CN114252146B - Sensitivity frequency characteristic adjustment circuit, vibration sensor, and sensor - Google Patents
Sensitivity frequency characteristic adjustment circuit, vibration sensor, and sensor Download PDFInfo
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- CN114252146B CN114252146B CN202111506217.6A CN202111506217A CN114252146B CN 114252146 B CN114252146 B CN 114252146B CN 202111506217 A CN202111506217 A CN 202111506217A CN 114252146 B CN114252146 B CN 114252146B
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- 230000035945 sensitivity Effects 0.000 title claims abstract description 86
- 238000001914 filtration Methods 0.000 claims abstract description 67
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 22
- 238000003786 synthesis reaction Methods 0.000 claims abstract description 22
- 239000003990 capacitor Substances 0.000 claims description 31
- 230000007547 defect Effects 0.000 abstract description 2
- 230000002194 synthesizing effect Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H17/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H11/00—Networks using active elements
- H03H11/02—Multiple-port networks
- H03H11/04—Frequency selective two-port networks
- H03H11/12—Frequency selective two-port networks using amplifiers with feedback
- H03H11/1217—Frequency selective two-port networks using amplifiers with feedback using a plurality of operational amplifiers
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- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The invention provides a sensitivity frequency characteristic adjusting circuit, a vibration sensor and a sensor. A sensitivity frequency characteristic adjustment circuit for adjusting sensitivity frequency characteristics of a sensor, the circuit comprising: a first resistor; the first end of the first resistor is electrically connected with the sensor; a filtering module; the input end of the filtering module is electrically connected with the first end of the first resistor, and the output end of the filtering module is electrically connected with the second end of the first resistor to form a first common end; a signal synthesis module; the signal synthesis module is electrically connected with the first public end. The invention is used for solving the defects that the sensitivity curve of the existing sensor is large in fluctuation, the frequency response of the sensor is poor, and the working frequency range is narrow.
Description
Technical Field
The present invention relates to the field of electronic technology, and in particular, to a sensitivity frequency characteristic adjusting circuit, a vibration sensor, and a sensor.
Background
The frequency characteristic of the sensitivity is related to the frequency range of use of the sensor, i.e. the operating range. In general, the sensitivity frequency characteristic curve of the sensor is not a flat straight line, but the sensitivity value at some frequency points tends to rise or fall. This characteristic is due to the mechanical or electrical characteristics of the sensor principle and is difficult to change. The sensitivity curve of the existing sensor is large in fluctuation, the frequency response characteristic of the sensor is poor, and the working frequency range is narrow.
Disclosure of Invention
The invention provides a sensitivity frequency characteristic adjusting circuit, a vibration sensor and a sensor, which are used for solving the defects that the sensitivity curve of the existing sensor is large in fluctuation, the frequency response of the sensor is poor, and the working frequency range is narrow.
The invention provides a sensitivity frequency characteristic adjusting circuit for adjusting sensitivity frequency characteristic of a sensor, the circuit comprises:
a first resistor; the first end of the first resistor is electrically connected with the sensor;
a filtering module; the input end of the filtering module is electrically connected with the first end of the first resistor, and the output end of the filtering module is electrically connected with the second end of the first resistor to form a first common end; and
a signal synthesis module; the signal synthesis module is electrically connected with the first public end.
According to the sensitivity frequency characteristic adjusting circuit provided by the invention, the filtering module comprises a first low-pass filtering module, and the first low-pass filtering module comprises:
the input end of the first voltage follower is electrically connected with the first end of the first resistor;
the input end of the first low-pass filter circuit is electrically connected with the output end of the first voltage follower;
and
the input end of the second voltage follower is electrically connected with the output end of the first low-pass filter circuit, and the output end of the second voltage follower is electrically connected with the second end of the first resistor to form a first common end.
According to the sensitivity frequency characteristic adjusting circuit provided by the invention, the filtering module further comprises a high-pass filtering module connected with the first low-pass filtering module in parallel,
the high-pass filtering module includes:
the input end of the third voltage follower is electrically connected with the first end of the first resistor;
the input end of the high-pass filter circuit is electrically connected with the output end of the third voltage follower;
and
the input end of the fourth voltage follower is electrically connected with the output end of the high-pass filter circuit, and the output end of the fourth voltage follower is electrically connected with the output end of the second voltage follower and the second end of the first resistor respectively to form a first common end.
According to the sensitivity frequency characteristic adjusting circuit provided by the invention, the filtering module further comprises a second low-pass filtering module connected with the first low-pass filtering module in parallel;
the second low pass filtering module includes:
the input end of the fifth voltage follower is electrically connected with the first end of the first resistor;
the input end of the second low-pass filter circuit is electrically connected with the output end of the fifth voltage follower;
and
the input end of the sixth voltage follower is electrically connected with the output end of the second low-pass filter circuit, and the output end of the sixth voltage follower is electrically connected with the output end of the second voltage follower and the second end of the first resistor respectively to form a first common end.
According to the present invention, there is provided a sensitivity frequency characteristic adjusting circuit, the first low-pass filter circuit comprising:
a second resistor; the first end of the second resistor is electrically connected with the output end of the first voltage follower,
the first end of the first capacitor is electrically connected with the second end of the second resistor; the second end of the first capacitor is grounded.
According to the present invention, there is provided a sensitivity frequency characteristic adjusting circuit, the high-pass filter circuit comprising:
a second capacitor; the first end of the second capacitor is electrically connected with the output end of the third voltage follower,
the first end of the third resistor is electrically connected with the second end of the second capacitor; the second end of the third resistor is grounded.
According to the present invention, there is provided a sensitivity frequency characteristic adjusting circuit, the second low-pass filter circuit comprising:
a fifth resistor; the first end of the fifth resistor is electrically connected with the output end of the fifth voltage follower,
the first end of the third capacitor is electrically connected with the second end of the fifth resistor; the second end of the first capacitor is grounded.
According to the sensitivity frequency characteristic adjusting circuit provided by the invention, the sensitivity frequency characteristic adjusting circuit further comprises an operational amplifier electrically connected with the output end of the signal synthesis module, the output end of the signal synthesis module is electrically connected with the inverting input end of the operational amplifier, and the non-inverting input end of the operational amplifier is grounded.
The invention also provides a vibration sensor, which comprises a vibration sensor body and the sensitivity frequency characteristic adjusting circuit electrically connected with the vibration sensor body.
The invention also provides a sensor, which comprises a sensor body and the sensitivity frequency characteristic adjusting circuit electrically connected with the sensor body.
The sensitivity frequency characteristic adjusting circuit, the vibration sensor and the sensor are electrically connected with the sensor through the first end of the first resistor; the input end of the filtering module is electrically connected with the first end of the first resistor, and the output end of the filtering module is electrically connected with the second end of the first resistor to form a first common end; and the signal synthesis module is electrically connected with the first common terminal. Therefore, the signal synthesis module synthesizes the output signal of the sensor passing through the filtering module with the sensor output signal of the original output signal of the sensor passing through the first resistor, and the adjustment of the sensitivity frequency response characteristic of the sensor is realized, so that the sensitivity curve of the sensor is flatter, the frequency response characteristic of the sensor is improved, and the working frequency range of the sensor is widened.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic circuit diagram of a sensitivity frequency characteristic adjusting circuit according to the present invention;
FIG. 2 is a second schematic circuit diagram of the sensitivity frequency characteristic adjusting circuit according to the present invention;
FIG. 3 is a third schematic circuit diagram of the sensitivity frequency characteristic adjusting circuit according to the present invention;
FIG. 4 is a schematic diagram of a sensitivity frequency characteristic adjusting circuit according to the present invention;
FIG. 5 is a schematic circuit diagram of an operational amplifier provided by the present invention;
fig. 6 shows a sensitivity curve of a conventional vibration sensor and a sensitivity curve of a vibration sensor according to the present invention after passing through a sensitivity frequency characteristic adjustment circuit.
Reference numerals:
100: a sensitivity frequency characteristic adjustment circuit; 10: a first resistor; 20: a filtering module; 30: a signal synthesis module; 21: a first low pass filtering module; 211: a first voltage follower; 212: a first low-pass filter circuit; 213: a second voltage follower; 2121: a second resistor; 2122: a first capacitor; 22: a high-pass filtering module; 221: a third voltage follower; 222: a high-pass filter circuit; 223: a fourth voltage follower; 2221: a third resistor; 2222: a second capacitor; 23: a second low pass filtering module; 231: a fifth voltage follower; 232: a second low pass filter circuit; 233: a sixth voltage follower; 2321: a fifth resistor; 2322: a third capacitor; 40: an operational amplifier.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The technical term "sensitivity frequency response" or "sensitivity frequency response" in the present invention refers to the sensitivity versus frequency curve of the sensor. The frequency response curve in the ideal case should be flat.
Referring to fig. 1, the sensitivity frequency characteristic adjusting circuit 100 of the present invention is described below with reference to fig. 1 to 6, and referring to fig. 1, the sensitivity frequency characteristic adjusting circuit 100 of the present invention is used for adjusting the sensitivity frequency characteristic of a sensor, and the sensitivity frequency characteristic adjusting circuit 100 includes: a first resistor 10, a filter module 20 and a signal synthesis module 30.
A first resistor 10; the first end of the first resistor 10 is electrically connected to the sensor. The sensor can be various sensors, such as a vibration sensor, a pressure sensor, a displacement sensor, a temperature and humidity sensor, and the like.
A filtering module 20; the input end of the filtering module 20 is electrically connected to the first end of the first resistor 10, and the output end of the filtering module 20 is electrically connected to the second end of the first resistor 10 to form a first common end. In other words, the filter module 20 is connected in parallel with the first resistor 10. The filtering module 20 is used to alter the frequency response characteristics of the raw output signal of the sensor.
A signal synthesis module 30; the signal synthesis module 30 is electrically connected to the first common terminal. The signal synthesis module 30 is configured to synthesize a signal of the sensor passing through the first resistor 10 and a signal of the sensor passing through the filtering module 20, so as to adjust a sensitivity frequency response characteristic of the sensor, so that a sensitivity curve of the sensor is flatter, improve the frequency response characteristic of the sensor, and widen a working frequency range of the sensor.
The signal synthesizing module 30 may be an operational amplifier, and an inverting input terminal of the operational amplifier is electrically connected to a first common terminal formed between the first resistor 10 and the filtering module 20. The non-inverting input of the operational amplifier 40 is connected to ground through a resistor. The operational amplifier is equivalent to an adder to add signals of the sensor passing through the first resistor 10 and the filtering module 20, so that the sensitivity frequency response characteristic of the sensor is adjusted, the sensitivity curve of the sensor is flatter, the frequency response characteristic of the sensor is improved, and the working frequency range of the sensor is widened.
The first end of the first resistor 10 is electrically connected with the sensor; the input end of the filter module 20 is electrically connected with the first end of the first resistor 10, and the output end of the filter module 20 is electrically connected with the second end of the first resistor 10 to form a first common end; and the signal synthesis module 30 is electrically connected to the first common terminal. Therefore, the signal synthesis module 30 synthesizes the output signal of the sensor passing through the filtering module 20 with the sensor output signal of the original output signal of the sensor passing through the first resistor 10, and realizes the adjustment of the sensitivity frequency response characteristic of the sensor, so that the sensitivity curve of the sensor is flatter, the frequency response characteristic of the sensor is improved, and the working frequency range of the sensor is widened.
Referring to fig. 2, in some embodiments, the filtering module 20 includes a first low-pass filtering module 21, and the first low-pass filtering module 21 includes: a first voltage follower 211, a first low-pass filter circuit 212 and a second voltage follower 213.
The input end of the first voltage follower 211 is electrically connected to the first end of the first resistor 10; the input end of the first low-pass filter circuit 212 is electrically connected with the output end of the first voltage follower 211; the input end of the second voltage follower 213 is electrically connected to the output end of the first low-pass filter circuit 212, and the output end of the second voltage follower 213 is electrically connected to the second end of the first resistor 10 to form a first common end.
Further, the first low-pass filter circuit 212 includes: second resistor 2121 and first capacitor 2122. The first end of the second resistor 2121 is electrically connected to the output end of the first voltage follower 211. A first end of the first capacitor 2122 is electrically connected to a second end of the second resistor 2121; the second end of the first capacitor 2122 is grounded. The first low-pass filter circuit 212, which is composed of the second resistor 2121 and the first capacitor 2122, achieves a mid-high band response that reduces the sensitivity of the sensor.
The first voltage follower 211 makes the input voltage of the sensor input first voltage follower 211 be the same as the output voltage of the first voltage follower 211, and meanwhile, the first voltage follower 211 makes the signal of the sensor passing through the first low-pass filter circuit 212 isolated from the original output signal of the sensor, so that the signals are not interfered with each other. Likewise, the second voltage follower 213 makes the voltage input to the second voltage follower 213 the same as the voltage output to the second voltage follower 213. The second voltage follower 213 isolates the first low-pass filter circuit 212 from the signal synthesizing module 30, and does not interfere with each other.
The original output signal of the sensor passes through the first low-pass filtering module 21, so that the frequency response of the high frequency band in the sensitivity is reduced, the original output signal is synthesized with the signal of the sensor through the first resistor 10, the frequency response range of the high frequency band in the sensor is prolonged, the sensitivity of the high frequency band of the sensor is enabled to be in a descending trend, the sensitivity curve of the sensor is enabled to be flat, the frequency response characteristic of the sensor is improved, and the working frequency range of the sensor is widened.
It should be noted that, the first voltage follower 211 and the second voltage follower 213 may use an operational amplifier, and the non-inverting input terminal of the operational amplifier is used as the input terminal of the first voltage follower 211 and the second voltage follower 213. The first voltage follower 211 and the second voltage follower 213 may employ an operational amplifier manufactured by aderno investment limited with a model op177 or op 07.
Referring to fig. 3, in other embodiments, the filtering module 20 further includes a first low-pass filtering module 21 and a high-pass filtering module 22 connected in parallel with the first low-pass filtering module 21. The high-pass filtering module 22 includes: a third voltage follower 221, a high pass filter circuit 222 and a fourth voltage follower 223.
Wherein, the input end of the third voltage follower 221 is electrically connected to the first end of the first resistor 10; an input end of the high-pass filter circuit 222 is electrically connected to an output end of the third voltage follower 221; an input end of the fourth voltage follower 223 is electrically connected to an output end of the high-pass filter circuit 222, and an output end of the fourth voltage follower 223 is electrically connected to an output end of the second voltage follower 213 and a second end of the first resistor 10 respectively to form a first common end.
Further, the high-pass filter circuit 222 includes: a third resistor 2221 and a second capacitor 2222.
A first end of the second capacitor 2222 is electrically connected to the output end of the third voltage follower 221, and a first end of the third resistor 2221 is electrically connected to a second end of the second capacitor 2222; the second terminal of the third resistor 2221 is grounded. The second resistor 2121 and the first capacitor 2122 form a high-pass filter circuit 222 to improve the sensitivity frequency response of the high-frequency band of the sensor.
The third voltage follower 221 makes the input voltage of the sensor input third voltage follower 221 be the same as the output voltage of the third voltage follower 221, and meanwhile, the third voltage follower 221 makes the signal of the sensor passing through the high-pass filter circuit 222 and the original output signal of the sensor isolated from each other, and the signals are not interfered with each other. Likewise, the fourth voltage follower 223 makes the voltage input to the fourth voltage follower 223 the same as the voltage output from the fourth voltage follower 223. The fourth voltage follower 223 isolates the high-pass filter circuit 222 from the signal combining module 30, without interfering with each other.
The original output signal of the sensor is passed through the high-pass filter circuit 222 to increase the sensitivity frequency response of the high-frequency band of the sensor, and is secondarily synthesized with the result of the sensor passing through the first resistor 10 and the sensor passing through the first low-pass filter module 21. Since the original output signal of the sensor passes through the first resistor 10 and the first low-pass filter module 21, the sensitivity of the sensor in the high-frequency band is in a decreasing trend, and the sensitivity curve passing through the first resistor 10 and the first low-pass filter module 21 in a decreasing trend is harmonized by the high-pass filter circuit 222, so that the flat frequency characteristic of the sensitivity in a wider frequency range is obtained. Thereby improving the frequency response characteristic of the sensor and widening the working frequency range of the sensor.
It should be noted that the third voltage follower 221 and the fourth voltage follower 223 may use an operational amplifier, and the non-inverting input terminal of the operational amplifier is used as the input terminal of the third voltage follower 221 and the fourth voltage follower 223. The third voltage follower 221 and the fourth voltage follower 223 may employ an operational amplifier manufactured by aderno investment limited with a model op177 or op 07.
Referring to fig. 4, in other embodiments, the filtering module 20 further includes a first low-pass filtering module 21 and a second low-pass filtering module 23 connected in parallel with the first low-pass filtering module 21.
The second low-pass filtering module 23 comprises: a fifth voltage follower 231, a second low-pass filter circuit 232, and a sixth voltage follower 233.
The input end of the fifth voltage follower 231 is electrically connected to the first end of the first resistor 10; the input end of the second low-pass filter circuit 232 is electrically connected to the output end of the fifth voltage follower 231; an input end of the sixth voltage follower 233 is electrically connected to an output end of the second low-pass filter circuit 232, and an output end of the sixth voltage follower 233 is electrically connected to an output end of the second voltage follower 213 and a second end of the first resistor 10 respectively to form a first common end.
The second low-pass filter circuit 232 includes: fifth resistor 2321 and third capacitor 2322.
A first end of the fifth resistor 2321 is electrically connected to the output end of the fifth voltage follower 231, and a first end of the third capacitor 2322 is electrically connected to the second end of the fifth resistor 2321; the second end of the third capacitor 2322 is grounded. In the present embodiment, the cut-off frequency of the second low-pass filter circuit 232 formed by the fifth resistor 2321 and the third capacitor 2322 is higher than the cut-off frequency of the first low-pass filter circuit 212 formed by the second resistor 2121 and the first capacitor 2122.
The second low-pass filter circuit 232 composed of the fifth resistor 2321 and the third capacitor 2322 realizes further low-pass filtering, so that the rising trend of the sensitivity curve of the sensor in the middle-high frequency band is slowed down, and the flat frequency characteristic of the sensitivity in a wider frequency range is obtained. Thereby improving the frequency response characteristic of the sensor and widening the working frequency range of the sensor.
The fifth voltage follower 231 makes the input voltage of the sensor input fifth voltage follower 231 be the same as the output voltage of the fifth voltage follower 231, and meanwhile, the fifth voltage follower 231 makes the signal of the sensor passing through the high-pass filter circuit 222 and the original output signal of the sensor isolated from each other, so that the signals do not interfere with each other. Likewise, the sixth voltage follower 233 makes the voltage input to the sixth voltage follower 233 the same as the voltage output to the sixth voltage follower 233. The sixth voltage follower 233 isolates the high-pass filter circuit 222 from the signal synthesizing module 30, and does not interfere with each other.
It should be noted that the fifth voltage follower 231 and the sixth voltage follower 233 may use the operational amplifier 40, and the non-inverting input terminal of the operational amplifier 40 is used as the input terminals of the fifth voltage follower 231 and the sixth voltage follower 233. The fifth voltage follower 231 and the sixth voltage follower 233 may employ an operational amplifier manufactured by aderno investment limited with a model number op177 or op 07.
In other embodiments, the sensitivity frequency characteristic adjusting circuit 100 further includes an operational amplifier 40 electrically connected to the output end of the signal synthesizing module 30, wherein the output end of the signal synthesizing module 30 is electrically connected to the inverting input end of the operational amplifier 40, and the non-inverting input end of the operational amplifier 40 is grounded after passing through a resistor.
Referring to fig. 5, after the sensitivity frequency response of the sensor is adjusted by the signal synthesis module 30, since the phase of the sensor signal is changed by 180 degrees by the previous change of the filter module 20 and the signal synthesis module 30, the output signal of the signal synthesis module 30 needs to be phase-deflected by 180 degrees by the operational amplifier 40, so as to keep the phase of the output signal consistent with the original output signal of the sensor.
The following describes the beneficial effects of the sensitivity frequency characteristic adjusting circuit 100 according to the present embodiment, taking an embodiment in which the filtering module 20 includes a first low-pass filtering module 21 and a high-pass filtering module 22 connected in parallel with the first low-pass filtering module 21 and is electrically connected to the operational amplifier 40 at the output end of the signal synthesizing module 30 as an example. Take the sensitivity frequency characteristic of the vibration sensor as an example. Referring to fig. 6, fig. 6 shows a sensitivity curve of a conventional vibration sensor and a sensitivity curve of a vibration sensor according to the present invention after the sensitivity frequency characteristic adjustment circuit 100. As is apparent from the figure, in the frequency range of 0-200 Hz, the sensitivity curve of the vibration sensor of the present invention is flatter than that of the existing vibration sensor, thereby improving the frequency response characteristic of the sensor and widening the operating frequency range of the sensor.
The embodiment of the invention is electrically connected with the sensor through the first end of the first resistor; the input end of the filtering module is electrically connected with the first end of the first resistor, and the output end of the filtering module is electrically connected with the second end of the first resistor to form a first common end; and the signal synthesis module is electrically connected with the first common terminal. Therefore, the signal synthesis module synthesizes the output signal of the sensor passing through the filtering module with the output signal of the sensor, which is the original output signal of the sensor passing through the first resistor, so as to change the sensitivity frequency response curve of the vibration sensor, so that the sensitivity frequency response curve of the vibration sensor is flatter, the available working frequency response range is wider, the corresponding sensor (such as the vibration sensor) is more accurate, and the use value of the sensor is improved. According to the embodiment of the invention, the technical requirements of the vibration metering technical regulation are met through the flat part of the sensitivity frequency response curve, and meanwhile, the accurate measured value in a wide frequency range can be obtained through the sensor with flat sensitivity.
The present invention also provides a vibration sensor (not shown), which comprises a vibration sensor body and the sensitivity frequency characteristic adjusting circuit 100 electrically connected with the vibration sensor body. The specific structure of the sensitivity frequency characteristic adjusting circuit 100 refers to the above embodiment, and since the vibration sensor adopts all the technical solutions of all the embodiments, at least the beneficial effects of the technical solutions of the embodiments are provided, and will not be described in detail herein.
The invention also provides a sensor (not shown), which comprises a sensor body and the sensitivity frequency characteristic adjusting circuit 100 electrically connected with the sensor body. The specific structure of the sensitivity frequency characteristic adjusting circuit 100 refers to the above embodiment, and since the sensor adopts all the technical solutions of all the embodiments, the sensor has at least all the beneficial effects brought by the technical solutions of the embodiments, and will not be described in detail herein.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A sensitivity frequency characteristic adjustment circuit for adjusting sensitivity frequency characteristics of a sensor, the circuit comprising:
a first resistor; the first end of the first resistor is electrically connected with the sensor;
a filtering module; the input end of the filtering module is electrically connected with the first end of the first resistor, and the output end of the filtering module is electrically connected with the second end of the first resistor to form a first common end; and
a signal synthesis module; the signal synthesis module is electrically connected with the first public end.
2. The sensitivity frequency characteristic adjusting circuit according to claim 1, wherein,
the filtering module includes a first low pass filtering module including:
the input end of the first voltage follower is electrically connected with the first end of the first resistor;
the input end of the first low-pass filter circuit is electrically connected with the output end of the first voltage follower;
and
the input end of the second voltage follower is electrically connected with the output end of the first low-pass filter circuit, and the output end of the second voltage follower is electrically connected with the second end of the first resistor to form a first common end.
3. The sensitivity frequency characteristic adjusting circuit according to claim 2, wherein,
the filtering module further comprises a high pass filtering module connected in parallel with the first low pass filtering module,
the high-pass filtering module includes:
the input end of the third voltage follower is electrically connected with the first end of the first resistor;
the input end of the high-pass filter circuit is electrically connected with the output end of the third voltage follower;
and
the input end of the fourth voltage follower is electrically connected with the output end of the high-pass filter circuit, and the output end of the fourth voltage follower is electrically connected with the output end of the second voltage follower and the second end of the first resistor respectively to form a first common end.
4. The sensitivity frequency characteristic adjusting circuit according to claim 2, wherein,
the filtering module further comprises a second low-pass filtering module connected with the first low-pass filtering module in parallel;
the second low pass filtering module includes:
the input end of the fifth voltage follower is electrically connected with the first end of the first resistor;
the input end of the second low-pass filter circuit is electrically connected with the output end of the fifth voltage follower;
and
the input end of the sixth voltage follower is electrically connected with the output end of the second low-pass filter circuit, and the output end of the sixth voltage follower is electrically connected with the output end of the second voltage follower and the second end of the first resistor respectively to form a first common end.
5. The sensitivity frequency characteristic adjusting circuit according to claim 2, wherein the first low-pass filter circuit includes:
a second resistor; the first end of the second resistor is electrically connected with the output end of the first voltage follower,
the first end of the first capacitor is electrically connected with the second end of the second resistor; the second end of the first capacitor is grounded.
6. The sensitivity frequency characteristic adjusting circuit according to claim 3, wherein the high-pass filter circuit includes:
a second capacitor; the first end of the second capacitor is electrically connected with the output end of the third voltage follower,
the first end of the third resistor is electrically connected with the second end of the second capacitor; the second end of the third resistor is grounded.
7. The sensitivity frequency characteristic adjusting circuit according to claim 4, wherein the second low-pass filter circuit includes:
a fifth resistor; the first end of the fifth resistor is electrically connected with the output end of the fifth voltage follower,
the first end of the third capacitor is electrically connected with the second end of the fifth resistor; the second end of the third capacitor is grounded.
8. The circuit of any one of claims 1-7, further comprising an operational amplifier electrically connected to the output of the signal combining block, the output of the signal combining block being electrically connected to an inverting input of the operational amplifier, the non-inverting input of the operational amplifier being grounded.
9. A vibration sensor comprising a vibration sensor body and the sensitivity frequency characteristic adjusting circuit according to any one of claims 1 to 8 electrically connected to the vibration sensor body.
10. A sensor comprising a sensor body and the sensitivity frequency characteristic adjustment circuit according to any one of claims 1 to 8 electrically connected to the sensor body.
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