition card. The acquisition card transmits the collected signal to the computer for demodulation and display of the liquid refractive index and temperature information. The temperature information of the fiber optic constant temperature bath is transmitted to the computer through the serial port.
一种光纤传感液体折射率和温度同时测量系统，包括光源，波分复用器、光电探测器、采集卡、计算机、光纤恒温槽、传感光纤、传感头和多通道光开关；所述传感光纤和传感头均为多个；A simultaneous measurement system for optical fiber sensing liquid refractive index and temperature, including light source, wavelength division multiplexer, photoelectric detector, acquisition card, computer, optical fiber constant temperature tank, sensing optical fiber, sensing head and multi-channel optical switch; There are multiple sensing optical fibers and sensing heads;
所述波分复用器有四个端口，分别为a，b，c，d端口；光源输出的脉冲由波分复用器的a端口输入，波分复用器的b端口通过光纤恒温槽与多通道光开关相连接，多通道光开关与多个传感光纤相连接，每个传感光纤的另一端均连接有一个浸没在待测液体中的传感头；波分复用器的c、d端口共同与光电探测器相连接，光电探测器的信号输出端与采集卡的信号输入端相连接；采集卡的信号输出端与计算机的信号输入端相连接；光纤恒温槽的温度信息通过串口传输至计算机；波分复用器具备滤波功能，可以将b端口输入的由传感头所探测到的光滤波后得到拉曼反斯托克斯光和拉曼斯托克斯光，并分别由c，d端口输出至光电探测器。The wavelength division multiplexer has four ports, namely a, b, c, and d ports; the pulse output by the light source is input by the a port of the wavelength division multiplexer, and the b port of the wavelength division multiplexer passes through the optical fiber thermostat It is connected with a multi-channel optical switch, and the multi-channel optical switch is connected with a plurality of sensing optical fibers, and the other end of each sensing optical fiber is connected with a sensing head immersed in the liquid to be measured; the wavelength division multiplexer The c and d ports are connected with the photodetector together, and the signal output end of the photodetector is connected with the signal input end of the acquisition card; the signal output end of the acquisition card is connected with the signal input end of the computer; the temperature information of the optical fiber constant temperature bath It is transmitted to the computer through the serial port; the wavelength division multiplexer has a filtering function, which can filter the light detected by the sensor head input by the b port to obtain Raman anti-Stokes light and Raman Stokes light, And output to the photodetector through the c and d ports respectively.
光源发出的脉冲光经a端口进入波分复用器，经b端口输出传输至光纤恒温槽，然后脉冲光进入多通道光开关,经多通道光开关选择传感通道，然后经传感光纤传输至传感头,传感头浸没在待测液体中，传感头探测到的信号沿传感光纤返回，经b端口进入波分复用器，返回的信号经波分复用器滤波后得到拉曼斯托克斯光从c端口输出，拉曼反斯托克斯光从d端口输出，二者经光电探测器转换为电信号后传输至采集卡，采集卡将采集到的信号传输至计算机进行液体折射率和温度信息的解调显示。光纤恒温槽的温度信息通过串口传输至计算机。The pulsed light emitted by the light source enters the wavelength division multiplexer through the a port, and is transmitted to the optical fiber constant temperature tank through the b port output, and then the pulsed light enters the multi-channel optical switch, selects the sensing channel through the multi-channel optical switch, and then transmits it through the sensing fiber To the sensor head, the sensor head is immersed in the liquid to be tested, the signal detected by the sensor head returns along the sensing fiber, enters the wavelength division multiplexer through the b port, and the returned signal is filtered by the wavelength division multiplexer to obtain Raman Stokes light is output from port c, and Raman anti-Stokes light is output from port d. The two are converted into electrical signals by photodetectors and then transmitted to the acquisition card. The acquisition card transmits the collected signals to The computer performs demodulation and display of liquid refractive index and temperature information. The temperature information of the fiber optic constant temperature bath is transmitted to the computer through the serial port.
所述传感头包括两部分：光纤环和光纤末端；其中光纤环作为液体温度传感器，光纤末端作为液体折射率传感器，光纤末端需剥去包层，切割成垂直光滑的表面，为了避免光纤弯曲损耗，光纤环的直径应大于5厘米。The sensor head consists of two parts: an optical fiber ring and an optical fiber end; the optical fiber ring is used as a liquid temperature sensor, and the optical fiber end is used as a liquid refractive index sensor. The optical fiber end needs to be stripped of the cladding and cut into a vertical smooth surface. loss, the diameter of the fiber optic ring should be greater than 5 cm.
一种光纤传感液体折射率和温度同时测量方法，该方法是基于上述系统实现的，包括以下步骤：A method for simultaneously measuring the refractive index and temperature of an optical fiber sensing liquid, the method is realized based on the above system, and includes the following steps:
步骤一：将传感头浸入蒸馏水中，利用上述系统获得拉曼反斯托克斯光强度(I0as)作为液体折射率传感基准值，利用上述系统获得拉曼反斯托克斯光强度(I0as)和拉曼斯托克斯光强度(I0s)的比值R(T0)作为液体温度传感基准值，然后执行步骤二；Step 1: Immerse the sensing head in distilled water, use the above system to obtain the Raman anti-Stokes light intensity (I 0as ) as the reference value for liquid refractive index sensing, and use the above system to obtain the Raman anti-Stokes light intensity (I 0as ) and the ratio R(T 0 ) of the Raman Stokes light intensity (I 0s ) as the liquid temperature sensing reference value, and then perform step 2;
步骤二：将传感头浸入待测液体中，利用上述系统获得拉曼反斯托克斯光强度(Ias)作为液体折射率传感测量值，利用上述系统获得拉曼反斯托克斯光强度(Ias)和拉曼斯托克斯光强度(Is)比值R(T)作为液体温度传感测量值，然后执行步骤三；Step 2: Immerse the sensor head in the liquid to be measured, use the above system to obtain the Raman anti-Stokes light intensity (I as ) as the liquid refractive index sensing value, and use the above system to obtain the Raman anti-Stokes Light intensity (I as ) and Raman Stokes light intensity (I s ) ratio R(T) is used as liquid temperature sensing measurement value, and then perform step three;
步骤三：利用液体折射率传感基准值I0as和液体折射率传感测量值Ias，获得光纤末端与待测液体接触面的反射率R，利用液体温度传感基准值R(T0)和液体温度传感测量值R(T)的比值，获得待测液体温度的指示量M，然后执行步骤四；Step 3: Use the liquid refractive index sensing reference value I 0as and the liquid refractive index sensing measurement value I as to obtain the reflectivity R of the contact surface between the end of the optical fiber and the liquid to be measured, and use the liquid temperature sensing reference value R(T 0 ) and the ratio of the liquid temperature sensor measurement value R (T), to obtain the indicated amount M of the temperature of the liquid to be measured, and then perform step 4;
步骤四：利用步骤三获得的光纤末端与待测液体接触面的反射率R，获得待测液体的折射率ns；利用步骤三获得的待测液体温度的指示量M，获得待测液体的温度T。Step 4: Use the reflectivity R of the contact surface between the end of the optical fiber and the liquid to be measured obtained in step 3 to obtain the refractive index n s of the liquid to be measured; use the indicated amount M of the temperature of the liquid to be measured obtained in step 3 to obtain the liquid to be measured temperature T.
本发明所述的一种光纤传感液体折射率和温度同时测量系统及测量方法，克服了现有技术中，传感器制作复杂，测量距离短，液体折射率和温度不能同时测量的局限，适用于对液体的折射率和温度实现远距离同时在线测量。The optical fiber sensing liquid refractive index and temperature simultaneous measurement system and measurement method described in the present invention overcome the limitations in the prior art that the sensor is complicated to make, the measurement distance is short, and the liquid refractive index and temperature cannot be measured simultaneously, and is suitable for Realize long-distance simultaneous online measurement of the refractive index and temperature of the liquid.
附图说明Description of drawings
图1为一种光纤传感液体折射率和温度同时测量的系统的一种结构示意图；Fig. 1 is a kind of structure schematic diagram of the system of a kind of optical fiber sensing liquid refractive index and temperature measurement simultaneously;
图2为一种光纤传感液体折射率和温度同时测量的系统另一种结构示意图；Fig. 2 is another structural schematic diagram of a system for simultaneously measuring the refractive index and temperature of a fiber-optic sensing liquid;
图3为光纤传感头结构示意图；Fig. 3 is a structural schematic diagram of an optical fiber sensing head;
图4为一种光纤传感液体折射率和温度同时测量方法的流程图。Fig. 4 is a flow chart of a method for simultaneously measuring the refractive index and temperature of an optical fiber sensing liquid.
1-光源，2-波分复用器，3-光电探测器，4-采集卡，5-计算机，6-光纤恒温槽，7-传感光纤，8-传感头，9-多通道光开关。1-light source, 2-wavelength division multiplexer, 3-photodetector, 4-acquisition card, 5-computer, 6-optical fiber constant temperature tank, 7-sensing optical fiber, 8-sensing head, 9-multi-channel light switch.
具体实施方式Detailed ways
具体实施方式一：参照图1具体说明本实施方式，本实施方式所述一种光纤传感液体折射率和温度同时测量的系统，它包括：光源1，波分复用器2、光电探测器3、采集卡4、计算机5，光纤恒温槽6、传感光纤7和传感头8；Specific embodiment 1: This embodiment is described in detail with reference to Fig. 1, a system for simultaneously measuring the refractive index and temperature of an optical fiber sensing liquid described in this embodiment, which includes: a light source 1, a wavelength division multiplexer 2, a photodetector 3. Acquisition card 4, computer 5, optical fiber constant temperature bath 6, sensing optical fiber 7 and sensing head 8;
光源发出的脉冲光经a端口进入波分复用器，经b端口输出传输至光纤恒温槽，然后经传感光纤传输至传感头,传感头浸没在待测液体中，传感头探测到的信号沿传感光纤返回，经b端口进入波分复用器，返回的信号经波分复用器滤波后得到拉曼斯托克斯光从c端口输出，拉曼反斯托克斯光从d端口输出，二者经光电探测器转换为电信号后传输至采集卡，采集卡将采集到的信号传输至计算机进行液体折射率和温度信息的解调显示。光纤恒温槽的温度信息通过串口传输至计算机。The pulsed light emitted by the light source enters the wavelength division multiplexer through the a port, and is transmitted to the optical fiber constant temperature bath through the b port, and then transmitted to the sensing head through the sensing optical fiber. The sensing head is immersed in the liquid to be tested, and the sensing head detects The received signal returns along the sensing fiber, enters the wavelength division multiplexer through the b port, and the returned signal is filtered by the wavelength division multiplexer to obtain Raman Stokes light output from the c port, Raman anti-Stokes The light is output from the d port, and the two are converted into electrical signals by the photodetector and then transmitted to the acquisition card. The acquisition card transmits the collected signal to the computer for demodulation and display of the liquid refractive index and temperature information. The temperature information of the fiber optic constant temperature bath is transmitted to the computer through the serial port.
具体实施方式二：参照图2具体说明本实施方式，本实施方式所述一种光纤传感液体折射率和温度同时测量的系统，它包括：光源1，波分复用器2、光电探测器3、采集卡4、计算机5，光纤恒温槽6、多通道光开关9、传感光纤7和传感头8；Specific embodiment two: this embodiment is described in detail with reference to Fig. 2, a kind of optical fiber sensing liquid refractive index and temperature measurement system simultaneously described in this embodiment, it comprises: light source 1, wavelength division multiplexer 2, photodetector 3. Acquisition card 4, computer 5, optical fiber constant temperature tank 6, multi-channel optical switch 9, sensing optical fiber 7 and sensing head 8;
光源发出的脉冲光经a端口进入波分复用器，经b端口输出传输至光纤恒温槽，然后脉冲光进入多通道光开关,经多通道光开关选择传感通道，然后经传感光纤传输至传感头,传感头浸没在待测液体中，传感头探测到的信号沿传感光纤返回，经b端口进入波分复用器，返回的信号经波分复用器滤波后得到拉曼斯托克斯光从c端口输出，拉曼反斯托克斯光从d端口输出，二者经光电探测器转换为电信号后传输至采集卡，采集卡将采集到的信号传输至计算机进行液体折射率和温度信息的解调显示。光纤恒温槽的温度信息通过串口传输至计算机。The pulsed light emitted by the light source enters the wavelength division multiplexer through the a port, and is transmitted to the optical fiber constant temperature tank through the b port output, and then the pulsed light enters the multi-channel optical switch, selects the sensing channel through the multi-channel optical switch, and then transmits it through the sensing fiber To the sensor head, the sensor head is immersed in the liquid to be tested, the signal detected by the sensor head returns along the sensing fiber, enters the wavelength division multiplexer through the b port, and the returned signal is filtered by the wavelength division multiplexer to obtain Raman Stokes light is output from port c, and Raman anti-Stokes light is output from port d. The two are converted into electrical signals by photodetectors and then transmitted to the acquisition card. The acquisition card transmits the collected signals to The computer performs demodulation and display of liquid refractive index and temperature information. The temperature information of the fiber optic constant temperature bath is transmitted to the computer through the serial port.
具体实施方式三：本实施方式是对具体实施方式一所述的波分复用器作进一步说明，本实施例中，所述波分复用器有四个端口，分别为a，b，c，d端口，波分复用器具备滤波功能，可以将d端口输入的光滤波得到拉曼反斯托克斯光和拉曼斯托克斯光。Specific embodiment three: this embodiment is a further description of the wavelength division multiplexer described in specific embodiment one, in this embodiment, the wavelength division multiplexer has four ports, respectively a, b, c , the d port, the wavelength division multiplexer has a filtering function, and can filter the light input at the d port to obtain Raman anti-Stokes light and Raman Stokes light.
具体实施方式四：参照图3具体说明本实施方式，本实施方式是对具体实施方式一或二所述的传感头作进一步说明，本实施例中，所述传感头包括两部分：一个光纤末端和一个光纤环；其中光纤环作为液体温度传感器，光纤末端作为液体折射率传感器，光纤末端需剥去包层，切割成垂直光滑的表面，为了避免光纤弯曲损耗，光纤环的直径应大于5厘米。Specific Embodiment 4: This embodiment will be described in detail with reference to Fig. 3. This embodiment is a further description of the sensor head described in Embodiment 1 or 2. In this embodiment, the sensor head includes two parts: a The fiber end and a fiber ring; the fiber ring is used as a liquid temperature sensor, and the fiber end is used as a liquid refractive index sensor. The fiber end needs to be stripped of the cladding and cut into a vertical smooth surface. In order to avoid fiber bending loss, the diameter of the fiber ring should be larger than 5 cm.
具体实施方式五：参照图4具体说明本实施方式，本实施方式所述的一种光纤传感液体折射率和温度同时测量的方法，该方法是基于上述系统实现的，具体实施包括以下步骤：Specific embodiment five: this embodiment is specifically described with reference to Fig. 4, a kind of optical fiber sensing liquid refractive index and the method for temperature simultaneous measurement described in this embodiment, this method is realized based on above-mentioned system, concrete implementation comprises the following steps:
步骤一：将传感头浸入蒸馏水中，利用上述系统获得拉曼反斯托克斯光强度(I0as)作为液体折射率传感基准值，利用上述系统获得拉曼反斯托克斯光强度(I0as)和拉曼斯托克斯光强度(I0s)的比值R(T0)作为液体温度传感基准值，然后执行步骤二；Step 1: Immerse the sensing head in distilled water, use the above system to obtain the Raman anti-Stokes light intensity (I 0as ) as the reference value for liquid refractive index sensing, and use the above system to obtain the Raman anti-Stokes light intensity (I 0as ) and the ratio R(T 0 ) of the Raman Stokes light intensity (I 0s ) as the liquid temperature sensing reference value, and then perform step 2;
步骤二：将传感头浸入待测液体中，利用上述系统获得拉曼反斯托克斯光强度(Ias)作为液体折射率传感测量值，利用上述系统获得拉曼反斯托克斯光强度(Ias)和拉曼斯托克斯光强度(Is)比值R(T)作为液体温度传感测量值，然后执行步骤三；Step 2: Immerse the sensor head in the liquid to be measured, use the above system to obtain the Raman anti-Stokes light intensity (I as ) as the liquid refractive index sensing value, and use the above system to obtain the Raman anti-Stokes Light intensity (I as ) and Raman Stokes light intensity (I s ) ratio R(T) is used as liquid temperature sensing measurement value, and then perform step three;
步骤三：利用液体折射率传感基准值I0as和液体折射率传感测量值Ias，获得光纤末端与待测液体接触面的反射率R，利用液体温度传感基准值R(T0)和液体温度传感测量值R(T)的比值，获得待测液体温度的指示量M，然后执行步骤四；Step 3: Use the liquid refractive index sensing reference value I 0as and the liquid refractive index sensing measurement value I as to obtain the reflectivity R of the contact surface between the end of the optical fiber and the liquid to be measured, and use the liquid temperature sensing reference value R(T 0 ) and the ratio of the liquid temperature sensor measurement value R (T), to obtain the indicated amount M of the temperature of the liquid to be measured, and then perform step 4;
步骤四：利用步骤三获得的光纤末端与待测液体接触面的反射率R，获得待测液体的折射率ns；利用步骤三获得的待测液体温度的指示量M，获得待测液体的温度T。Step 4: Use the reflectivity R of the contact surface between the end of the optical fiber and the liquid to be measured obtained in step 3 to obtain the refractive index n s of the liquid to be measured; use the indicated amount M of the temperature of the liquid to be measured obtained in step 3 to obtain the liquid to be measured temperature T.
具体实施方式六：本实施方式是对具体实施方式五所述的一种光纤传感液体折射率和温度同时测量的方法作进一步说明，本实施方式中，根据如下公式获得光纤末端与待测液体接触面的反射率R，Specific embodiment six: This embodiment is a further description of the method for simultaneously measuring the refractive index and temperature of a fiber-optic sensing liquid described in specific embodiment five. In this embodiment, the optical fiber end and the liquid to be measured are obtained according to the following formula The reflectivity R of the contact surface,
其中，nf为光纤纤芯折射率，n0位蒸馏水的折射率。Among them, n f is the refractive index of the fiber core, and n is the refractive index of distilled water at the 0 position.
具体实施方式七：本实施方式是对具体实施方式五所述的一种光纤传感液体折射率和温度同时测量的方法作进一步说明，本实施方式中，根据如下公式获得待测液体的折射率ns，Specific embodiment seven: This embodiment is a further description of the method for simultaneously measuring the refractive index and temperature of a fiber-optic sensing liquid described in specific embodiment five. In this embodiment, the refractive index of the liquid to be measured is obtained according to the following formula n s ,
具体实施方式八：本实施方式是对具体实施方式五所述的一种光纤传感液体折射率和温度同时测量的方法作进一步说明，本实施方式中，根据如下公式获得液体温度传感基准值R(T0)和液体温度传感测量值R(T)，Embodiment 8: This embodiment is a further description of the method for simultaneously measuring the refractive index and temperature of a fiber-optic sensing liquid described in Embodiment 5. In this embodiment, the liquid temperature sensing reference value is obtained according to the following formula R(T 0 ) and liquid temperature sensing measurement R(T),
其中，vas和vs分别为反斯托克斯和斯托克斯光的频率，h为普朗克常量，c为光速，k为玻尔兹曼常量，Δv为拉曼声子频率。where v as and v s are the frequencies of anti-Stokes and Stokes light, respectively, h is Planck's constant, c is the speed of light, k is Boltzmann's constant, and Δv is the Raman phonon frequency.
具体实施方式九：本实施方式是对具体实施方式五所述的一种光纤传感液体折射率和温度同时测量的方法作进一步说明，本实施方式中，根据如下公式获得待测液体温度的指示量M，Specific embodiment nine: This embodiment is a further description of the method for simultaneously measuring the refractive index and temperature of a fiber-optic sensing liquid described in specific embodiment five. In this embodiment, the indication of the temperature of the liquid to be measured is obtained according to the following formula amount M,
具体实施方式十：本实施方式是对具体实施方式五所述的一种光纤传感液体折射率和温度同时测量的方法作进一步说明，本实施方式中，根据如下公式获得待测液体温度T,Embodiment 10: This embodiment is a further description of the method for simultaneously measuring the refractive index and temperature of a fiber-optic sensing liquid described in Embodiment 5. In this embodiment, the temperature T of the liquid to be measured is obtained according to the following formula,
以上所述实施例仅表达了本发明的几种实施方式，其描述较为具体和详细，但并不能因此而理解为对发明专利范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本发明构思的前提下，还可以做出若干变形和改进，这些都属于本发明的保护范围。The above-mentioned embodiments only express several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but should not be construed as limiting the patent scope of the invention. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention.
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