CN217770365U - Measuring assembly and measuring system - Google Patents
Measuring assembly and measuring system Download PDFInfo
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- CN217770365U CN217770365U CN202121904351.7U CN202121904351U CN217770365U CN 217770365 U CN217770365 U CN 217770365U CN 202121904351 U CN202121904351 U CN 202121904351U CN 217770365 U CN217770365 U CN 217770365U
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Abstract
The utility model discloses a measuring component and measurement system, this measurement system includes this measuring component, this measuring component sets up first interface and second interface on the top cap of sound-proof tank, first interface passes through the air tightness aviation plug to be sealed, and through the interior microphone that awaits measuring of this air tightness aviation plug connection sound-proof tank's cavity and outside audio frequency tester, realize the collection to the audio data of the microphone that awaits measuring when guaranteeing the sealed of first interface, the second interface of top cap passes through the air duct and connects the vacuum pump, and simultaneously, the upper surface at sound-proof tank's cavity sets up the annular groove around the cavity, and be provided with the sealing washer in this annular groove, guarantee the gas tightness of the composition surface of sound-proof tank's cavity and top cap. The utility model provides a measuring component and measurement system provide give sound insulation cavity can realize the gas tightness simply effectively, and the evacuation is effectual, and vacuum hold time is long, provides convenience for the noise test of microphone.
Description
Technical Field
The utility model relates to a microphone noise test technical field specifically relates to measuring component and measurement system.
Background
Microphones, which are important devices for converting sound signals into electrical signals, have been widely used in various electronic devices such as mobile phones and computers.
SIGNAL-to-NOISE RATIO (SNR) is one of the important performance indicators of a silicon microphone, and NOISE floor is an important parameter for calculating the SNR.
The silicon microphone is generally composed of two chips including a MEMS (Micro-Electro-Mechanical System) chip for sensing environmental sounds and an ASIC (Application Specific Integrated Circuit) chip for receiving an output signal of the MEMS chip and amplifying the output signal. The noise of the silicon microphone mainly comes from superposition of noise of the MEMS chip, the ASIC chip and the packaging structure.
The noise test of the silicon microphone needs to be performed under an absolutely quiet occasion (the ambient noise is less than 20 dB) to eliminate the noise influence caused by the mechanical vibration of the sound in the environment and obtain accurate background noise data, but such test conditions are only provided by a high-end anechoic chamber, and most microphone production and application enterprises do not have such test conditions, so that it is difficult to accurately obtain the background noise parameters of the microphone.
SUMMERY OF THE UTILITY MODEL
In view of the above, it is an object of the present invention to provide a measurement assembly and a test system, thereby facilitating the performance test of a microphone.
According to an aspect of the utility model provides a measuring component for the noise measurement of microphone, include:
the sound insulation tank comprises a cavity and a top cover, the cavity comprises a cavity with an upper opening, the upper surface of the cavity comprises an annular groove surrounding the cavity, the top cover is arranged on the upper surface of the cavity, the position of the top cover corresponding to the opening position of the cavity comprises a first interface and a second interface of a through hole, and the second interface is connected to a vacuum pump through an air duct;
the sealing ring is arranged in an annular groove on the upper surface of the cavity;
the air tightness aviation plug is connected with the first interface of the top cover, and the two ends of the air tightness aviation plug are respectively connected and placed through wires with the microphone to be tested and the audio tester in the cavity of the cavity.
Optionally, the annular groove of the upper surface of the cavity comprises a plurality.
Optionally, the lower surface of the top cover further comprises an annular raised structure opposite the annular groove of the upper surface of the cavity.
Optionally, the method further comprises:
the hasp is arranged on the side wall of the sound insulation tank and connected with the cavity and the top cover.
Optionally, the method further comprises:
and the thread is directly connected with the air duct joint and is used for connecting the air duct with the second interface.
Optionally, the sound-proof tank is an aluminum tank or an aluminum alloy tank.
Optionally, the sealing ring is a silicone ring.
According to the utility model discloses an on the other hand provides a measurement system for the noise measurement of microphone, include the utility model provides a measuring component.
The utility model provides a measuring subassembly sets up first interface and second interface on the top cap of sound-proof tank, first interface passes through the gas tightness aviation plug and seals, and the microphone and the outside audio tester that await measuring in the cavity of connecting sound-proof tank through this gas tightness aviation plug, realize the collection to the audio data of the microphone that awaits measuring in the sealed while of guarantee first interface, the second interface of top cap passes through the air duct and connects the vacuum pump, and simultaneously, the annular groove around the cavity is set up at the upper surface of the cavity of sound-proof tank, and be provided with the sealing washer in this annular groove, the gas tightness of the cavity of guarantee sound-proof tank and the composition surface of top cap, the gas tightness of the syllable-dividing cavity that it provided is good, noise test for the microphone provides convenience.
The utility model provides a measuring system includes the utility model provides a measuring component can provide the reliable test chamber of gas tightness simply, and its evacuation is effectual, and vacuum hold time is long, facilitates for the noise measurement of microphone.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:
fig. 1 shows a schematic partial structural view of a measuring assembly according to an embodiment of the invention;
fig. 2 shows a schematic cross-sectional structure diagram of a partial structure of a measurement assembly according to an embodiment of the present invention.
Detailed Description
Various embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Like elements in the various figures are denoted by the same or similar reference numerals. For purposes of clarity, the various features in the drawings are not necessarily drawn to scale.
The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples.
Fig. 1 shows a partial structure schematic diagram of a measuring assembly according to an embodiment of the present invention, and fig. 2 shows a cross-sectional structure schematic diagram of a partial structure of a measuring assembly according to an embodiment of the present invention.
Referring to fig. 1 and 2, in the measuring assembly 100 of the embodiment of the present invention, the cavity 110 and the top cover 120 constitute a sound-proof tank, the cavity 110 includes an upper open-ended cavity 111 therein, and is used for placing a microphone to be measured, the top cover 120 covers the upper surface of the cavity 110, and seals the cavity 111, the top cover 120 sets a first interface 121 and a second interface 122 of through holes at positions corresponding to the open position of the cavity 111, the first interface 121 is used for connecting an airtight aviation plug 130, and the second interface 122 is connected to a vacuum pump (not shown in the figure) through an air duct (not shown in the figure).
The cavity 111 of the cavity 110 can be used for placing a microphone to be measured only, the size requirement on the cavity 111 is small, the cavity 111 is convenient to be vacuumized quickly, and the measurement efficiency is improved.
Wherein, a first end (in the embodiment, square) of the airtight aviation plug 130 is connected (fixed by screws) to the first interface 121 (in the embodiment, square, in an alternative embodiment, the shape of the first end is the same as that of the airtight aviation plug 130, and the airtight aviation plug is adaptable), wherein the first end of the arranged conducting wire is connected to the microphone to be tested placed in the chamber 111, and the second end of the conducting wire is connected to the audio tester (not shown in the figure), and the first interface 121 is sealed by the airtight aviation plug 130, so as to realize the connection between the audio tester and the microphone to be tested placed in the chamber 111 while ensuring the airtightness of the chamber 111, and to measure and obtain the background noise of the microphone to be tested after the chamber 111 is evacuated through the second interface 122. The noise obtained by testing the microphone to be tested before vacuumizing comprises mechanical noise and background noise of the MEMS chip, and the mechanical noise of the MEMS chip can be obtained through the difference of parameters obtained by measurement before and after vacuumizing.
In this embodiment, three annular grooves 112 are formed in the upper surface of the cavity 110, the three annular grooves 112 are concentric rings surrounding the opening of the cavity 111, and a sealing ring (not shown) is disposed in the annular groove 112, so that when the cavity 110 and the top cover 120 are pressed, the air tightness of the side surface is ensured, and the air tightness requirement of the cavity 111 can be simply and effectively met by matching with the air tightness aviation plug 130. And the airtightness is good, so that the vacuum environment of the chamber 111 can be maintained as a test standard for a long time after the vacuum pump is stopped, multiple measurements can be performed in the vacuum environment conveniently, multiple test results can be comprehensively considered, and the reliability of the test results can be improved. The annular groove 112 is an annular structure of a closed loop, such as a circular ring, a square ring or a polygonal ring.
The lower surface of top cap 120 still is provided with three annular protruding structure 123, sets up the position and annular groove 112 one-to-one, and after top cap 120 covered and compressed tightly, three annular protruding structure 123 imbeds in three annular groove 112, together compresses tightly the sealing washer in the annular groove 112, can improve the outer route to cavity 111 of sound-proof tank lateral wall, further improves syllable-dividing effect and gas tightness.
In this embodiment, three annular grooves 112, three annular raised structures 123 and three sealing rings are provided to ensure the sealing performance, and in an alternative embodiment, at least one sealing ring is provided to simply realize the basic air tightness. Wherein, the sealing washer is the silica gel circle for example, and it is better than the corrosion resisting property of ordinary rubber circle, and life is longer.
In this embodiment, the second interface 122 is a circular through hole and is an internal thread structure, so that the screw can be conveniently connected with the through air duct connector 140, the screw can be conveniently connected with the air duct connector 140, the air duct is connected to the vacuum pumping end of the vacuum pump, the equipment is convenient to assemble, and the screw can be conveniently matched with the second interface 122 to ensure the air tightness.
Threaded holes 101 are further formed in the side walls of the cavity 110 and the top cover 120 of the sound-proof tank (in this embodiment, one side wall is taken as an example, specifically, any side wall can be provided, at least one group of the threaded holes is provided, at least one buckle 150 is provided), so as to fix the buckle 150, the cavity 110 and the top cover 120 are fixed in a combined manner through the buckle 150, and a sealed cavity 111 is provided, wherein the buckle 150 is at least arranged on two side walls, so as to ensure the whole fixing performance, ensure the whole compression of the sealing ring, and ensure the air tightness. The hasp 150 is made of a corrosion-resistant material, such as stainless steel or an aluminum alloy, so that the service life of the measuring component can be prolonged.
The sound insulation tank is an aluminum tank or an aluminum alloy tank, so that the cavity 110 and the top cover 120 can be conveniently manufactured by adopting a precision machining technology, namely, the cavity 110 and the top cover 120 can be in a precision structure aluminum structure, and the compact aluminum oxide on the surface of the aluminum material ensures that the whole oxidation resistance is good and the service life is long. The combined fixing of the cavity 110 and the top cover 120 can also be fixed by screws.
The utility model discloses a measuring subassembly sets up first interface and second interface on the top cap of sound-proof tank, first interface passes through gas tightness aviation plug seal, and microphone and outside audio tester that awaits measuring in the cavity of jar that gives sound insulation through this gas tightness aviation plug connection, realize the collection to the audio data of microphone that awaits measuring when guaranteeing the sealed of first interface, the second interface of top cap passes through the air duct and connects the vacuum pump, be used for to the cavity evacuation, and simultaneously, the upper surface at the cavity of sound-proof tank sets up the annular groove around the cavity, and be provided with the sealing washer in this annular groove, guarantee the gas tightness of the cavity of sound-proof tank and the composition surface of top cap, the gas tightness of the syllable-dividing cavity that it provided is good, facilitate for the noise test of microphone.
The utility model also provides a measuring system, include the utility model discloses a measuring component can provide the reliable cavity of gas tightness simply, provides convenience for the noise measurement of microphone, and then facilitates for the research and development of microphone.
In accordance with the embodiments of the present invention as set forth above, these embodiments are not exhaustive and do not limit the invention to the precise embodiments described. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical application, to thereby enable others skilled in the art to best utilize the invention and its various embodiments with various modifications as are suited to the particular use contemplated. The present invention is limited only by the claims and their full scope and equivalents.
Claims (8)
1. A measurement assembly for noise measurement of a microphone, comprising:
the sound insulation tank comprises a cavity and a top cover, the cavity comprises a cavity with an upper opening, the upper surface of the cavity comprises an annular groove surrounding the cavity, the top cover is arranged on the upper surface of the cavity, the position of the top cover corresponding to the opening position of the cavity comprises a first interface and a second interface of a through hole, and the second interface is connected to a vacuum pump through an air duct;
the sealing ring is arranged in an annular groove on the upper surface of the cavity;
the air tightness aviation plug is connected with the first interface of the top cover, and the two ends of the air tightness aviation plug are respectively connected and placed through a wire with the microphone to be tested and the audio tester in the cavity of the cavity.
2. The measurement assembly of claim 1,
the annular groove of the upper surface of the cavity comprises a plurality of annular grooves.
3. Measuring assembly according to claim 1,
the lower surface of the top cover further comprises an annular raised structure opposite to the annular groove of the upper surface of the cavity.
4. The measurement assembly of claim 1, further comprising:
the hasp is arranged on the side wall of the sound insulation tank and connected with the cavity and the top cover.
5. The measurement assembly of claim 1, further comprising:
and the thread is directly connected with the air duct joint and is used for connecting the air duct with the second interface.
6. The measurement assembly of claim 1,
the sound insulation tank is an aluminum tank or an aluminum alloy tank.
7. Measuring assembly according to claim 1,
the sealing ring is a silica gel ring.
8. A measuring system for noise measurement of a microphone, characterized by comprising a measuring assembly according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121904351.7U CN217770365U (en) | 2021-08-13 | 2021-08-13 | Measuring assembly and measuring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121904351.7U CN217770365U (en) | 2021-08-13 | 2021-08-13 | Measuring assembly and measuring system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217770365U true CN217770365U (en) | 2022-11-08 |
Family
ID=83868781
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121904351.7U Active CN217770365U (en) | 2021-08-13 | 2021-08-13 | Measuring assembly and measuring system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217770365U (en) |
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2021
- 2021-08-13 CN CN202121904351.7U patent/CN217770365U/en active Active
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