A calibration method and measuring device for bone conduction transducer output vibration force

Abstract

The application discloses a kind of calibration method and measuring device for bone conduction transducer output vibration force, belong to hearing measurement technical field, the device includes vibration isolation pedestal, switching type load impedance unit, impedance head sensor, static force loading device for providing standard static load and movable positioning restraint mechanism, by at least two different mechanical impedance load conditions, utilize impedance head sensor to obtain vibration force signal and acceleration signal, the output characteristics of bone conduction transducer are characterized, and the reference mechanical impedance load characteristics specified in standard are combined, obtain standard equivalent output force, realize the calibration of the equivalent bone conduction transducer vibration force with current standard, the application can reduce the influence of environmental temperature change and long-term use aging on measurement result, improve the repeatability, stability and consistency of bone conduction transducer calibration, suitable for the calibration scene of bone conduction transducer.

Description

Technical Field

[0001] This invention relates to a measuring device, and more particularly to a calibration method and measuring device for the output vibration force of a bone conduction transducer, belonging to the field of hearing measurement technology. Background Technology

[0002] Bone conduction transducers, also known as bone conduction headphones, are indispensable diagnostic tools in clinical hearing diagnosis, mainly used to determine the bone conduction hearing threshold of subjects.

[0003] During the diagnostic process, a bone conduction transducer is coupled to the mastoid process behind the subject's ear. An audiometer is used to control the bone conduction transducer to output vibrations of a specific frequency and magnitude, thereby diagnosing the subject's bone conduction hearing status.

[0004] Since the test results are highly dependent on the accuracy of the vibration force output by the bone conduction transducer, it is extremely important to accurately measure and calibrate the vibration force of the bone conduction transducer.

[0005] The verification and calibration of the vibration force of audiometers and their associated bone conduction transducers must be carried out in accordance with the requirements of national standards.

[0006] Meanwhile, the standard stipulates that the force coupler used to measure bone transducers, also known as simulated mastoid, should be used as a metrological standard for bone conduction transducers.

[0007] The original design intention of the simulated mastoid is to simulate the mechanical impedance of the human mastoid, so that the output force of the bone conduction transducer coupled to the simulated mastoid is close to the output force coupled to the human mastoid.

[0008] Since the human mastoid process is composed of skin and bone, simulated mastoids also use a combination of viscoelastic and metallic materials to form a multi-layered composite structure.

[0009] Due to the high temperature sensitivity of viscoelastic materials, the standard specifies an operating temperature of 23℃±1℃. However, for every 1℃ deviation of the ambient temperature from the standard condition, the measurement error may reach approximately 0.5dB, limiting its use in non-standard environments.

[0010] Furthermore, the natural aging of viscoelastic materials and fatigue caused by long-term use make the mechanical properties of simulated papillae prone to significant deviation within 5 years, causing them to exceed the tolerance range specified in the standard, and the maintenance cost is extremely high.

[0011] To overcome the shortcomings of traditional simulated mastoids in terms of environmental stability and long-term consistency, researchers at home and abroad have proposed a series of alternative solutions, but these solutions all have insurmountable physical or engineering limitations.

[0012] The voltage correction method measures the voltage output from the audiometer to the bone conduction transducer and calculates it based on a pre-determined empirical force-electric ratio. However, it cannot compensate for individual random deviations of different bone conduction transducers, resulting in poor adaptability to individual differences.

[0013] The acoustic coupling cavity method uses the acoustic radiation signal generated by the bone conduction transducer as a substitute index of vibration force, and couples it to a polymer adapter so that the acoustic signal is transmitted to the microphone for acquisition. However, its environmental stability is not even as good as that of the simulated mastoid process.

[0014] The attached thin-film force sensing measurement method uses a flexible thin-film force sensor directly attached between the bone conduction transducer and the subject's skin to measure the output vibration force of the bone conduction transducer in situ. However, it cannot be separated from the human body to achieve standardized testing, and even a slight change in the sensor's attachment position can significantly affect its measurement results.

[0015] The electrical input impedance analysis method measures the input voltage and current signals of the bone conduction transducer and calculates its mechanical impedance and output vibration force based on the principle of electrical-mechanical analog circuit. However, the measurement results below 300Hz in the low frequency band have large errors and are difficult to use as a calibration method for the entire frequency band.

[0016] Therefore, a new calibration method is needed that has temperature and long-term stability and can adapt to individual differences across the entire frequency band. Summary of the Invention

[0017] The main objective of this invention is to overcome the inherent defects in the current bone conduction transducer calibration system, such as poor environmental stability and poor long-term stability due to the use of viscoelastic materials in the simulated mastoid process. Furthermore, addressing the limitations of existing alternatives reported by researchers both domestically and internationally in terms of implementation conditions, applicable frequency bands, and adaptability to individual differences, this invention provides a method and related measuring device for calibrating the output vibration force of bone conduction transducers based on mechanical impedance measurement. This aims to achieve highly stable, highly repeatable, and individually adaptable vibration force measurement within the standard frequency band without relying on viscoelastic materials, ensuring the equivalence of measurement results with the current hearing metrology system. This invention provides a calibration method and measuring device for the output vibration force of bone conduction transducers.

[0018] The objective of this invention can be achieved by adopting the following technical solution: A calibration method and measuring device for the output vibration force of a bone conduction transducer, including a vibration damping and isolation base for shielding against environmental vibration interference; A vibration isolation platform is installed above the vibration damping and isolation base. A switching load impedance unit is installed on the top of the vibration isolation platform. A transition base is installed on the top of the switching load impedance unit. Separate auxiliary positioning unit sliders are installed on both sides of the transition base. A separate auxiliary positioning unit column is installed through the outer end of the separate auxiliary positioning unit slider. An impedance head sensor is mounted on the axis of the adapter base, a bone conduction transducer is mounted on the upper end of the impedance head sensor, and a movable positioning constraint mechanism is installed through the contact surface between the impedance head sensor and the bone conduction transducer. A flexible element of a static force loading device is installed at the upper end of the bone conduction transducer. This flexible element is mounted on the main body of the static force loading device. An auxiliary guide unit slider is installed through the outer end of the main body of the static force loading device, and a fixed column is installed on the outer side of the auxiliary guide unit slider. Through this overall synergy, the system achieves standardized, high-precision calibration and measurement of the output vibration force of the bone conduction transducer under different load impedances and actual wearing pre-pressure conditions, unifying testing standards and accurately quantifying the transducer's vibration output performance.

[0019] Preferably, the upper middle end of the fixed column is connected to the outside of the movable positioning and constraint mechanism.

[0020] Preferably, the measuring end of the impedance head sensor is in contact with the bone conduction transducer.

[0021] Preferably, the movable positioning constraint mechanism assists in aligning the impedance head sensor and the bone conduction transducer with each other.

[0022] Preferably, the movable positioning constraint mechanism is surrounded by positioning claws, which constrain the impedance head sensor and the bone conduction transducer. The positioning claws adopt a three-point positioning structure for the impedance head sensor and the bone conduction transducer, and the positioning claws are three V-shaped contact grooves evenly distributed along the circumference. The static force loading device at the top of the bone conduction transducer is used in conjunction with the slider of the auxiliary guide unit.

[0023] Preferably, the flexible element and the main body of the static force loading device are an integrated structure, wherein the flexible element is a flexible structure and the main body is a rigid structure.

[0024] Preferably, the bone conduction transducer to be tested is brought into contact with the impedance head sensor via a coupling medium.

[0025] Preferably, the switching load impedance unit is performed while the bone conduction transducer and the impedance head sensor are in contact.

[0026] Preferably, the calibration measurement includes the following steps: Step 1: The vibration damping and isolation base and the vibration isolation platform are set at the bottom of the device, and a switching load impedance unit is set on top of them. The switching load impedance unit is a replaceable structure during the test and includes at least two switching load impedance units with different impedance characteristics. Step 2: The impedance head sensor is installed on the adapter base via bolts. The adapter base and the mass block are positioned by bolt points. To ensure that the contact status of other positions in the measurement system is not affected during the replacement of the switching load impedance unit, a split auxiliary positioning unit slider is used. Two symmetrical split auxiliary positioning unit sliders are fixed to the side of the adapter base by bolts. The split auxiliary positioning unit slider and the split auxiliary positioning unit column are engaged through through holes. The end face of the split auxiliary positioning unit column is fixed to the vibration isolation platform by bolts. Step 3: During the measurement process, the slider of the separate auxiliary positioning unit does not contact the adapter base. During the load switching process, the two sliders of the separate auxiliary positioning unit are first fixed on the adapter base. Next, remove the bolts between the adapter base and the switching load impedance unit, slightly lift the adapter base and the slider of the separate auxiliary positioning unit, and let the slider of the separate auxiliary positioning unit move upward along the column of the separate auxiliary positioning unit to separate from the current switching load impedance unit; The switching load impedance unit is replaced with a switching load impedance unit with a different impedance characteristic. The slider of the separate auxiliary positioning unit is then moved downward along the column of the separate auxiliary positioning unit so that the adapter base is placed on the newly replaced switching load impedance unit fixed on the vibration isolation platform and fixed. Finally, the slider of the separate auxiliary positioning unit is separated from the adapter base, thereby changing the system load impedance condition without disassembling the impedance head sensor. The impedance head sensor is used to synchronously acquire the force signal and the corresponding vibration acceleration signal acting on it. The measuring end of the impedance head sensor is in contact with the bone conduction transducer. To improve the contact state, a coupling medium can be coated between the two. Before each measurement, the impedance head sensor and the bone conduction transducer are aligned by a movable positioning constraint mechanism. Step 4: Since the diameter of the measuring end plane of the impedance head sensor is the same as the diameter of the output surface of the bone conduction transducer, the movable positioning constraint mechanism adopts a three-point centering fixture with the same working principle as the three-jaw chuck, and constrains the impedance head sensor and the bone conduction transducer through three positioning claws with V-shaped contact grooves distributed at equal intervals around the circumference. Step 5: During the measurement phase, the positioning claw on the movable positioning constraint mechanism is retracted radially outward, without contacting the impedance head sensor and bone conduction transducer, and the movable positioning constraint mechanism is fixed on the fixed column. A static force loading device mass body is set above the bone conduction transducer to provide a standard static load. A static force loading device flexible element is set on the contact surface between the static force loading device mass body and the bone conduction transducer. The mechanical impedance of the static force loading device flexible element must be much lower than the source impedance of the bone conduction transducer and the load impedance of the measurement system at the frequency to be measured. The main body of the static force loading device has a mass of 550g, and the flexible element of the static force loading device can be a rubber ring. Step Six: During the measurement and load switching process, in order to ensure the radial position of the main body of the static force loading device, an auxiliary guide unit slider that does not contact the main body of the static force loading device can be set. The auxiliary guide unit slider is a slider with a through hole. The inner diameter of the through hole of the slider is larger than the outer diameter of the main body of the static force loading device. The two are concentric and do not contact each other. The auxiliary guide unit slider can be fixed to the fixed column. Step 7: When measuring the vibration force of the bone conduction transducer, connect the bone conduction transducer to be tested to the audiometer host, and apply a certain electrical drive signal to the bone conduction transducer through the audiometer host to generate vibration force. The bone conduction transducer vibration force calibration measurement includes the force accuracy and total harmonic distortion in the frequency range of 250Hz-8kHz, and specifies the audiometer setting for each measurement.

[0027] Beneficial technical effects of the present invention: This invention provides a calibration method and measuring device for the output vibration force of a bone conduction transducer. With better environmental adaptability and stability, the core components of the measurement system are made of high-rigidity, low-temperature drift materials such as metals and ceramics, which significantly reduces environmental instability and long-term instability compared to the viscoelastic materials used in traditional simulated papillae.

[0028] The measurement repeatability and consistency are better. By designing the mechanism of the switchable load impedance unit that keeps the bone conduction transducer and the measurement sensor in contact, as well as the positioning constraint design of the contact between the two, the repeatability and consistency of the contact state during multiple measurements are improved, and the random measurement error caused by repeated clamping, contact position or state changes is significantly reduced.

[0029] It has better individual adaptability and low-frequency applicability. By directly measuring the mechanical impedance, the characteristic parameters of the bone conduction transducer can be obtained. This method can not only compensate for the characteristic deviations of different bone conduction transducers in real time, but also avoid dependence on electro-mechanical relationships, thus significantly improving the adaptability of the method. Attached Figure Description

[0030] Figure 1 This is an exploded perspective view of a preferred embodiment of a calibration method and measuring device for the output vibration force of a bone conduction transducer according to the present invention. Figure 2 This is a perspective side view of a preferred embodiment of a calibration method and measuring device for the output vibration force of a bone conduction transducer according to the present invention; Figure 3 This is a three-dimensional bottom view of a preferred embodiment of a calibration method and measuring device for the output vibration force of a bone conduction transducer according to the present invention; Figure 4 This is a schematic diagram of the equipment flow structure of a preferred embodiment of a calibration method and measuring device for the output vibration force of a bone conduction transducer according to the present invention.

[0031] In the diagram: 1. Vibration damping and isolation base; 2. Vibration isolation platform; 3. Switchable load impedance unit; 4. Separable auxiliary positioning unit column; 5. Separable auxiliary positioning unit slider; 6. Adapter base; 7. Impedance head sensor; 8. Movable positioning constraint mechanism; 9. Bone conduction transducer; 10. Flexible element of static force loading device; 11. Mass body of static force loading device; 12. Auxiliary guide unit slider; 13. Fixed column. Detailed Implementation

[0032] To enable those skilled in the art to understand the technical solution of the present invention more clearly, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0033] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, this embodiment provides a calibration method and measuring device for the output vibration force of a bone conduction transducer, including a vibration damping and isolation base 1 for shielding environmental vibration interference; A vibration isolation platform 2 is installed above the vibration damping and isolation base 1. A switching load impedance unit 3 is installed on the top of the vibration isolation platform 2. A transition base 6 is installed on the top of the switching load impedance unit 3. Separate auxiliary positioning unit sliders 5 are installed on both sides of the transition base 6. A separate auxiliary positioning unit column 4 is installed through the outer end of the separate auxiliary positioning unit slider 5. An impedance head sensor 7 is mounted on the axis of the adapter base 6, and a bone conduction transducer 9 is mounted on the upper end of the impedance head sensor 7. A movable positioning constraint mechanism 8 is installed through the contact surface between the impedance head sensor 7 and the bone conduction transducer 9. The upper end of the bone conduction transducer 9 is correspondingly equipped with a flexible element 10 of a static force loading device. The flexible element 10 of the static force loading device is installed on the mass body 11 of the static force loading device. An auxiliary guide unit slider 12 is installed through the outer end of the mass body 11 of the static force loading device. A fixed column 13 is installed on the outer side of the auxiliary guide unit slider 12.

[0034] The upper middle end of the fixed column 13 is connected to the outer side of the movable positioning constraint mechanism 8.

[0035] The measuring end of the impedance head sensor 7 is in contact with the bone conduction transducer 9.

[0036] The movable positioning constraint mechanism 8 assists in aligning the impedance head sensor 7 and the bone conduction transducer 9 with each other.

[0037] The movable positioning constraint mechanism 8 is surrounded by a positioning claw 8.1. The positioning claw 8.1 constrains the impedance head sensor 7 and the bone conduction transducer 9. The positioning claw 8.1 adopts a three-point positioning structure for the impedance head sensor 7 and the bone conduction transducer 9. The positioning claw 8.1 is a structure of three V-shaped contact grooves evenly distributed along the circumference. The static force loading device mass body 11 at the top of the bone conduction transducer 9 is used in conjunction with the auxiliary guide unit slider 12.

[0038] The flexible element 10 and the mass body 11 of the static force loading device are an integrated structure, wherein the flexible element 10 of the static force loading device is a flexible structure and the mass body 11 of the static force loading device is a rigid structure.

[0039] The bone conduction transducer 9 to be tested is brought into contact with the impedance head sensor 7 through a coupling medium.

[0040] The switching load impedance unit 3 is performed while the bone conduction transducer 9 and the impedance head sensor 7 are in contact.

[0041] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the vibration damping and isolation base 1 and the vibration isolation platform 2 are set at the bottom of the device, and a switching load impedance unit 3 is set on top of it. The switching load impedance unit 3 is replaceable during the test and includes at least two switching load impedance units 3 with different impedance characteristics, which are used to form different mechanical impedance load conditions during the measurement process. The mechanical impedance is measured using an impedance head sensor 7. The impedance head sensor 7 is mounted on the adapter base 6 by bolt connection. The adapter base 6 and the switching load impedance unit 3 are positioned by bolt points. In order to ensure that the contact status of other positions of the measurement system is not affected during the replacement of the switching load impedance unit 3, a separate auxiliary positioning unit slider 5 is used. Two symmetrical separate auxiliary positioning unit sliders 5 can be fixed to the side of the adapter base 6 by bolts. The separate auxiliary positioning unit sliders 5 and the separate auxiliary positioning unit column 4 are matched with each other through holes. The end face of the separate auxiliary positioning unit column 4 is fixed to the vibration isolation platform 2 by bolts. During the measurement process, the separate auxiliary positioning unit slider 5 does not contact the adapter base 6. During the load switching process, the two separate auxiliary positioning unit sliders 5 are first fixed to the adapter base 6. Then, the bolts between the adapter base 6 and the switching load impedance unit 3 are removed. The adapter base 6 and the separate auxiliary positioning unit slider 5 are slightly lifted, allowing the separate auxiliary positioning unit slider 5 to move upward along the separate auxiliary positioning unit column 4, separating it from the current switching load impedance unit 3. The switching load impedance unit 3 is then replaced with a switching load impedance unit 3 having a different impedance characteristic. The separate auxiliary positioning unit slider 5 is then moved downward along the separate auxiliary positioning unit column 4, allowing the adapter base 6 to be placed on the newly replaced switching load impedance unit 3 fixed on the vibration isolation platform 2 and fixed. Finally, the separate auxiliary positioning unit slider 5 is separated from the adapter base 6, thereby changing the system load impedance condition without disassembling the impedance head sensor 7. The impedance head sensor 7 is used to synchronously acquire the force signal and the corresponding vibration acceleration signal acting on it. The measuring end of the impedance head sensor 7 is in contact with the bone conduction transducer 9. To improve the contact state, a coupling medium can be coated between the two. Before each measurement, the impedance head sensor 7 and the bone conduction transducer 9 are aligned by the movable positioning constraint mechanism 8. Since the diameter of the measuring end plane of the impedance head sensor 7 is the same as the diameter of the output surface of the bone conduction transducer 9, the movable positioning constraint mechanism 8 adopts a three-point centering clamp with the same working principle as the three-jaw chuck, and constrains the impedance head sensor 7 and the bone conduction transducer 9 by three positioning claws with V-shaped contact grooves distributed at equal intervals around the circumference. During the measurement phase, the positioning claw 8.1 of the movable positioning constraint mechanism 8 is retracted radially outward and does not contact the measurement system. The movable positioning constraint mechanism 8 is fixed to the fixed column 13. A static force loading device mass body 11 is provided above the bone conduction transducer 9 to provide a standard static load. A static force loading device flexible element 10 is provided on the contact surface between the static force loading device mass body 11 and the bone conduction transducer 9. The mechanical impedance of the static force loading device flexible element 10 must be much lower than the source impedance of the bone conduction transducer and the load impedance of the measurement system at the frequency to be measured. The main body 11 of the static force loading device has a mass of 550g, and the flexible element 10 of the static force loading device can be a rubber ring. In order to ensure the radial position of the static force loading device during the measurement and load switching process, an auxiliary guide unit slider 12 that does not contact the mass body 11 of the static force loading device can be set. The auxiliary guide unit slider 12 can be a slider with a through hole. The inner diameter of the through hole of the slider is larger than the outer diameter of the mass body 11 of the static force loading device. The two are concentric and do not contact each other. The auxiliary guide unit slider 12 can be fixed to the fixed column 13. When measuring the vibration force of bone conduction transducer 9, the bone conduction transducer 9 under test is connected to the audiometer host, and a certain electrical drive signal is applied to the bone conduction transducer 9 through the audiometer host to generate vibration force. The vibration force calibration measurement of bone conduction transducer 9 includes the force accuracy and total harmonic distortion in the frequency range of 250Hz-8kHz, and the audiometer setting is specified for each measurement.

[0042] The device of the present invention comprises, from bottom to top: a vibration damping and isolation base 1 for shielding environmental vibration interference, a vibration isolation platform 2 disposed above the vibration damping and isolation base 1, and a switching load impedance unit 3 disposed above the vibration isolation platform 2 for providing at least two measurement system conditions with significant mechanical impedance differences. The adapter base 6, the matching separate auxiliary positioning unit slider 5, and the separate auxiliary positioning unit column 4 are set at the top of the switching load impedance unit 3, and the impedance head sensor 7 for mechanical impedance measurement is fixed on the top of the adapter base 6. The bone conduction transducer 9 under test is in contact with the impedance head sensor 7 through a coupling medium, and the two rely on the movable positioning constraint mechanism 8 to ensure the concentricity of the contact. The flexible element 10 of the static force loading device at the top of the bone conduction transducer 9, the main body 11 of the static force loading device, and the matching non-contact auxiliary guide unit slider 12; Under the condition of the switching load impedance unit 3, the bone conduction transducer 9 to be tested is brought into contact with the impedance head sensor 7 through the coupling medium, and is loaded by the mass body 11 of the static force loading device and the flexible element 10 of the static force loading device. Then, the contact concentricity is ensured by the movable positioning constraint mechanism 8. The audiometer was set to the settings for measuring the accuracy of the vibration force of the bone conduction transducer and the total harmonic distortion. Under each setting, the dynamic force signal and acceleration signal output by the bone conduction transducer 9 were synchronously acquired using the impedance head sensor 7.

[0043] After completing the measurement of one type of switching load impedance unit 3, another type of switching load impedance unit 3 is replaced. During the replacement of the switching load impedance unit 3, the measured bone conduction transducer 9 and the impedance head sensor 7 remain in contact, and the static force loading state remains unchanged. After replacing the switching load impedance unit 3, the contact concentricity was confirmed again using the movable positioning constraint mechanism 8. Then, the above measurement process was repeated using an audiometer. Finally, the data obtained under each condition were calculated and processed. Using the above measurement data, a mechanical response model of the measurement system is established, the mechanical impedance characteristic parameters and output force of the bone conduction transducer 9 are calculated, and based on the reference load mechanical impedance characteristics specified in the current standard, the correspondence between the measurement results and the parameters and variables of the standard measurement is established, so as to realize the function of bone conduction transducer calibration equivalent to the current hearing measurement system.

[0044] The above description is merely a further embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope disclosed in the present invention, based on the technical solution and concept of the present invention, shall fall within the scope of protection of the present invention.

Claims

1. A calibration and measurement device for the output vibration force of a bone conduction transducer, comprising a vibration damping and isolation base (1) for shielding against environmental vibration interference. Its features are: A vibration isolation platform (2) is installed above the vibration isolation base (1). A switching load impedance unit (3) is installed on the top of the vibration isolation platform (2). A transition base (6) is installed on the top of the switching load impedance unit (3). Separate auxiliary positioning unit sliders (5) are installed on both sides of the transition base (6). A separate auxiliary positioning unit column (4) is installed through the outer end of the separate auxiliary positioning unit slider (5). An impedance head sensor (7) is mounted on the axis of the adapter base (6), and a bone conduction transducer (9) is mounted on the upper end of the impedance head sensor (7). A movable positioning constraint mechanism (8) is installed through the contact surface between the impedance head sensor (7) and the bone conduction transducer (9). The upper end of the bone conduction transducer (9) is correspondingly equipped with a flexible element (10) of a static force loading device. The flexible element (10) of the static force loading device is installed on the mass body (11) of the static force loading device. The outer end of the mass body (11) of the static force loading device is installed through an auxiliary guide unit slider (12). A fixed column (13) is installed on the outside of the auxiliary guide unit slider (12).

2. The calibration and measurement device for the output vibration force of a bone conduction transducer according to claim 1, characterized in that: The upper middle end of the fixed column (13) is connected to the outer side of the movable positioning constraint mechanism (8).

3. The calibration and measurement device for the output vibration force of a bone conduction transducer according to claim 2, characterized in that: The measuring end of the impedance head sensor (7) is in contact with the bone conduction transducer (9).

4. The calibration and measurement device for the output vibration force of a bone conduction transducer according to claim 3, characterized in that: The movable positioning constraint mechanism (8) assists the impedance head sensor (7) and the bone conduction transducer (9) in aligning with each other.

5. The calibration and measurement device for the output vibration force of a bone conduction transducer according to claim 4, characterized in that: The movable positioning constraint mechanism (8) is surrounded by a positioning claw (8.1). The positioning claw (8.1) constrains the impedance head sensor (7) and the bone conduction transducer (9). The positioning claw (8.1) adopts a three-point positioning structure for the impedance head sensor (7) and the bone conduction transducer (9). The positioning claw (8.1) is a structure of three V-shaped contact grooves evenly distributed along the circumference. The static force loading device mass body (11) at the top of the bone conduction transducer (9) is used in conjunction with the auxiliary guide unit slider (12).

6. The calibration and measurement device for the output vibration force of a bone conduction transducer according to claim 1, characterized in that: The flexible element (10) and the mass body (11) of the static force loading device are an integrated structure, wherein the flexible element (10) of the static force loading device is a flexible structure and the mass body (11) of the static force loading device is a rigid structure.

7. The calibration and measurement device for the output vibration force of a bone conduction transducer according to claim 5, characterized in that: The bone conduction transducer (9) to be tested is brought into contact with the impedance head sensor (7) through a coupling medium.

8. The calibration and measurement device for the output vibration force of a bone conduction transducer according to claim 7, characterized in that: The switching load impedance unit (3) is performed while the bone conduction transducer (9) and the impedance head sensor (7) are in contact.

9. The calibration and measurement device for the output vibration force of a bone conduction transducer according to any one of claims 1-8, further comprising a calibration and measurement method, characterized in that: Calibration measurements include the following steps: Step 1: The vibration damping and isolation base (1) and the vibration isolation platform (2) are set at the bottom of the device, and a switching load impedance unit (3) is set on top of it. The switching load impedance unit (3) is a replaceable structure during the test, including at least two switching load impedance units (3) with different impedance characteristics. Step 2: The impedance head sensor (7) is installed on the adapter base (6) by bolt connection. The adapter base (6) and the switching load impedance unit (3) are positioned by bolt points. In order to ensure that the contact status of other positions of the measurement system is not affected during the replacement of the switching load impedance unit (3), a split auxiliary positioning unit slider (5) is used. Two symmetrical split auxiliary positioning unit sliders (5) are fixed to the side of the adapter base (6) by bolts. The split auxiliary positioning unit slider (5) and the split auxiliary positioning unit column (4) are matched by through holes. The end face of the split auxiliary positioning unit column (4) is fixed to the vibration isolation platform (2) by bolts. Step 3: During the measurement process, the separate auxiliary positioning unit slider (5) does not contact the adapter base (6). During the load switching process, the two separate auxiliary positioning unit sliders (5) are first fixed on the adapter base (6). Remove the bolts between the adapter base (6) and the switching load impedance unit (3), slightly lift the adapter base (6) and the slider (5) of the separate auxiliary positioning unit, and let the slider (5) of the separate auxiliary positioning unit move upward along the column (4) of the separate auxiliary positioning unit to separate from the current switching load impedance unit (3). The switching load impedance unit (3) is replaced with a switching load impedance unit (3) with another impedance characteristic. The slider (5) of the separate auxiliary positioning unit is moved downward along the column (4) of the separate auxiliary positioning unit so that the adapter base (6) is placed on the new switching load impedance unit (3) fixed on the vibration isolation platform (2) and fixed. Finally, the slider (5) of the split auxiliary positioning unit is separated from the adapter base (6), thereby changing the system load impedance condition without disassembling the impedance head sensor (7). The impedance head sensor (7) is used to synchronously collect the force signal and the corresponding vibration acceleration signal acting on it. The measuring end of the impedance head sensor (7) is in contact with the bone conduction transducer (9). To improve the contact state, a coupling medium can be coated between the two. Before each measurement, the impedance head sensor (7) and the bone conduction transducer (9) are aligned by the movable positioning constraint mechanism (8). Step 4: Since the diameter of the measuring end plane of the impedance head sensor (7) is the same as the diameter of the output surface of the bone conduction transducer (9), the movable positioning constraint mechanism (8) adopts a three-point centering clamp with the same working principle as the three-jaw chuck, and constrains the impedance head sensor (7) and the bone conduction transducer (9) by three positioning claws with V-shaped contact grooves distributed at equal intervals around the circumference. Step 5: During the measurement phase, the positioning claw (8.1) on the movable positioning constraint mechanism (8) is radially withdrawn outward and does not contact the impedance head sensor (7) and the bone conduction transducer (9). The movable positioning constraint mechanism (8) is fixed on the fixed column (13). A static force loading device mass body (11) is provided above the bone conduction transducer (9) to provide a standard static load. A static force loading device flexible element (10) is provided on the contact surface between the static force loading device mass body (11) and the bone conduction transducer (9). The mechanical impedance of the static force loading device flexible element (10) must be much lower than the source impedance of the bone conduction transducer (9) and the load impedance of the measurement system at the frequency to be measured. The mass of the main body (11) of the static force loading device is 550g, and the flexible element (10) of the static force loading device can be a rubber ring; Step 6: During the measurement and load switching process, in order to ensure the radial position of the main body (11) of the static force loading device, an auxiliary guide unit slider (12) that does not contact the main body (11) of the static force loading device can be set. The auxiliary guide unit slider (12) is a slider with a through hole. The inner diameter of the through hole of the slider is larger than the outer diameter of the main body (11) of the static force loading device. The two are concentric and do not contact each other. The auxiliary guide unit slider (12) can be fixed to the fixed column (13). Step 7: When measuring the vibration force of the bone conduction transducer (9), connect the bone conduction transducer (9) to be tested to the audiometer host, and apply a certain electrical drive signal to the bone conduction transducer (9) through the audiometer host to generate vibration force. The vibration force calibration measurement of the bone conduction transducer (9) includes the force accuracy and total harmonic distortion in the frequency range of 250Hz-8kHz, and specifies the audiometer setting for each measurement.

Images