阅读说明：本技术 一种用于小尺寸骨材料超声共振谱的测试装置 (Testing device for ultrasonic resonance spectrum of small-size bone material ) 是由 樊璠 牛海军 徐连胜 于 2021-08-11 设计创作，主要内容包括：超声共振谱作为一种利用超声激励样本产生自由振动反演材料力学特性的无损方案,近年来已被应用于小尺寸骨材料弹性性质测量中。超声共振谱测试过程需要保证待测样本不受测试装置干扰,在特定的放置角度下处于最为接近自由表面边界条件的自由振动状态,故超声共振谱测试对样本放置平台和夹持装置的设计提出了较高要求。本发明设计了一种用于小尺寸骨材料超声共振谱的测试装置,主要用于小尺寸骨材料的共振谱测量,具体涉及生物医学电子技术领域,包括：测试架和一组轻质剪切波超声探头；本发明可用于超声共振谱测试中小尺寸骨材料样本的夹持,减小测试装置对样本的影响,为小尺寸骨材料力学性能的精确测量提供了样本测试装置。(Ultrasonic resonance spectroscopy has been applied in recent years to elastic property measurement of small-sized bone materials as a non-destructive solution for inverting the mechanical properties of materials by generating free vibration by using an ultrasonic excitation sample. In the ultrasonic resonance spectrum testing process, the sample to be tested needs to be ensured not to be interfered by the testing device, and the sample to be tested is in a free vibration state which is closest to the boundary condition of the free surface under a specific placing angle, so that the ultrasonic resonance spectrum testing has higher requirements on the design of a sample placing platform and a clamping device. The invention designs a testing device for ultrasonic resonance spectrum of small-size bone material, which is mainly used for resonance spectrum measurement of the small-size bone material, in particular to the technical field of biomedical electronics, and comprises the following components: the test jig comprises a test jig and a group of light shear wave ultrasonic probes; the clamping device can be used for clamping small-size bone material samples in ultrasonic resonance spectrum testing, reduces the influence of the testing device on the samples, and provides a sample testing device for accurate measurement of mechanical properties of the small-size bone material.)

1. A small-size bone material testing device based on ultrasonic resonance spectroscopy is characterized by comprising:

the test jig is used for mounting the ultrasonic probe and a sample to be tested;

the first ultrasonic probe is used for exciting the bone material sample to generate vibration;

the second ultrasonic probe is used for receiving the resonance frequency response of the sample to be detected;

the shell is used for eliminating the adverse effect of air flow in the environment on the experiment;

the vibration isolation platform is used for eliminating the influence of the vibration of the experiment table;

wherein:

the test jig is provided with a vertically placed cylindrical slideway, the inner wall of the cylindrical slideway is smooth, the inner diameter of the cylindrical slideway is slightly larger than the outer diameter of the first ultrasonic probe, and the first ultrasonic probe can freely slide in the slideway;

the bottom plate of the test frame is provided with a groove, and the second ultrasonic probe is arranged in the groove;

the vibration surfaces of the first ultrasonic probe and the second ultrasonic probe are oppositely arranged;

the sample to be detected is placed between the first ultrasonic probe and the second ultrasonic probe, and the first ultrasonic probe is contacted with the sample to be detected under the action of self gravity.

2. The apparatus for testing ultrasonic resonance spectrum of small-sized bone material according to claim 1, wherein:

the shell is made of transparent materials so as to be convenient for observing the state of a sample to be detected;

the test frame is arranged in the shell to isolate the influence of air flow in the environment on the resonance of the sample to be tested.

3. The apparatus for testing ultrasonic resonance spectrum of small-sized bone material according to claim 1, wherein:

the lower part of the shell is provided with a through hole for leading out two ultrasonic probe cables;

the sample to be detected is diagonally placed between the first ultrasonic probe and the second ultrasonic probe;

the vibration isolation platform is an air flotation vibration isolation platform, and the test jig is arranged on the vibration isolation platform, so that the influence of the vibration of the experiment table on the resonance of the small-size bone material sample to be tested is reduced.

4. The apparatus for testing ultrasonic resonance spectrum of small-sized bone material according to claim 1, wherein:

the ultrasonic probe is a light shear wave probe;

the sample is small-sized bone material.

5. The apparatus for testing ultrasonic resonance spectrum of small-sized bone material according to claim 1, wherein:

a square notch is formed in the side face of the slideway, and an electric connecting wire of the first ultrasonic probe extends out of the notch;

the second ultrasonic probe is locked in the groove through a screw.

6. The apparatus for testing ultrasonic resonance spectrum of small-sized bone material according to claim 1, wherein:

the axial line of the slideway is superposed with the central normal lines of the vibration surfaces of the first ultrasonic probe and the second ultrasonic probe.

7. The testing method based on the testing device for ultrasonic resonance spectroscopy of small-sized bone materials according to claims 1 to 6, characterized by comprising the steps of:

vertically fixing a bottom plate (101) and a vertical arm (103) of the test frame (1);

placing the test frame (1) above the vibration isolation platform (6);

then, the vibration surface of the second ultrasonic probe (2) is upwards arranged in a central groove (102) of the bottom plate (101) and locked;

placing a sample (4) to be detected in the center of the vibration surface of the second ultrasonic probe (2);

the first ultrasonic probe (3) slides downwards in the slideway (104) under the action of self gravity, contacts with a sample (4) to be detected and clamps the sample to be detected together with the second ultrasonic probe (2);

then, the power supply (201 and 301) is turned on, an ultrasonic signal is input, the sample to be measured is freely resonated to the maximum extent, and the resonant frequency of the sample to be measured is measured.

Technical Field

The invention relates to a testing device for ultrasonic resonance spectrum of small-size bone materials.

Background

The accurate measurement of the mechanical properties of the bone tissues has important significance for understanding the bone functions, disclosing the mechanism and designing, preparing and evaluating the implanted bone prosthesis.

Due to the high hardness, large brittleness, small size and difficult sampling of bone tissue materials, the existing mechanical testing method has the defects of poor consistency and poor repeatability of testing results, mostly has destructive measurement and can not clamp small-size samples. Compared with the existing mechanical testing method, the ultrasonic resonance spectrum has the advantages of being capable of realizing nondestructive measurement, not limited by sample size, capable of obtaining all elastic constants through single measurement, highly repeatable in result and the like, and is widely applied to mechanical property testing of metal or crystal materials. The specific operation steps of the ultrasonic resonance spectrum method are as follows: firstly, exciting a sample to be tested to generate resonance by ultrasonic, receiving a sample resonance frequency response and extracting the sample ultrasonic resonance spectrum experiment resonance frequency; and then establishing a theoretical model, obtaining the theoretical resonance frequency of the sample, and finally combining the obtained experiment with the theoretical resonance frequency to reversely deduce the mechanical properties of the sample to be detected, such as an elastic constant and the like. However, for the ultrasonic resonance spectrum measurement of a small-sized bone material sample, factors such as coupling between an ultrasonic probe and the sample to be measured and external vibration all affect the measurement result of the experimental resonance frequency of the sample, so that the true resonance frequency of the sample cannot be obtained, and further the accurate elastic property of the sample cannot be obtained. Aiming at the problem, the invention provides a testing device for ultrasonic resonance spectrum of small-size bone materials, and provides a platform for accurately measuring and describing mechanical properties of the bone materials.

Disclosure of Invention

Aiming at the problem of inaccurate measuring result caused by the coupling effect of an ultrasonic probe and a sample in an ultrasonic resonance spectrum test, the invention aims to provide the test device for the ultrasonic resonance spectrum of the small-size bone material sample, which can ensure that the sample to be tested is not interfered by the test device and is in a free vibration state which is closest to the boundary condition of a free surface under a specific placing angle, thereby realizing the accurate measurement of the resonance frequency of the sample. It includes: the test jig is used for mounting the ultrasonic probe and a sample to be tested; the first ultrasonic probe is used for exciting the bone material sample to generate vibration; the second ultrasonic probe is used for receiving the resonance frequency response of the bone material sample to be detected; the shell is used for eliminating the adverse effect of air flow in the environment on the experiment; the vibration isolation platform is used for reducing the influence of the vibration of the experiment table on the resonance of the small-size bone material sample to be detected;

wherein:

the test frame comprises a bottom plate and a vertical arm which is perpendicular to the bottom plate, and a cylindrical slide way is arranged in parallel with the vertical arm and used for mounting the first ultrasonic probe and the second ultrasonic probe;

a groove is formed in the center of the bottom plate, and the second ultrasonic probe can be embedded into the groove and locked through a screw;

the inner wall of the slideway is smooth, the inner diameter of the slideway is slightly larger than the outer diameter of the first ultrasonic probe, and the first ultrasonic probe can freely slide in the slideway;

a square notch is formed in the side face of the slideway, and an electric connecting wire of the first ultrasonic probe extends out of the notch; the axial line of the slideway is superposed with the central normal lines of the vibration surfaces of the first ultrasonic probe and the second ultrasonic probe;

the vibration surface of the second ultrasonic probe faces upwards, and the small bone material sample to be detected is arranged on the vibration surface of the second ultrasonic probe; the first ultrasonic probe is contacted with a small-size bone material sample to be detected under the action of self gravity, and the first ultrasonic probe and the second ultrasonic probe clamp the sample to be detected together;

the shell is arranged outside the test rack and used for isolating the influence of air flow in the external environment on the resonance of the sample to be tested; the lower part of the shell is provided with a through hole for leading out an electric connection wire;

the vibration isolation platform is an air flotation vibration isolation platform, and the test jig is arranged on the vibration isolation platform, so that the influence of the vibration of the experiment table on the resonance of the small-size bone material sample to be tested is reduced.

Drawings

FIG. 1 is a schematic diagram of a testing device for ultrasonic resonance spectroscopy of small-sized bone material according to one embodiment of the present invention;

FIG. 2 is a schematic view of a test rack of a test apparatus for ultrasonic resonance spectroscopy of small-sized bone materials according to an embodiment of the present invention;

FIG. 3 is a schematic view of a slide for a small-sized bone material ultrasonic resonance spectroscopy testing apparatus according to one embodiment of the present invention;

FIG. 4 is a flow chart of the operation of a testing device for ultrasonic resonance spectroscopy of small-sized bone material according to an embodiment of the present invention;

reference numerals:

1-test jig, 101-bottom plate, 102-groove, 103-vertical arm, 104-slideway, 105-notch, 106-slideway axis; 2-a second ultrasound probe; 3-a first ultrasound probe; 201/301-electrical connection lines; 4-a sample to be tested; 5-housing, 501-through hole; 6-vibration isolation platform;

Detailed Description

Embodiments of the present invention are described in further detail below with reference to the accompanying drawings.

The invention aims to provide a testing device for an ultrasonic resonance spectrum of a small-size bone material sample, which can ensure that the sample to be tested is not interfered by the testing device and is in a free vibration state closest to the boundary condition of a free surface under a specific placing angle, so that the accurate measurement of the resonance frequency of the sample is realized.

The test device for the ultrasonic resonance spectrum of the small-size bone material sample according to one embodiment of the invention comprises:

the test jig is used for mounting the ultrasonic probe and a sample to be tested;

the first ultrasonic probe is used for exciting the bone material sample to generate vibration;

the second ultrasonic probe is used for acquiring the ultrasonic resonance frequency response of the bone material sample to be detected;

the shell is used for eliminating the adverse effect of air flow in the environment on the experiment;

the vibration isolation platform is used for reducing the influence of the vibration of the experiment table on the resonance of the small-size bone material sample to be detected;

wherein:

the test frame comprises a bottom plate and a vertical arm which is perpendicular to the bottom plate, and a circular slideway which is parallel to the vertical arm is arranged for mounting the first ultrasonic probe and the second ultrasonic probe;

a groove is formed in the center of the bottom plate, and the second ultrasonic probe can be embedded into the groove and locked through a screw;

the inner wall of the slideway is smooth, the inner diameter of the slideway is slightly larger than the outer diameter of the first ultrasonic probe, and the first ultrasonic probe can freely slide in the slideway;

a square notch is formed in the side face of the slideway, and an electric connecting wire of the first ultrasonic probe extends out of the notch; the axial line of the slideway is superposed with the central normal lines of the vibration surfaces of the first ultrasonic probe and the second ultrasonic probe;

the vibration surface of the second ultrasonic probe faces upwards, and the small bone material sample to be detected is arranged on the vibration surface of the second ultrasonic probe; the first ultrasonic probe is contacted with a small-size bone material sample to be detected under the action of self gravity, and the first ultrasonic probe and the second ultrasonic probe clamp the sample to be detected together;

the shell is arranged outside the test rack and used for isolating the influence of air flow in the external environment on the resonance of the sample to be tested; the lower part of the shell is provided with a through hole for leading out an electric connection wire;

the vibration isolation platform is an air flotation vibration isolation platform, and the test jig is arranged on the vibration isolation platform, so that the influence of the vibration of the experiment table on the resonance of the small-size bone material sample to be tested is reduced.

The present invention will be described in detail below with reference to the accompanying drawings and examples.

As shown in fig. 1, the testing device for ultrasonic resonance spectroscopy of small-sized bone materials according to one embodiment of the present invention comprises a housing 5, a vibration isolation platform 6 and a testing jig 1, wherein the testing jig 1 is disposed on the vibration isolation platform 6 and is used for reducing the influence of the vibration of the testing jig on the resonance frequency of a sample 4 to be tested; the test jig 1 and the vibration isolation platform 6 are arranged in the shell 5 together and used for isolating the influence of air flow in the external environment on the resonance of the sample 4 to be tested; as shown in fig. 2, the lower part of the housing 5 is provided with a through hole 501 for leading out the electrical connection lines 201 and 301;

as shown in fig. 1, 2 and 3, the test device for ultrasonic resonance spectroscopy of small-sized bone materials according to one embodiment of the present invention comprises a test frame 1 for mounting a second ultrasonic probe 3 and a slide way 103; the test jig 1 comprises a bottom plate 101 and a vertical arm 103 which is arranged perpendicular to the bottom plate 101; a circular slideway 104 is arranged in parallel with the vertical arm 103 and used for installing the first ultrasonic probe 3;

a groove 102 is formed in the center of the bottom plate 101, and the second ultrasonic probe 2 can be embedded into the groove 102 and locked through a screw;

the inner wall of the slideway 104 is smooth, the inner diameter is slightly larger than the outer diameter of the first ultrasonic probe 3, and the first ultrasonic probe 3 can freely slide in the slideway 104;

a square notch 105 is formed in the side face of the slide way 104, and an electric connecting wire 301 of the first ultrasonic probe 3 extends out of the notch 105; the slide axis 106 is superposed with the normal of the vibration surface center of the first ultrasonic probe 3 and the second ultrasonic probe 2;

the vibration surface of the second ultrasonic probe 2 faces upwards, and the sample 4 to be detected is arranged on the vibration surface of the second ultrasonic probe 2; the first ultrasonic probe 3 is contacted with the sample 4 to be detected under the action of self gravity, and clamps the sample 4 to be detected together with the second ultrasonic probe 2.

As shown in fig. 4, the operation according to one embodiment of the present invention is as follows:

firstly, assembling a test jig 1, and vertically fixing a bottom plate 101 and a vertical arm 103; placing the test jig 1 on the vibration isolation platform 6;

secondly, the vibration surface of the second ultrasonic probe 2 is installed upwards in the central groove 102 of the bottom plate 101 and is locked by screws;

placing a small-size bone material sample 4 to be detected in the center of the vibration surface of the second ultrasonic probe 2;

the first ultrasonic probe 3 slides downwards in the slideway 104 under the action of self gravity, contacts with the sample 4 to be detected, and clamps the sample 4 to be detected together with the second ultrasonic probe 2;

then, the electrical connection lines 201 and 301 are turned on, an ultrasonic signal is input, the sample 4 to be measured is caused to freely resonate at the maximum, and the resonance frequency is measured.

The advantages of the invention include:

1) the invention adopts the light shear wave ultrasonic probe, can ensure that the sample to be tested is not interfered by the testing device and is in a free vibration state which is closest to the boundary condition of the free surface under a specific placing angle.

2) The invention adopts the shell and the vibration isolation platform, thereby reducing the influence of external vibration on the resonant frequency of the sample to be tested.