CN219200608U - System for measuring sound velocity temperature coefficient of liquid - Google Patents
System for measuring sound velocity temperature coefficient of liquid Download PDFInfo
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- CN219200608U CN219200608U CN202221718183.7U CN202221718183U CN219200608U CN 219200608 U CN219200608 U CN 219200608U CN 202221718183 U CN202221718183 U CN 202221718183U CN 219200608 U CN219200608 U CN 219200608U
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Abstract
One or more embodiments of the present disclosure disclose a system for measuring the sound velocity temperature coefficient of a liquid, in this solution, a temperature control heating device is added on an optical path system, and a target liquid sample in a sample tank thereof is heated and thermostatically controlled by using the temperature control heating device, so that the target liquid sample receives ultrasonic control sent by an ultrasonic transducer of an ultrasonic signal source at a target temperature to form a required ultrasonic grating, and thus, after laser enters the target liquid sample through a slit passing through a light transmission window of the temperature control heating device, the laser exits from a light transmission window at the other side under the action of the ultrasonic grating, and forms diffraction fringes on a light screen through the action of a convex lens, and the sound velocity at the target temperature is determined based on the above sound velocity formula. The above operation is repeated, different target temperatures are regulated, and sound velocity at the different target temperatures is determined, so that a more accurate and reliable sound velocity temperature coefficient of the target liquid sample can be obtained.
Description
Technical Field
The present document relates to the field of parameter measurement technologies, and in particular, to a system for measuring a sound velocity temperature coefficient of a liquid.
Background
The speed of sound, the propagation speed of a mechanical wave in a medium, reflects the transfer and transfer of energy in the medium and is one of the important parameters of the medium's properties. At present, important industrial parameters such as the compression coefficient of a medium and the like can be conveniently obtained through measuring the sound velocity.
The sound velocity measurement method includes echo method, resonance interferometry, phase comparison method, ultrasonic grating method, etc. The magnitude of the speed of sound in a medium is related to its temperature and therefore it is important for a transmission medium, especially a liquid medium, to know the relationship between the speed of sound and the temperature in the liquid medium (which can also be defined as the speed of sound temperature coefficient).
However, the measurement method of the parameter of the sound velocity temperature coefficient in the prior art is rarely described.
Disclosure of Invention
It is an object of one or more embodiments of the present specification to provide a system for measuring the sound velocity temperature coefficient of a liquid to accurately measure the sound velocity temperature coefficient of the liquid medium by temperature adjustment of the liquid medium.
To solve the above technical problems, one or more embodiments of the present specification are implemented as follows:
in a first aspect, a system for measuring the sound velocity temperature coefficient of a liquid is provided, comprising:
an optical path system; the laser, the slit, the convex lens, the temperature control heating device and the light screen are sequentially arranged on the light path system; the ultrasonic signal source and the temperature controller are connected with the temperature control heating device;
wherein, the light screen, the temperature control heating device, the convex lens, the slit and the laser have coaxial relation;
the temperature control heating device is provided with a through hole serving as a light transmission window along the extending direction of the light path system, and the center of the light transmission window on any side surface is positioned on the optical axis determined by the coaxial relation; a groove is formed in the temperature control heating device, and the bottom of the groove is not higher than the lowest point of the light-transmitting window; the groove accommodates a transparent sample cell, and the sample cell is used for accommodating a liquid sample to be measured; the temperature control heating device is also provided with a first type connecting hole for accommodating the heating rod, a second type connecting hole for accommodating the temperature sensor and a third type connecting hole for accommodating the ultrasonic transducer; one end of the heating rod and one end of the temperature sensor in the temperature control heating device are respectively connected with the sample tank, the other end of the heating rod and the other end of the temperature sensor are respectively connected with the temperature controller, the heating rod is used for heating a liquid sample in the sample tank according to the regulation and control of the temperature controller, and the temperature sensor is used for measuring the temperature of the liquid sample in the sample tank and feeding back to the temperature controller for regulating and controlling the heating temperature; one end of the ultrasonic transducer in the temperature control heating device is in contact with the liquid sample in the sample tank, the other end of the ultrasonic transducer is connected with the ultrasonic signal source, and the ultrasonic transducer outputs ultrasonic waves to the liquid sample in the sample tank under the regulation and control of the ultrasonic signal source;
after a target liquid sample to be measured is put into the sample pool, the ultrasonic signal source is turned on, and ultrasonic waves are output to the target liquid sample through an ultrasonic transducer on a temperature control heating device connected with the ultrasonic signal source; meanwhile, the temperature controller triggers the heating rod to heat the target liquid sample according to the set target temperature, and after the temperature sensor detects that the target liquid sample reaches the target temperature, the temperature controller indicates the heating rod to stop heating; at the target temperature, the laser is turned on, the positions of the optical instruments on the optical path system are adjusted, laser enters an ultrasonic grating formed by a target liquid sample through the slit and then exits, and the laser is focused by the convex lens and then imaged into diffraction fringes on the optical screen; determining the sound velocity of ultrasonic waves in a target liquid sample at the current temperature based on the distance between a kth-stage stripe and a central bright stripe in the formed diffraction stripes, the distance between an ultrasonic grating and a light screen and the ultrasonic frequency;
obtaining sound velocity determined at different target temperatures by adjusting the target temperatures;
and determining the sound velocity temperature coefficient of the target liquid based on the sound velocities correspondingly determined by different target temperatures.
According to the technical scheme provided by one or more embodiments of the specification, a temperature control heating device is added on a light path system, and a target liquid sample in a sample tank is heated and thermostatically controlled by the temperature control heating device, so that the target liquid sample is subjected to ultrasonic control emitted by an ultrasonic transducer of an ultrasonic signal source at a target temperature to form a required ultrasonic grating, and then laser enters the target liquid sample through a slit passing through a light transmission window of the temperature control heating device, exits from the light transmission window at the other side under the action of the ultrasonic grating, forms diffraction fringes on a light screen under the action of a convex lens, and determines the sound velocity at the target temperature based on the sound velocity formula. The above operation is repeated, different target temperatures are regulated, and sound velocity at the different target temperatures is determined, so that a more accurate and reliable sound velocity temperature coefficient of the target liquid sample can be obtained.
Drawings
For a clearer description of one or more embodiments of the present description or of the solutions of the prior art, reference will be made below to the accompanying drawings, which are used in the description of one or more embodiments or of the prior art, it being obvious that the drawings in the description below are only some of the embodiments described in the present description, and that other drawings may be obtained from these drawings by a person of ordinary skill in the art without the exercise of inventive work.
Fig. 1 is a schematic diagram of a system for measuring the sound velocity temperature coefficient of a liquid according to an embodiment of the present disclosure.
Fig. 2 a-2 b are schematic structural diagrams of a temperature-controlled heating apparatus according to an embodiment of the present disclosure.
Fig. 3 is a schematic diagram of an ultrasonic grating according to an embodiment of the present disclosure.
Fig. 4 is a schematic flow chart of measurement performed by the measurement system of fig. 1 according to the embodiment of the present disclosure.
Detailed Description
In order that those skilled in the art will better understand the technical solutions in this specification, a clear and complete description of the technical solutions in one or more embodiments of this specification will be provided below with reference to the accompanying drawings in one or more embodiments of this specification, and it is apparent that the one or more embodiments described are only a part of embodiments of this specification, not all embodiments. All other embodiments, which can be made by one or more embodiments of the present disclosure without inventive faculty, are intended to be within the scope of the present disclosure.
Referring to fig. 1, a schematic structural diagram of a system for measuring a sound velocity temperature coefficient of a liquid according to an embodiment of the present disclosure is shown, where the system may include: an optical path system 101; the laser 106, the slit 105, the convex lens 103, the temperature control heating device 104 and the light screen 102 are sequentially arranged on the light path system 101; and an ultrasonic signal source 107 and a temperature controller 108 connected to the temperature-controlled heating device 104;
wherein, the light screen 102, the temperature-controlled heating device 104, the convex lens 103, the slit 105 and the laser 106 are arranged in a coaxial relationship, for example, the centers of all the elements in a two-dimensional optical path system are positioned on the same specific optical axis, thus facilitating the transmission of subsequent light rays and forming diffraction fringes on the light screen 102.
As shown in fig. 2 a-2 b, the temperature-controlled heating device 104 is provided with a through hole as a light-transmitting window 1041 along the extending direction of the optical path system 101, and the center of the light-transmitting window 1041 on either side is located on the optical axis defined by the coaxial guangxi. A groove a is arranged in the temperature-controlled heating device 104, and the bottom of the groove a is not higher than the lowest point of the light-transmitting window 1041; the groove a accommodates a transparent sample cell 1042, and the sample cell 1042 is used for accommodating a liquid sample to be measured, so that the laser transmitted through the light-transmitting window 1041 can enter the liquid sample in the sample cell 1042 and exit through an ultrasonic grating formed by the liquid sample.
The temperature-controlled heating device 104 is further provided with a first type connecting hole K1 for accommodating the heating rod 1043, a second type connecting hole K2 for accommodating the temperature sensor 1044, and a third type connecting hole K3 for accommodating the ultrasonic transducer 1045; one end of the heating rod 1043 and one end of the temperature sensor 1044 inside the temperature-controlled heating device 104 are respectively connected with the sample cell 1042, the other end of the heating rod 1043 and the other end of the temperature sensor 1044 are respectively connected with the temperature controller 108, the heating rod 1043 is used for heating the liquid sample in the sample cell 1042 according to the regulation of the temperature controller 108, and the temperature sensor 1044 is used for measuring the temperature of the liquid sample in the sample cell 1042 and feeding back to the temperature controller 108 to regulate the heating temperature; one end of the ultrasonic transducer 1045 in the temperature control heating device 104 is in contact with the sample cell 1042, the other end of the ultrasonic transducer 1045 is connected with the ultrasonic signal source 107, and the ultrasonic transducer 1045 outputs ultrasonic waves to the liquid sample in the sample cell 1042 under the control of the ultrasonic signal source 107.
After a target liquid sample to be measured is placed in the sample cell 1042, the ultrasonic signal source 107 is turned on, and ultrasonic waves are output to the target liquid sample through an ultrasonic transducer 1045 on the temperature control heating device 104 connected with the ultrasonic signal source; meanwhile, the temperature controller 108 triggers the heating rod 1043 to heat the target liquid sample according to the set target temperature, and after the temperature sensor 1044 detects that the target liquid sample reaches the target temperature, the temperature controller 108 instructs the heating rod 1043 to stop heating; at the target temperature, the laser 106 is turned on, the positions of the optical instruments on the optical path system 101 are adjusted, laser enters an ultrasonic grating formed by a target liquid sample through the slit 105 and then exits, and after being condensed by the convex lens 103, the laser is imaged as diffraction fringes on the light screen 102.
Then, determining the sound velocity of the ultrasonic wave in the target liquid sample at the current temperature based on the distance between the kth-stage stripe and the central bright stripe in the formed diffraction stripes, the distance between the ultrasonic grating and the light screen and the ultrasonic frequency; obtaining sound velocity determined at different target temperatures by adjusting the target temperatures; and determining the sound velocity temperature coefficient of the target liquid based on the sound velocities correspondingly determined by different target temperatures. Wherein the sound velocity temperature coefficient may be a sound velocity temperature curve formed by different sound velocities at different temperatures. Alternatively, the sonic temperature coefficient may be a value or range of values determined over a range of temperatures or sonic speeds.
It should be understood that the sound speed measurement scheme used in the present application is: an ultrasonic grating method; the principle of ultrasonic grating sound velocity measurement is as follows: when ultrasonic waves propagate in the liquid, referring to fig. 3, the sound waves propagate to the other end of the sample cell and are reflected, the reflected sound waves and the incident sound waves are superposed in the liquid in the sample cell to form standing waves, the standing waves enable the density of the liquid to form periodic distribution along the propagation direction of the sound waves, and the periodic distribution of the density of the liquid causes the refractive indexes of different positions of the liquid to present periodic distribution, so that a grating structure is formed.
As can be seen from optical theory, when parallel light with wavelength lambda passes through a grating with grating constant (a+b), the diffraction angle of k-level bright fringes is equal to that of the grating
Satisfy the following requirements
For an ultrasonic grating, its grating constant is equal to the ultrasonic wavelength Λ, so the formula (2-1) can be written as
Let the distance between the k-order diffraction fringe and the central bright fringe be d k The distance from the ultrasonic grating to the light screen is D, and the diffraction angle is used for
Extremely small and thus can be approximated byThought to be that
The ultrasonic wave propagation velocity v=fΛ is obtained by substituting the formulas (2-2) and (2-3) into the formula (2-1)
Wherein d k The distance between the k-order diffraction fringes and the central bright fringes, the distance between the grating and the light screen, the ultrasonic frequency f and the laser wavelength lambda.
In addition, it should be noted that, an ultrasonic coupling agent needs to be smeared between the ultrasonic transducer and the sample cell in advance, so as to avoid that an air layer is generated between the ultrasonic transducer and the sample cell to cause strong reflection on ultrasonic waves, and further, the ultrasonic waves cannot enter the sample cell.
According to the technical scheme, the temperature control heating device is added on the light path system, the temperature control heating device is utilized to heat and control the target liquid sample in the sample tank at constant temperature, so that the target liquid sample is subjected to ultrasonic control emitted by the ultrasonic transducer of the ultrasonic signal source at the target temperature to form the required ultrasonic grating, and therefore, after laser enters the target liquid sample through the slit through the light transmission window of the temperature control heating device, the laser exits from the light transmission window at the other side under the action of the ultrasonic grating, diffraction fringes are formed on the light screen through the action of the convex lens, and the sound velocity at the target temperature is determined based on the sound velocity formula. The above operation is repeated, different target temperatures are regulated, and sound velocity at the different target temperatures is determined, so that a more accurate and reliable sound velocity temperature coefficient of the target liquid sample can be obtained.
Optionally, at least one first-type connecting hole is arranged, and each first-type connecting hole is embedded with a heating rod; and/or; at least one of the second type connecting hole and the third type connecting hole is respectively arranged, a temperature sensor is embedded in the second type connecting hole, and an ultrasonic transducer is embedded in the third type connecting hole. In fact, in the embodiment of the present specification, the number of heating rods is not limited, and the at least one heating rod may be disposed to be connected to one side of the sample cell to heat the target liquid sample in the sample cell; of course, two or more first type connecting holes may be provided and heating rods may be inserted into each of the first type connecting holes, as the size and the position allow, so that the heating rods are symmetrically provided and connected to one side or both sides of the sample cell to uniformly heat the target liquid sample in the sample cell. The detection chip of the temperature sensor can be arranged inside the sample cell and directly contacts with the temperature change of the detection target liquid sample. The ultrasonic transducer may be disposed at the bottom of the sample cell, i.e., ultrasonic signals are emitted from the bottom of the sample cell; alternatively, the ultrasonic transducer is used as the bottom of the sample cell to emit ultrasonic signals.
Optionally, the first type of connection holes and the second type of connection holes are arranged on the same side, and the third type of connection holes are arranged on a measuring surface opposite to the side where the first type of connection holes are arranged; the embedded heating rod, the temperature sensor and the ultrasonic transducer in the temperature control heating device are all prevented from being opened to serve as a through hole of the light transmission window. Therefore, laser passing through the light transmission window is not affected by shielding of at least one of the embedded heating rod, the temperature sensor and the ultrasonic transducer, and diffraction fringe imaging on the side light screen is facilitated to be better achieved.
Optionally, the material of the external main body structure of the temperature control heating device is a heat insulation material; or, the external main body structure of the temperature control heating device is wrapped with a heat insulation layer. Therefore, the heating process and the heated temperature maintenance of the target liquid sample in the sample tank are realized through a semi-wrapping mode of the heat insulation material or the heat insulation layer, the target temperature is prevented from being far away from due to too fast heat dissipation, and further, the accuracy of sound velocity measurement and the accuracy of sound velocity temperature coefficient are improved.
Optionally, the temperature controller is a temperature controller with a built-in micro-processing chip; the temperature controller is also provided with a display screen, and the display screen is provided with the following distinguishing displays: a set target temperature and a real-time temperature of the target liquid sample during heating. It should be appreciated that the temperature controller may also be provided with various types of buttons or switches to facilitate flexible adjustment of the target temperature. The temperature controller is connected with the heating rod and the temperature sensor through wires or signal wires respectively, wherein the heating rod can be a metal resistor, and generates heat after being electrified through the wires so as to heat a target liquid sample in the sample cell; the temperature sensor can be a temperature detection chip, and a detected temperature signal is transmitted to the temperature controller through a signal wire to realize temperature regulation.
Optionally, the system further comprises: a sound velocity measuring instrument; the sound velocity measuring instrument determines the distance from the ultrasonic grating to the light screen based on the position coordinates of the ultrasonic grating on the light path and the position coordinates of the light screen on the light path; and receiving the distance between the input kth-stage stripe and the central bright stripe and the ultrasonic frequency; calculating the sound velocity of the ultrasonic wave in the target liquid sample at the current temperature by adopting the following formula;
wherein d k The distance between the k-order diffraction fringes and the central bright fringes, the distance between the grating and the light screen, the ultrasonic frequency f and the laser wavelength lambda. It should be understood that in the embodiment of the present disclosure, the distance between the kth level stripe and the central bright stripe may be measured manually by a tool ruler with higher precision, or automatically by a similar precision instrument.
Optionally, the system further comprises: a sound velocity temperature coefficient measuring instrument; the sound velocity temperature coefficient measuring instrument draws a sound velocity temperature coefficient curve of the target liquid based on sound velocities correspondingly determined by different target temperatures. The sound velocity temperature coefficient measuring instrument can automatically acquire or receive a plurality of target temperature information and sound velocity information corresponding to each target temperature information, automatically draw a sound velocity temperature coefficient curve and display the sound velocity temperature coefficient curve on a corresponding screen.
It should be understood that the optical path system shown in fig. 1 may be a one-dimensional optical path or a two-dimensional optical path or a three-dimensional optical path; for example, a one-dimensional optical path may be specifically constructed by an optical bench, and accordingly, the optical bench may be regarded as the optical path system shown in fig. 1; for another example, a relatively complex optical path system can be built by an instrument such as a spectrometer.
A flow of measurement using the measurement system of fig. 1 described above will be described with reference to fig. 4.
Step 401: the laser, the slit, the convex lens, the temperature control heating device and the light screen are sequentially arranged on the light path system according to a preset sequence.
Step 402: the heights of the above instruments in the light path system are adjusted to make the laser, the slit, the convex lens, the temperature control heating device and the light screen have coaxial relation.
Step 403: and injecting a sufficient amount of target liquid sample to be measured into a sample pool of the temperature-controlled heating device.
Step 404: and opening an ultrasonic signal source, and outputting ultrasonic waves to the target liquid sample through an ultrasonic transducer on a temperature control heating device connected with the ultrasonic signal source.
Step 405: and simultaneously, opening a temperature controller, triggering a heating rod of the temperature control heating device to heat the target liquid sample according to the set target temperature, and after the temperature sensor detects that the target liquid sample reaches the target temperature, indicating the heating rod to stop heating by the temperature controller.
Step 406: and at the target temperature, the laser is turned on, the positions of the optical instruments on the optical path system are adjusted, laser enters an ultrasonic grating formed by a target liquid sample through the slit and then exits, and the laser is focused by the convex lens and then imaged into diffraction fringes on the optical screen.
Step 407: and determining the sound velocity of the ultrasonic wave in the target liquid sample at the current temperature based on the distance between the kth-stage stripe and the central bright stripe in the formed diffraction stripes, the distance between the ultrasonic grating and the light screen and the ultrasonic frequency.
Step 408: and obtaining the sound velocity determined at different target temperatures by adjusting the target temperatures.
Step 409: and determining the sound velocity temperature coefficient of the target liquid sample based on the sound velocities correspondingly determined by the different target temperatures.
According to the operation steps, the value of the target temperature can be repeatedly adjusted in a certain temperature interval so as to obtain the sound velocity determined at different target temperatures. Then, the sound velocity temperature coefficient of the target liquid sample is plotted using the plurality of target temperatures and the sound velocity corresponding to each target temperature.
According to the technical scheme, the temperature control heating device is added on the light path system, the temperature control heating device is utilized to heat and control the target liquid sample in the sample tank at constant temperature, so that the target liquid sample is subjected to ultrasonic control emitted by the ultrasonic transducer of the ultrasonic signal source at the target temperature to form the required ultrasonic grating, and therefore, after laser enters the target liquid sample through the slit through the light transmission window of the temperature control heating device, the laser exits from the light transmission window at the other side under the action of the ultrasonic grating, diffraction fringes are formed on the light screen through the action of the convex lens, and the sound velocity at the target temperature is determined based on the sound velocity formula. The above operation is repeated, different target temperatures are regulated, and sound velocity at the different target temperatures is determined, so that a more accurate and reliable sound velocity temperature coefficient of the target liquid sample can be obtained.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for system embodiments, since they are substantially similar to method embodiments, the description is relatively simple, as relevant to see a section of the description of method embodiments.
The foregoing describes specific embodiments of the present disclosure. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims can be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.
Claims (7)
1. A system for measuring the sound velocity temperature coefficient of a liquid, comprising:
an optical path system; the laser, the slit, the convex lens, the temperature control heating device and the light screen are sequentially arranged on the light path system; the ultrasonic signal source and the temperature controller are connected with the temperature control heating device;
wherein, the light screen, the temperature control heating device, the convex lens, the slit and the laser have coaxial relation;
the temperature control heating device is provided with a through hole serving as a light transmission window along the extending direction of the light path system, and the center of the light transmission window on any side surface is positioned on the optical axis determined by the coaxial relation; a groove is formed in the temperature control heating device, and the bottom of the groove is not higher than the lowest point of the light-transmitting window; the groove accommodates a transparent sample cell, and the sample cell is used for accommodating a liquid sample to be measured; the temperature control heating device is also provided with a first type connecting hole for accommodating the heating rod, a second type connecting hole for accommodating the temperature sensor and a third type connecting hole for accommodating the ultrasonic transducer; one end of the heating rod and one end of the temperature sensor in the temperature control heating device are respectively connected with the sample tank, the other end of the heating rod and the other end of the temperature sensor are respectively connected with the temperature controller, the heating rod is used for heating a liquid sample in the sample tank according to the regulation and control of the temperature controller, and the temperature sensor is used for measuring the temperature of the liquid sample in the sample tank and feeding back to the temperature controller for regulating and controlling the heating temperature; one end of the ultrasonic transducer in the temperature control heating device is in contact with the liquid sample in the sample tank, the other end of the ultrasonic transducer is connected with the ultrasonic signal source, and the ultrasonic transducer outputs ultrasonic waves to the liquid sample in the sample tank under the regulation and control of the ultrasonic signal source.
2. The system for measuring the temperature coefficient of sound velocity of a liquid according to claim 1,
at least one first type of connecting hole is arranged, and each first type of connecting hole is embedded with a heating rod;
and/or;
at least one of the second type connecting hole and the third type connecting hole is respectively arranged, a temperature sensor is embedded in the second type connecting hole, and an ultrasonic transducer is embedded in the third type connecting hole.
3. A system for measuring the temperature coefficient of sound velocity of a liquid according to claim 2,
the first type connecting holes and the second type connecting holes are arranged on the same side face, and the third type connecting holes are arranged on the side face opposite to the side face where the first type connecting holes are arranged;
the embedded heating rod, the temperature sensor and the ultrasonic transducer in the temperature control heating device are all prevented from being opened to serve as a through hole of the light transmission window.
4. The system for measuring the temperature coefficient of sound velocity of a liquid according to claim 1,
the external main body structure of the temperature control heating device is made of heat insulation materials; or alternatively, the process may be performed,
the external main body structure of the temperature control heating device is wrapped with a heat insulation layer.
5. The system for measuring the temperature coefficient of sound velocity of a liquid according to claim 1,
the temperature controller is a temperature controller with a built-in micro-processing chip;
the temperature controller is also provided with a display screen, and the display screen is provided with the following distinguishing displays: a set target temperature and a real-time temperature of the target liquid sample during heating.
6. The system for measuring the sound velocity temperature coefficient of a liquid of claim 1, further comprising: a sound velocity meter for calculating a sound velocity of the ultrasonic wave in the target liquid sample at the current temperature; the sound velocity measuring instrument calculates the sound velocity by adopting the following formula;
wherein d k The distance between the k-order diffraction fringes and the central bright fringes, the distance between the grating and the light screen, the ultrasonic frequency f and the laser wavelength lambda.
7. The system for measuring the temperature coefficient of sound velocity of a liquid of claim 6, further comprising: and the sound velocity temperature coefficient measuring instrument is used for drawing a sound velocity temperature coefficient curve of the target liquid based on the sound velocities correspondingly determined by different target temperatures.
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