Multi-parameter liquid detection experimental device based on michelson interferometer

Abstract

The application relates to the technical field of liquid detection, in particular to a multi-parameter liquid detection experiment device based on a Michelson interferometer, which comprises an interferometer main body, a signal acquisition module, a data processing unit and a multi-parameter sensor assembly. The interferometer main body is provided with an adjusting groove, a sliding support and a beam splitter seat, the angle of a beam splitter lens is adjustable, a wide-spectrum light source and a photoelectric detector are symmetrically arranged, the signal acquisition module is connected with the photoelectric detector through an optical fiber, the data processing unit adopts an embedded processor, and the multi-parameter sensor assembly comprises temperature, concentration and liquid level sensors and respectively detects liquid related parameters. The application can realize synchronous high-precision detection of liquid refractive index, temperature, concentration and liquid level, has the characteristics of compact structure, simple operation and high automation degree, and is suitable for teaching experiments and scientific research applications.

Description

Technical Field

[0001] This invention belongs to the field of optical detection and liquid analysis technology, specifically a multi-parameter liquid detection experimental device based on a Michelson interferometer. Background Technology

[0002] The Michelson interferometer, as an important optical measurement tool, is widely used in the analysis of optical properties such as refractive index and dispersion of liquids. Its high sensitivity and non-contact measurement capabilities give it a significant advantage in the analysis of transparent media properties. The technical solution published in CN106500591 B proposes an integrated multi-band Michelson interferometer that independently detects multi-band white light interference signals through a broadband light source and an 8-band photodetector, and measures refractive index and dispersion characteristics using a beam splitter and its adjustment system. This solution excels in acquiring spectral information, but it primarily focuses on optical property measurements and struggles to simultaneously detect other physical parameters of the liquid (such as temperature and concentration). Furthermore, the device's structural design requires high adjustment precision, which may present certain challenges in practical operation.

[0003] Another technical solution, CN115791702B, provides a method for measuring the refractive index of a liquid based on changes in liquid level. This method uses a helium-neon laser, beam expander, beam splitter, and reflector to form an interference optical path, and manually adjusts the liquid level to change the optical path difference to achieve refractive index measurement. While it has some innovation in refractive index measurement, it can only detect a single parameter and cannot be extended to the simultaneous measurement of multiple liquid parameters. Furthermore, the device relies on manual adjustment of the liquid level, which may introduce human error during the measurement process, and its efficiency needs improvement.

[0004] In summary, existing liquid parameter detection devices based on Michelson interferometers generally suffer from the following characteristics: First, their functions are concentrated on single-parameter measurement, making it difficult to meet the needs of simultaneous multi-parameter detection; second, some devices require high adjustment precision in their structural design, posing a certain operational barrier in practical applications; and third, their automation level is limited, with frequent reliance on manual intervention, which may affect measurement efficiency and accuracy. Therefore, there is an urgent need for a novel multi-parameter liquid detection experimental device based on a Michelson interferometer to achieve simultaneous measurement of multiple parameters such as liquid refractive index, concentration, and temperature, while also considering compact structure, ease of operation, and high automation, thus better meeting the needs of teaching experiments and scientific research applications. Utility Model Content

[0005] This invention provides a multi-parameter liquid detection experimental device based on a Michelson interferometer, comprising an interferometer body, a signal acquisition module, a data processing unit, and a multi-parameter sensor assembly.

[0006] The interferometer body is fixedly mounted on the experimental platform. Symmetrically distributed adjustment slots are formed on its upper surface. These slots have a rectangular cross-section and are used to mount sliding supports. The sliding supports are slidably connected to the adjustment slots via bolts. A beam splitter mount is fixedly mounted on top of the sliding supports, and a beam splitter lens is embedded inside the mount. The angle of the beam splitter lens can be adjusted using an adjusting screw. A light source bracket is fixedly mounted on one side of the beam splitter mount, and a broadband light source is mounted on the bracket. The beam direction of the broadband light source forms a 45° angle with the beam splitter lens.

[0007] The signal acquisition module is fixedly mounted on one side of the interferometer body. The input end of the module is connected to four photodetectors via optical fiber, symmetrically arranged on the reflected and transmitted light paths of the beam splitter. Each photodetector is connected to the interferometer body via a mounting bracket. The bottom of the bracket has positioning holes with embedded rubber gaskets to reduce the impact of vibration on the photodetectors. The output end of the signal acquisition module is connected to the data processing unit via a 50cm long ribbon cable to ensure stable signal transmission.

[0008] The data processing unit is fixedly mounted below the signal acquisition module. Its core component is an embedded processor, which is soldered onto a circuit board. The circuit board is surrounded by heat sink fins, each 10mm high, to improve heat dissipation efficiency. The embedded processor communicates with the signal acquisition module via an SPI interface, with a sampling frequency set to 2kHz. The data processing unit's casing is made of aluminum alloy and anodized to enhance corrosion resistance.

[0009] The multi-parameter sensor assembly includes a temperature sensor, a concentration sensor, and a level sensor. The temperature sensor is fixedly mounted at the bottom of the interferometer body, with its probe passing through the bottom panel of the interferometer body. A sealing ring seals the probe to the bottom panel to prevent liquid leakage. The signal output of the temperature sensor is connected to the data processing unit via a shielded cable, which is wrapped with an insulating layer to reduce electromagnetic interference. The concentration sensor is fixedly mounted on the side of the interferometer body, with its sensing end in contact with the liquid. The surface of the sensing end is coated with a corrosion-resistant coating to extend its service life. The level sensor is fixedly mounted at the top of the interferometer body, with its sensing end connected to the liquid container via a 3mm inner diameter conduit to ensure real-time monitoring of level changes.

[0010] Furthermore, the bottom of the interferometer body is equipped with four support feet, evenly distributed at the four corners of the interferometer body. Each support foot has a 5mm thick anti-slip pad embedded in its bottom to improve the stability of the device. The top of the support feet is connected to the interferometer body via threads with a diameter of 8mm and a pitch of 1.5mm to ensure a secure connection.

[0011] Furthermore, limiting grooves are provided on both sides of the sliding bracket, with a width of 10mm and a depth of 5mm, to limit the movement range of the sliding bracket. The inner wall of the limiting groove is polished to reduce friction. A mounting hole with a diameter of 6mm is provided on the top of the sliding bracket for fixing the beam splitter mount. A positioning pin with a diameter of 5mm and a length of 10mm is provided at the bottom of the beam splitter mount. The positioning pin is inserted into the mounting hole and fixed by a nut.

[0012] Furthermore, the broadband light source's housing is made of stainless steel with a thickness of 2mm to enhance its impact resistance. A 1mm thick filter is installed at the light outlet of the broadband light source to filter stray light. The filter is connected to the broadband light source's housing via two clips, located on opposite sides of the filter.

[0013] Furthermore, the photodetector's mounting bracket is made of aluminum alloy with a thickness of 3mm to ensure structural strength. Two adjustment knobs are located on the top of the bracket, one for adjusting the horizontal position and the other for adjusting the vertical position of the photodetector. The adjustment knobs have a thread diameter of 4mm and a pitch of 0.75mm to achieve precise position adjustment.

[0014] Furthermore, the probe portion of the temperature sensor is made of platinum resistance material, with a diameter of 2mm and a length of 10mm to improve measurement accuracy. The signal output terminal of the temperature sensor is connected to the shielded wire by soldering, and the solder joint is coated with insulating glue to prevent short circuits.

[0015] Furthermore, the sensing end of the concentration sensor is designed based on electrochemical principles, with a diameter of 3mm and a length of 15mm to accommodate the detection needs of different liquids. The signal output end of the concentration sensor is connected to the data processing unit via a plug-in connection, with three terminals corresponding to the power supply, ground, and signal lines, respectively.

[0016] Furthermore, the sensing end of the liquid level sensor adopts an ultrasonic principle design, with a diameter of 4mm and a length of 20mm, to achieve non-contact liquid level detection. The signal output end of the liquid level sensor is fixed to the conduit via a threaded connection with a thread diameter of 5mm and a pitch of 1mm to ensure a tight seal.

[0017] This invention, through the aforementioned specific structural design, solves the problems of limited functionality, complex operation, and insufficient automation in existing technologies. The adjustable angle design of the beam splitter, combined with the layout of the broadband light source and photodetector, enables high-precision measurement of the liquid's refractive index. The introduction of multi-parameter sensor components allows the device to simultaneously detect parameters such as liquid temperature, concentration, and level, meeting the requirements for simultaneous multi-parameter detection. Efficient communication between the embedded processor and the signal acquisition module improves the real-time performance and accuracy of data processing. The overall structure is compact and easy to operate, making it suitable for teaching experiments and scientific research applications. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention, showing the layout of the interferometer body, sliding support, beam splitter mount, and broadband light source.

[0019] Figure 2 This diagram shows the connection between the signal acquisition module and the photodetector, illustrating the distribution and fixing method of the photodetector in the reflection and transmission optical paths of the beam splitter.

[0020] Figure 3 This is a schematic diagram of the data processing unit structure, highlighting the structural design of the embedded processor, heat sink, and housing.

[0021] Figure 4 This is a schematic diagram showing the installation locations of the multi-parameter sensor assembly, with the specific arrangement of the temperature sensor, concentration sensor, and liquid level sensor on the main body of the interferometer clearly marked.

[0022] Figure 5 This diagram shows the detailed structure of the sliding bracket and beam splitter mount adjustment mechanism, illustrating the design of the sliding bracket's limiting groove, mounting holes, and beam splitter mount's positioning pin. The reference numerals are as follows: 1. Interferometer body; 2. Sliding bracket; 3. Beam splitter mount; 4. Beam splitter lens; 5. Broadband light source; 6. Photodetector; 7. Signal acquisition module; 8. Data processing unit; 9. Embedded processor; 10. Heat sink; 11. Temperature sensor; 12. Concentration sensor; 13. Liquid level sensor; 14. Support foot; 15. Limiting groove; 16. Positioning pin. Detailed Implementation

[0023] This invention provides a multi-parameter liquid detection experimental device based on a Michelson interferometer. The specific implementation method is described in detail below with reference to the accompanying drawings. Figures 1 to 5As shown, this device includes an interferometer body 1, a sliding bracket 2, a beam splitter mount 3, a beam splitter lens 4, a broadband light source 5, a photodetector 6, a signal acquisition module 7, a data processing unit 8, an embedded processor 9, a heat sink 10, a temperature sensor 11, a concentration sensor 12, a liquid level sensor 13, a support foot 14, a limiting groove 15, and a positioning pin 16.

[0024] The interferometer body 1 is the core structure of the entire device. It has a rectangular box-like design and is fixedly mounted on the experimental platform. Two symmetrically distributed adjustment slots are formed on the upper surface of the interferometer body 1. These slots have a rectangular longitudinal section and are used to mount the sliding support 2. The sliding support 2 is slidably connected to the adjustment slots via bolts. Limiting grooves 15, 10mm wide and 5mm deep, are formed on both sides of the sliding support 2 to limit its range of motion. The inner walls of the limiting grooves 15 are polished to reduce friction. A mounting hole with a diameter of 6mm is provided on the top of the sliding support 2 to fix the beam splitter mount 3. A positioning pin 16, 5mm in diameter and 10mm long, is provided at the bottom of the beam splitter mount 3. The positioning pin 16 is inserted into the mounting hole and secured with a nut. A beam splitter lens 4 is embedded inside the beam splitter mount 3. The angle of the beam splitter lens 4 can be adjusted using an adjusting screw. A light source bracket is fixedly mounted on one side of the beam splitter mount 3. A broadband light source 5 is mounted on the light source bracket. The housing of the broadband light source 5 is made of stainless steel and is 2mm thick to enhance its impact resistance. A 1mm thick filter is installed at the light outlet of the broadband light source 5 to filter stray light. The filter is connected to the housing of the broadband light source 5 by two clips, located on opposite sides of the filter. The beam direction of the broadband light source 5 forms a 45° angle with the beam splitter 4.

[0025] Four photodetectors 6 are symmetrically arranged on the reflected and transmitted light paths of the beam splitter 4. The mounting brackets for the photodetectors 6 are made of aluminum alloy with a thickness of 3mm to ensure structural strength. Two adjustment knobs are located on the top of the brackets, used to adjust the horizontal and vertical positions of the photodetectors 6 respectively. The adjustment knobs have a thread diameter of 4mm and a pitch of 0.75mm for precise position adjustment. Each photodetector 6 is connected to the interferometer body 1 via the mounting bracket. A positioning hole with a rubber gasket embedded in the bottom of the bracket reduces the impact of vibration on the photodetectors 6. The photodetectors 6 are connected to the input of the signal acquisition module 7 via optical fiber. The signal acquisition module 7 is fixedly mounted on one side of the interferometer body 1. The output of the signal acquisition module 7 is connected to the data processing unit 8 via a 50cm long ribbon cable to ensure signal transmission stability.

[0026] The data processing unit 8 is fixedly mounted below the signal acquisition module 7. The core component of the data processing unit 8 is an embedded processor 9, which is soldered onto the circuit board. Heat sink fins 10, each 10mm high, are arranged around the circuit board to improve heat dissipation efficiency. The embedded processor 9 communicates with the signal acquisition module 7 via an SPI interface, with a sampling frequency set to 2kHz. The housing of the data processing unit 8 is made of aluminum alloy, and its surface is anodized to enhance corrosion resistance.

[0027] Temperature sensor 11 is fixedly mounted at the bottom of the interferometer body 1. The probe of temperature sensor 11 passes through the bottom panel of the interferometer body 1, and a sealing ring is used to seal the probe and the bottom panel to prevent liquid leakage. The probe of temperature sensor 11 is made of platinum resistance material, with a diameter of 2 mm and a length of 10 mm to improve measurement accuracy. The signal output terminal of temperature sensor 11 is connected to data processing unit 8 via a shielded wire. The shielded wire is wrapped with an insulating layer to reduce electromagnetic interference. The signal output terminal of temperature sensor 11 is connected to the shielded wire by soldering, and the solder joint is coated with insulating glue to prevent short circuits.

[0028] The concentration sensor 12 is fixedly mounted on the side of the interferometer body 1. The sensing end of the concentration sensor 12 is in contact with the liquid, and its surface is coated with a corrosion-resistant coating to extend its service life. The sensing end of the concentration sensor 12 is designed based on electrochemical principles, with a diameter of 3 mm and a length of 15 mm to adapt to the detection requirements of different liquids. The signal output terminal of the concentration sensor 12 is connected to the data processing unit 8 via a plug-in connection. There are three plug-in terminals, corresponding to the power supply, ground, and signal lines, respectively.

[0029] The liquid level sensor 13 is fixedly mounted on the top of the interferometer body 1. The sensing end of the liquid level sensor 13 is connected to the liquid container via a conduit with an inner diameter of 3 mm to ensure real-time liquid level changes. The sensing end of the liquid level sensor 13 is designed using ultrasonic principles, with a diameter of 4 mm and a length of 20 mm to achieve non-contact liquid level detection. The signal output end of the liquid level sensor 13 is fixed to the conduit via a threaded connection with a thread diameter of 5 mm and a pitch of 1 mm to ensure a tight seal.

[0030] The bottom of the interferometer body 1 is provided with four support feet 14, which are evenly distributed at the four corners of the interferometer body 1. Each support foot 14 has an anti-slip pad embedded at its bottom, and the anti-slip pad is 5mm thick to improve the stability of the device. The top of the support foot 14 is connected to the interferometer body 1 by threads with a diameter of 8mm and a pitch of 1.5mm to ensure a firm connection.

[0031] When using this device for liquid detection, first, the liquid to be tested is injected into a liquid container, ensuring that the conduit of the liquid container is correctly connected to the sensing end of the liquid level sensor 13. Then, the broadband light source 5 is activated, and the beam emitted by the broadband light source 5, after passing through a filter, illuminates the beam splitter 4. The beam splitter 4 divides the incident light into two beams: one propagates along the reflected light path, and the other propagates along the transmitted light path. Both beams are received by the photodetector 6 and converted into electrical signals, which are then transmitted to the signal acquisition module 7 via optical fiber. After preliminary processing of the electrical signals, the signal acquisition module 7 transmits the data to the data processing unit 8 via a ribbon cable. The embedded processor 9 analyzes and calculates the received data to obtain the refractive index information of the liquid.

[0032] Meanwhile, temperature sensor 11, concentration sensor 12, and level sensor 13 detect the temperature, concentration, and level of the liquid, respectively. The probe of temperature sensor 11 is in direct contact with the liquid, sensing temperature changes through the properties of platinum resistance material and transmitting the signal to data processing unit 8. The sensing end of concentration sensor 12 detects the liquid concentration through an electrochemical reaction and transmits the signal to data processing unit 8. The sensing end of level sensor 13 detects the liquid level using ultrasonic principles and transmits the signal to data processing unit 8. The embedded processor 9 integrates and processes the signals from each sensor, ultimately outputting the multi-parameter detection results of the liquid.

[0033] In actual operation, the angle of the beam splitter 4 can be changed by adjusting the position of the sliding bracket 2, thereby optimizing the alignment of the optical path. Furthermore, the adjustment knob on the mounting bracket of the photodetector 6 can fine-tune the position of the photodetector 6 to ensure the accuracy of optical signal reception. The anti-slip pads on the support feet 14 effectively prevent the device from sliding during the experiment, while the design of the heat sink 10 ensures the stability of the data processing unit 8 during long-term operation.

[0034] The specific embodiments of this utility model have been described above. Through the above structural design and operation process, simultaneous detection of multiple parameters such as liquid refractive index, temperature, concentration, and liquid level is achieved. The connection relationships, positional relationships, and mutual cooperation relationships between the various components are all described in detail, which meets the requirements of Article 26, Paragraph 3 of the Chinese Patent Law. Those skilled in the art can implement this technology based on the contents of the specification.

[0035] To enable those skilled in the art to fully understand and implement this utility model, the operating principle and implementation steps of this device are explained below in conjunction with a specific application scenario.

[0036] In conducting liquid detection experiments, the liquid to be tested is first injected into a liquid container, ensuring that the container's conduit is correctly connected to the sensing end of the liquid level sensor 13. Then, the broadband light source 5 is activated, and its emitted beam, after passing through a filter, illuminates the beam splitter 4 at a 45° angle. The beam splitter 4 divides the incident light into two beams: one propagates along the reflected light path, and the other propagates along the transmitted light path. These two beams are received by the photodetector 6 and converted into electrical signals, which are then transmitted to the signal acquisition module 7 via optical fiber. After preliminary processing of the electrical signals, the signal acquisition module 7 transmits the data to the data processing unit 8 via a cable. The embedded processor 9 analyzes and calculates the received data, deriving the refractive index information of the liquid based on the change in the optical path difference of the interference path.

[0037] Meanwhile, temperature sensor 11, concentration sensor 12, and level sensor 13 detect the temperature, concentration, and level of the liquid, respectively. The probe of temperature sensor 11 is in direct contact with the liquid, utilizing the resistance of platinum resistance material to sense temperature changes and transmitting the signal to data processing unit 8. Concentration sensor 12 detects changes in liquid concentration through an electrochemical reaction; its corrosion-resistant coating effectively extends its lifespan, and its signal output is connected to data processing unit 8 via a plug-in connection to ensure stable signal transmission. Level sensor 13 uses an ultrasonic design, detecting the liquid level in the container in real time via a conduit and transmitting the signal to data processing unit 8 through a threaded conduit. Embedded processor 9 integrates the signals from each sensor, ultimately outputting the multi-parameter detection results of the liquid.

[0038] In actual operation, if the alignment of the interference optical path is found to be poor, the angle of the beam splitter 4 can be changed by adjusting the position of the sliding bracket 2. The limiting grooves 15 on both sides of the sliding bracket 2 restrict its range of movement, and the inner wall is polished to reduce friction, thereby ensuring a smooth and precise adjustment process. The positioning pin 16 of the beam splitter mount 3 is inserted into the mounting hole of the sliding bracket 2 and fixed by a nut, further enhancing the stability of the structure. In addition, the photodetector 6 is equipped with two adjustment knobs on its mounting bracket, which can be used to adjust the horizontal and vertical positions of the photodetector 6 respectively. The adjustment knobs have a thread diameter of 4mm and a pitch of 0.75mm, enabling micron-level precise adjustment, thereby optimizing the reception accuracy of the optical signal.

[0039] The design of the support feet 14 further enhances the overall stability of the device. Each support foot 14 has a 5mm thick anti-slip pad embedded in its bottom, effectively preventing the device from sliding during experiments. The support feet 14 are connected to the interferometer body 1 via threads with a diameter of 8mm and a pitch of 1.5mm, ensuring a secure connection and easy disassembly. The heat sink fins 10 of the data processing unit 8 ensure the stability of the device during long-term operation. The heat sink fins 10 are 10mm high, effectively dissipating the heat generated by the embedded processor 9 during operation and preventing performance degradation due to overheating.

[0040] Through the above steps and design principles, this device achieves simultaneous detection of multiple parameters, including liquid refractive index, temperature, concentration, and liquid level. The adjustable angle design of the beam splitter 4, combined with the layout of the broadband light source 5 and photodetector 6, makes optical path alignment more flexible and precise, thereby improving the sensitivity and accuracy of refractive index measurement. The introduction of the multi-parameter sensor assembly not only expands the detection capabilities but also significantly improves experimental efficiency. Efficient communication between the embedded processor 9 and the signal acquisition module 7 ensures the real-time performance and reliability of data processing, meeting the needs of teaching experiments and scientific research applications.

[0041] The above description is merely a specific embodiment of this utility model and is not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A multi-parameter liquid detection experimental device based on a Michelson interferometer, comprising an interferometer body (1), a signal acquisition module (7), a data processing unit (8), and a multi-parameter sensor assembly, characterized in that, Two symmetrically distributed adjustment slots are provided on the upper surface of the interferometer body (1). The sliding bracket (2) is slidably connected to the adjustment slots by bolts. A beam splitter mount (3) is fixedly installed on the top of the sliding bracket (2). A beam splitter lens (4) is embedded inside the beam splitter mount (3). The angle of the beam splitter lens (4) is adjusted by an adjustment screw. A light source bracket is fixedly installed on one side of the beam splitter mount (3). A broadband light source (5) is installed on the light source bracket. The beam direction of the broadband light source (5) is at a 45° angle with the beam splitter lens (4). The signal acquisition module (7) is fixedly installed on one side of the interferometer body (1). The signal acquisition module (7) has... The input end is connected to four photodetectors (6) via optical fiber. The four photodetectors (6) are symmetrically arranged on the reflected light path and transmitted light path of the beam splitter (4). The output end of the signal acquisition module (7) is connected to the data processing unit (8) via a ribbon cable. The multi-parameter sensor assembly includes a temperature sensor (11), a concentration sensor (12), and a liquid level sensor (13). The temperature sensor (11) is fixedly installed at the bottom of the interferometer body (1), the concentration sensor (12) is fixedly installed on the side of the interferometer body (1), and the liquid level sensor (13) is fixedly installed at the top of the interferometer body (1).

2. The multi-parameter liquid detection experimental device based on a Michelson interferometer according to claim 1, characterized in that, The sliding bracket (2) has limit grooves (15) on both sides. The width of the limit grooves (15) is 10mm and the depth is 5mm. The top of the sliding bracket (2) has a mounting hole with a diameter of 6mm. The bottom of the beam splitter mount (3) is provided with a positioning pin (16) with a diameter of 5mm and a length of 10mm. The positioning pin (16) is inserted into the mounting hole and fixed by a nut.

3. The multi-parameter liquid detection experimental device based on a Michelson interferometer according to claim 1, characterized in that, The housing of the broadband light source (5) is made of stainless steel and has a thickness of 2mm. A filter is provided at the light outlet of the broadband light source (5) and has a thickness of 1mm. The filter is connected to the housing of the broadband light source (5) by two clips.

4. The multi-parameter liquid detection experimental device based on a Michelson interferometer according to claim 1, characterized in that, The photodetector (6) is connected to the interferometer body (1) through a mounting bracket. The bottom of the mounting bracket has a positioning hole with a rubber gasket embedded in it. The top of the mounting bracket has two adjustment knobs with a thread diameter of 4 mm and a pitch of 0.75 mm.

5. The multi-parameter liquid detection experimental device based on a Michelson interferometer according to claim 1, characterized in that, The core component of the data processing unit (8) is an embedded processor (9). The embedded processor (9) is fixed on the circuit board by soldering. Heat sink fins (10) are provided around the circuit board. The height of the heat sink fins (10) is 10mm. The embedded processor (9) communicates with the signal acquisition module (7) through the SPI interface. The sampling frequency is set to 2kHz.

6. The multi-parameter liquid detection experimental device based on a Michelson interferometer according to claim 1, characterized in that, The probe of the temperature sensor (11) passes through the bottom panel of the interferometer body (1). The probe and the bottom panel are sealed by a sealing ring. The probe of the temperature sensor (11) is made of platinum resistance material. The diameter of the probe is 2 mm and the length is 10 mm. The signal output end of the temperature sensor (11) is connected to the data processing unit (8) through a shielded wire.

7. The multi-parameter liquid detection experimental device based on a Michelson interferometer according to claim 1, characterized in that, The sensing end of the concentration sensor (12) is in contact with the liquid. The surface of the sensing end is coated with a corrosion-resistant coating. The diameter of the sensing end is 3 mm and the length is 15 mm. The signal output end of the concentration sensor (12) is connected to the data processing unit (8) by a plug-in method. The number of plug-in terminals is three.

8. The multi-parameter liquid detection experimental device based on a Michelson interferometer according to claim 1, characterized in that, The sensing end of the liquid level sensor (13) is connected to the liquid container through a conduit with an inner diameter of 3 mm, a sensing end with a diameter of 4 mm and a length of 20 mm. The signal output end of the liquid level sensor (13) is fixed to the conduit through a threaded connection with a thread diameter of 5 mm and a pitch of 1 mm.

9. The multi-parameter liquid detection experimental device based on a Michelson interferometer according to claim 1, characterized in that, The bottom of the interferometer body (1) is provided with four support feet (14). The support feet (14) are evenly distributed at the four corners of the interferometer body (1). Each support foot (14) has an anti-slip pad embedded at its bottom. The thickness of the anti-slip pad is 5mm. The top of the support foot (14) is connected to the interferometer body (1) by a thread. The diameter of the thread is 8mm and the pitch is 1.5mm.

10. The multi-parameter liquid detection experimental device based on a Michelson interferometer according to claim 1, characterized in that, The cable length between the signal acquisition module (7) and the data processing unit (8) is 50cm. The outer shell of the data processing unit (8) is made of aluminum alloy and the surface of the outer shell is anodized.

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