CN112212969A - Noise sensor - Google Patents
Noise sensor Download PDFInfo
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- CN112212969A CN112212969A CN202011079902.0A CN202011079902A CN112212969A CN 112212969 A CN112212969 A CN 112212969A CN 202011079902 A CN202011079902 A CN 202011079902A CN 112212969 A CN112212969 A CN 112212969A
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- sensor
- noise
- temperature range
- conversion unit
- metal rod
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H11/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties
- G01H11/06—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/02—Details
- H01H37/32—Thermally-sensitive members
- H01H37/46—Thermally-sensitive members actuated due to expansion or contraction of a solid
- H01H37/48—Thermally-sensitive members actuated due to expansion or contraction of a solid with extensible rigid rods or tubes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/02—Details
- H01H37/64—Contacts
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Indication And Recording Devices For Special Purposes And Tariff Metering Devices (AREA)
Abstract
The invention discloses a noise sensor, which comprises a sensor body, a conversion unit and a temperature control unit, wherein the sensor body is provided with a first sensor body and a second sensor body; the sensor body is electrically connected with the conversion unit and is used for acquiring a noise signal and outputting the noise signal to the conversion unit so that the conversion unit can process the noise signal into an electric signal for output; the temperature control unit is connected between the sensor body and the conversion unit; the temperature control unit is used for being switched on when the ambient temperature is within the set temperature range and being switched off when the ambient temperature is outside the set temperature range, so that the noise sensor works when the ambient temperature is within the set temperature range and does not work when the ambient temperature is outside the set temperature range. The invention can ensure that the noise sensor works in the matched temperature range but not in the non-set temperature range, thereby avoiding the noise sensor from working in the unmatched environment for a long time.
Description
Technical Field
The invention relates to the technical field of automobile testing, in particular to a noise sensor used in testing.
Background
The noise sensor is an important testing tool for NVH (noise, vibration and harshness) background touch and investigation work, and the common noise sensors are divided into common sensors and high-temperature sensors according to the temperature. However, most automobile manufacturers use the noise sensor, and most of the tested environments are not constant temperature environments, so that the temperature of the use environment of the sensor is difficult to control, and if the noise sensor is used in an environment which is not matched with the ambient temperature for a long time, the service life of the sensor is greatly shortened, and the testing precision is influenced.
How to ensure that the noise sensor works in the set temperature range is one of the important problems to be solved urgently in the field.
Disclosure of Invention
The invention aims to provide a noise sensor, which solves the defects in the prior art, can ensure that the noise sensor works in a matched temperature range but can not work in a non-set temperature range, and thus, the noise sensor is prevented from working in an unmatched environment for a long time. The common sensor can be effectively ensured to be used in a set temperature range, the service life of the noise sensor is prolonged, and the precision of data acquisition is improved.
The invention provides a noise sensor, which comprises a sensor body, a conversion unit and a temperature control unit, wherein the sensor body is provided with a first sensor body and a second sensor body;
the sensor body is electrically connected with the conversion unit and is used for acquiring a noise signal and outputting the noise signal to the conversion unit so that the conversion unit can process the noise signal into an electric signal for output;
the temperature control unit is connected between the sensor body and the conversion unit; the temperature control unit is used for being switched on when the ambient temperature is within a set temperature range and being switched off when the ambient temperature is outside the set temperature range, so that the noise sensor works when the ambient temperature is within the set temperature range and does not work when the ambient temperature is outside the set temperature range.
The noise sensor as described above, wherein optionally, further comprises a housing, and the sensor body, the conversion unit and the temperature control unit are all mounted in the housing;
the housing is made of a thermally conductive material; the temperature control unit comprises a fixed seat, and the fixed seat is made of a heat-conducting and insulating material;
the fixing seat is fixedly installed on the inner wall of the outer shell, so that the temperature control unit can sense the ambient temperature through the outer shell.
The noise sensor as described above, wherein optionally, the temperature control unit further comprises a first joint, a second joint, and a thermally expansive metal rod;
the first joint is electrically connected with the sensor body, and the second joint is electrically connected with the conversion unit;
the first joint and the second joint are both fixedly arranged on the fixed seat; one end of the thermal expansion metal rod is fixedly connected with the first joint, and the other end of the thermal expansion metal rod is provided with three positions; when the ambient temperature is less than the minimum value of the set temperature range, the temperature is in a first position; when the ambient temperature is greater than the maximum value of the set temperature range, the temperature is in a second position; when the ambient temperature is within the set temperature range, the device is in a third position;
the thermal expansion metal rod is not in contact with the second joint in the first position and the second position, and the thermal expansion metal rod is abutted against the second joint in the third position.
The noise sensor as described above, wherein optionally, an elongated contact is disposed on the second joint;
the length direction of the thermal expansion metal rod is parallel to the length direction of the strip-shaped contact;
one side of the other end of the thermal expansion metal rod facing the strip-shaped contact is provided with a convex contact;
when the ambient temperature is within the set temperature range, the protruding contact is abutted against the strip-shaped contact, and when the ambient temperature is outside the set temperature range, the protruding contact is not in contact with the strip-shaped contact.
The noise sensor as described above, wherein optionally, the length formula of the strip contact is: l isa＝α·L·(Tmax-Tmin)；
Wherein L isaThe length of the strip contact, alpha is the linear thermal expansion coefficient of the thermal expansion metal rod; l is the length of the heat expandable metal rod, TmaxTo set the maximum value of the temperature range, TminIs the minimum value of the set temperature range.
The noise sensor as described above, wherein, optionally, an end of the thermally expansive metal rod near the first joint abuts against the fixing base.
The noise sensor as described above, wherein optionally the set temperature range is-30 ℃ to 100 ℃.
The noise sensor as described above, wherein optionally the sensor body is a capacitive sensor;
the sensor body is connected with the conversion unit through a signal line and a power line respectively;
the signal wire is used for outputting the noise signal acquired by the sensor body to the conversion unit;
the power line is used for supplying power to the sensor body through an external power supply connected with the conversion unit.
The noise sensor as described above, wherein, optionally, the thermal expansion metal rod is made of a metal or an alloy having a linear thermal expansion coefficient of more than 20.
Compared with the prior art, the noise sensor is switched on when the ambient temperature is within the set temperature range and switched off when the ambient temperature is outside the set temperature range by arranging the temperature control unit, so that the noise sensor works when the ambient temperature is within the set temperature range and does not work when the ambient temperature is outside the set temperature range. Therefore, the noise sensor can be ensured to work at the matched temperature all the time, and the improvement of the test precision and the service life are facilitated. In addition, the invention has simple structure, low cost and convenient popularization and use.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic structural view of the present invention;
fig. 3 is a schematic structural diagram of a temperature control unit according to the present invention.
Description of reference numerals: 1-a sensor body, 2-a conversion unit, 3-a temperature control unit, 4-a shell, 5-a signal wire and 6-a power wire;
31-a fixed seat, 32-a first joint, 33-a second joint, 34-a thermally expandable metal rod;
331-elongated contacts, 341-raised contacts.
Detailed Description
The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.
Referring to fig. 1 to 3, the present invention provides a noise sensor, which includes a sensor body 1, a conversion unit 2 and a temperature control unit 3. The sensor body 1 is used for detecting noise signals, and the conversion unit 2 is mainly used for processing the noise signals, such as signal type conversion, signal amplification, signal filtering and the like. The temperature control unit 3 is used for controlling whether the sensor body 1 works or not according to the ambient temperature.
The sensor body 1 is electrically connected with the conversion unit 2, and the sensor body 1 is used for acquiring a noise signal and outputting the noise signal to the conversion unit 2, so that the conversion unit 2 can process the noise signal into an electric signal for output.
The temperature control unit 3 is connected between the sensor body 1 and the conversion unit 2; the temperature control unit 3 is used for being switched on when the ambient temperature is within a set temperature range and being switched off when the ambient temperature is outside the set temperature range, so that the noise sensor works when the ambient temperature is within the set temperature range and does not work when the ambient temperature is outside the set temperature range.
When the noise sensor is used specifically, the noise sensor is placed in an environment to be detected, if the environment temperature is within a preset temperature range, the sensor body 1 outputs the acquired noise signal to the conversion unit 2, and the processed noise signal is output to the outside through the conversion unit 2. If the ambient temperature is not outside the preset temperature range, the noise signal is not output outwards, i.e. the noise sensor does not work. So, can guarantee when the test, when noise sensor was placed under improper temperature environment, noise sensor was out of work, therefore can avoid noise sensor because long-term work under unmatched temperature and the damage that causes, can guarantee noise sensor's life detection precision.
As a better implementation manner, the noise sensor further includes a housing 4, and the sensor body 1, the conversion unit 2, and the temperature control unit 3 are all installed in the housing 4. The housing 4 is made of a heat conductive material; the temperature control unit 3 comprises a fixed seat 31, and the fixed seat 31 is made of a heat conducting and insulating material. The casing 4 is made of a heat conductive material, which can facilitate heat conduction and heat conduction, so that the ambient temperature can be sensed more accurately. The fixing seat 31 is fixedly installed on the inner wall of the housing 4, so that the temperature control unit 3 can sense the ambient temperature through the housing 4.
In a specific implementation, the temperature control unit 3 may be controlled by an electronic component, such as an electronic component made of a heat-sensitive semiconductor material. As a preferred implementation, the temperature control unit 3 further comprises a first joint 32, a second joint 33 and a thermally expandable metal rod 34. Specifically, in the present embodiment, the temperature control unit 3 is turned on and off at different temperatures by the thermally expanded metal rod 34. Specifically, the first connector 32 is electrically connected to the sensor body 1, and the second connector 33 is electrically connected to the conversion unit 2.
Specifically, the first joint 32 and the second joint 33 are both fixedly disposed on the fixing seat 31; one end of the thermal expansion metal rod 34 is fixedly connected with the first joint 32, and the other end has three positions; when the ambient temperature is less than the minimum value of the set temperature range, the temperature is in a first position; when the ambient temperature is greater than the maximum value of the set temperature range, the temperature is in a second position; and when the ambient temperature is within the set temperature range, the third position is achieved. In practice, the fixing base 31 is made of a heat conducting and insulating material. In the first position and the second position, the thermally expandable metal rod 34 is not in contact with the second joint 33, and in the third position, the thermally expandable metal rod 34 interferes with the second joint 33.
More specifically, the second connector 33 is provided with an elongated contact 331; the length direction of the thermal expansion metal rod 34 is parallel to the length direction of the elongated contact 331. A convex contact 341 is arranged at one side of the other end of the thermal expansion metal rod 34 facing the strip-shaped contact 331; when the ambient temperature is within the set temperature range, the protruding contact 341 abuts against the elongated contact 331, and when the ambient temperature is outside the set temperature range, the protruding contact 341 does not contact the elongated contact 331. In implementation, when the environmental temperature reaches the minimum value of the set temperature range, the convex contact 341 abuts against one end of the strip-shaped contact 331; when the ambient temperature reaches the maximum value of the set temperature range, the convex contact 341 abuts against the other end of the strip-shaped contact 331; when the ambient temperature is within the measurement temperature range, the protruding contact 341 abuts against the elongated contact 331 and the middle of the elongated contact 331.
In particular, the strip-shaped contact has a lengthThe formula is as follows: l isa＝α·L·(Tmax-Tmin) (ii) a Wherein L isaThe length of the strip contact, α is the linear thermal expansion coefficient of the thermally-expansible metal rod 34; l is the length of the thermally expansive metal rod 34, TmaxTo set the maximum value of the temperature range, TminIs the minimum value of the set temperature range. In practice, the length of the thermally expansive metal rod 34 is determined as desired.
In a preferred implementation, one end of the thermal expansion metal rod 34 close to the first joint 32 abuts against the fixed seat 31. Specifically, one end of the heat expandable metal rod 34 is wrapped in the fixing seat 31, so that heat can be rapidly transferred to the heat expandable metal rod 34, and the temperature of the heat expandable metal rod 34 can be rapidly adjusted to the ambient temperature.
Specifically, the set temperature range is-30 ℃ to 100 ℃.
As a preferred implementation, the sensor body 1 is a capacitive sensor. Specifically, the capacitive sensor needs to be powered, so that whether the noise sensor works or not can be controlled by controlling the on-off of a power supply. Specifically, the sensor body 1 is connected with the conversion unit 2 through a signal line 5 and a power line 6 respectively; the signal line 5 is used for outputting the noise signal acquired by the sensor body 1 to the conversion unit 2. The power cord 6 is used for supplying power to the sensor body 1 through an external power supply connected with the conversion unit 2.
As a preferred realization, the thermally expansive metal rod 34 is made of a metal or alloy having a linear thermal expansion coefficient greater than 20. Specifically, the thermally expansive metal rod 34 may be aluminum or an aluminum alloy.
During specific implementation, the temperature control unit is further used for being connected with external equipment so as to output a working state signal to the external equipment, for example, whether the ambient temperature is too low or too high, whether the ambient temperature is adapted to a temperature range applicable to the noise detection sensor, and the like.
When the noise sensor is used specifically, a noise signal is converted into an electric signal by the noise sensor and is uploaded to a data acquisition system; when the external environment temperature exceeds the upper limit of the service temperature of the noise sensor (such as 100 ℃), the shell 4 transmits the environment temperature to the thermal expansion metal rod 34 on the temperature control unit 3, the thermal expansion metal rod 34 expands when being heated and disconnects the power line, at this time, the sensor body does not work, the noise signal cannot be normally converted into an electric signal and transmitted to the data acquisition system, and the system can report an error or send a prompt signal to be displayed on an operation interface; when the external environment temperature is lower than the lower limit of the use temperature (such as-30 ℃) of the noise sensor, the shell 4 can conduct the environment temperature to the thermal expansion metal rod 34, the thermal expansion metal rod can contract when being cooled, the power line is disconnected, the noise sensor can not normally convert the noise signal into an electric signal and transmit the electric signal to the data acquisition system, and the system can report an error or send a prompt signal and display the signal on an operation interface. When placed at an appropriate ambient temperature, the sensor body 1 normally outputs a noise signal. Therefore, the invention can prolong the service life of the noise sensor and improve the accuracy of data acquisition. The scheme is simple and convenient, the cost is the lowest, and the method is easy to implement compared with other strengthening schemes.
The construction, features and functions of the present invention are described in detail in the embodiments illustrated in the drawings, which are only preferred embodiments of the present invention, but the present invention is not limited by the drawings, and all equivalent embodiments modified or changed according to the idea of the present invention should fall within the protection scope of the present invention without departing from the spirit of the present invention covered by the description and the drawings.
Claims (9)
1. A noise sensor, characterized by: comprises a sensor body (1), a conversion unit (2) and a temperature control unit (3);
the sensor body (1) is electrically connected with the conversion unit (2), and the sensor body (1) is used for acquiring a noise signal and outputting the noise signal to the conversion unit (2) so that the conversion unit (2) can process the noise signal into an electric signal for output;
the temperature control unit (3) is connected between the sensor body (1) and the conversion unit (2); the temperature control unit (3) is used for being switched on when the ambient temperature is within a set temperature range and being switched off when the ambient temperature is outside the set temperature range, so that the noise sensor works when the ambient temperature is within the set temperature range and does not work when the ambient temperature is outside the set temperature range.
2. The noise sensor of claim 1, wherein: the sensor comprises a sensor body (1), a conversion unit (2) and a temperature control unit (3), and is characterized by further comprising a shell (4), wherein the sensor body, the conversion unit (2) and the temperature control unit (3) are all arranged in the shell (4);
the housing (4) is made of a heat conductive material; the temperature control unit (3) comprises a fixed seat (31), and the fixed seat (31) is made of a heat-conducting insulating material;
the fixing seat (31) is fixedly installed on the inner wall of the shell (4) body, so that the temperature control unit (3) can sense the ambient temperature through the shell (4).
3. The noise sensor of claim 2, wherein: the temperature control unit (3) further comprises a first joint (32), a second joint (33) and a heat expansion metal rod (34);
the first joint (32) is electrically connected with the sensor body (1), and the second joint (33) is electrically connected with the conversion unit (2);
the first joint (32) and the second joint (33) are both fixedly arranged on the fixed seat (31); one end of the thermal expansion metal rod (34) is fixedly connected with the first joint (32), and the other end of the thermal expansion metal rod is provided with three positions; when the ambient temperature is less than the minimum value of the set temperature range, the temperature is in a first position; when the ambient temperature is greater than the maximum value of the set temperature range, the temperature is in a second position; when the ambient temperature is within the set temperature range, the device is in a third position;
in the first position and the second position, the thermally expandable metal rod (34) is not in contact with the second joint (33), and in the third position, the thermally expandable metal rod (34) interferes with the second joint (33).
4. The noise sensor of claim 3, wherein: the second joint (33) is provided with a strip-shaped contact (331);
the length direction of the thermal expansion metal rod (34) is parallel to the length direction of the long strip-shaped contact (331);
a convex contact (341) is arranged on one side of the other end of the thermal expansion metal rod (34) facing the strip-shaped contact (331);
when the environment temperature is within the set temperature range, the protruding contact (341) abuts against the elongated contact (331), and when the environment temperature is outside the set temperature range, the protruding contact (341) is not in contact with the elongated contact (331).
5. The noise sensor of claim 4, wherein: the length formula of the strip-shaped contact is as follows: l isa＝α·L·(Tmax-Tmin)；
Wherein L isaIs the length of the strip contact, alpha is the linear thermal expansion coefficient of the thermal expansion metal rod (34); l is the length of the thermally expandable metal rod (34), TmaxTo set the maximum value of the temperature range, TminIs the minimum value of the set temperature range.
6. The noise sensor of claim 3, wherein: one end of the thermal expansion metal rod (34) close to the first joint (32) is abutted against the fixed seat (31).
7. The noise sensor according to any one of claims 1 to 6, wherein: the set temperature range is-30 ℃ to 100 ℃.
8. The noise sensor according to any one of claims 1 to 6, wherein: the sensor body (1) is a capacitive sensor;
the sensor body (1) is connected with the conversion unit (2) through a signal line (5) and a power line (6) respectively;
the signal wire (5) is used for outputting the noise signal acquired by the sensor body (1) to the conversion unit (2);
the power line (6) is used for supplying power to the sensor body (1) through an external power supply connected with the conversion unit (2).
9. The noise sensor according to any one of claims 3 to 6, wherein: the heat-expandable metal rod (34) is made of a metal or an alloy having a linear heat expansion coefficient of greater than 20.
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| CN202011079902.0A CN112212969B (en) | 2020-10-10 | 2020-10-10 | Noise sensor |
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| CN202011079902.0A CN112212969B (en) | 2020-10-10 | 2020-10-10 | Noise sensor |
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| CN112212969B CN112212969B (en) | 2021-08-31 |
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