CN111308116B - Inductive rotating speed sensor signal measuring device and measuring method - Google Patents
Inductive rotating speed sensor signal measuring device and measuring method Download PDFInfo
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- CN111308116B CN111308116B CN201911192194.9A CN201911192194A CN111308116B CN 111308116 B CN111308116 B CN 111308116B CN 201911192194 A CN201911192194 A CN 201911192194A CN 111308116 B CN111308116 B CN 111308116B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
- G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
- G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/26—Modifications of amplifiers to reduce influence of noise generated by amplifying elements
Abstract
The invention discloses a signal measuring device of an inductive rotating speed sensor, which is respectively connected with a self-checking signal and the inductive rotating speed sensor, and comprises a double-phase carrier generating circuit connected with the input end of the inductive rotating speed sensor, an amplitude modulation signal amplifying circuit, an amplitude modulation signal detecting circuit, a hysteresis comparison circuit and a signal level conversion circuit which are sequentially connected with the output end of the inductive rotating speed sensor; the double-phase carrier wave generating circuit is connected with a self-checking signal. The inductance change frequency of the inductance type rotating speed sensor is modulated on a carrier wave to generate an amplitude modulation signal, the amplitude modulation signal is amplified through an amplitude modulation signal amplifying circuit, a pulse signal which can be collected by a computer is normalized through detection and signal level conversion, and the rotating speed is measured by measuring the frequency of the pulse signal. The invention abandons the bridge type measuring principle commonly adopted by the traditional inductive sensor, does not use a transformer as a part of a measuring circuit any more, and reduces the size, the weight and the power consumption of the circuit.
Description
Technical Field
The invention relates to the technical field of rotating speed measurement, in particular to a signal measuring device and a signal measuring method of an inductive rotating speed sensor.
Background
The rotation speed measurement plays a very important role in industry, agriculture and daily life of people, and a rotation speed sensor is widely applied as a rotation speed measuring instrument. The most extensive classification methods of the existing rotating speed sensors include magnetoelectric rotating speed sensors, photoelectric rotating speed sensors and Hall rotating speed sensors. Each sensor has its particular applicability and its limitations. The magnetoelectric rotation speed sensor is manufactured by applying the principle that a magnetizer rotates in a magnetic field to generate induced electromotive force, the induced electromotive force is in direct proportion to the rotation speed, and the rotation speed is reflected by measuring the electromotive force. The magnetoelectric revolution speed transducer has higher manufacturing cost and the signal is easy to be interfered by an external magnetic field. At present, the traditional inductive rotating speed sensor generally adopts a bridge type measuring principle, a transformer is used as a part of a measuring circuit, and the size, the weight and the power consumption of the circuit are all larger, so that the miniaturization of the measuring circuit is not facilitated. The traditional measuring circuit does not have a self-detection function, cannot realize the self-detection of the circuit, and cannot realize the on-line detection of the sensor.
Disclosure of Invention
The invention aims to provide a signal measuring device of an inductive rotating speed sensor, which abandons the bridge type measuring principle commonly adopted by the traditional inductive sensor, does not use a transformer as a part of a measuring circuit any more, and greatly reduces the size, the weight and the power consumption of the circuit.
The invention is realized by the following technical scheme:
an inductance type rotating speed sensor signal measuring device is respectively connected with a self-checking signal and an inductance type rotating speed sensor, and comprises a double-phase carrier generating circuit connected with the input end of the inductance type rotating speed sensor, an amplitude modulation signal amplifying circuit, an amplitude modulation signal detecting circuit, a hysteresis comparison circuit and a signal level conversion circuit which are sequentially connected with the output end of the inductance type rotating speed sensor; the double-phase carrier wave generating circuit is connected with a self-checking signal.
Furthermore, in order to better implement the present invention, the dual-phase carrier generation circuit includes a sinusoidal signal generator connected to the self-test signal, an amplifier U1 connected to the sinusoidal signal generator, and an amplifier U2, wherein an output terminal of the amplifier U1 and an output terminal of the amplifier U2 are respectively connected to the inductive rotation speed sensor; the non-inverting input end of the amplifier U1 is connected with a pin UOA of the sine signal generator; the reverse input end of the amplifier U1 is further connected with a resistor R1 and a capacitor C1, the other ends of the resistor R1 and the capacitor C1 are connected with the output end of the amplifier U1, and a resistor R2 is connected between the output end of the amplifier U1 and the connection of the inductive rotating speed sensor.
Further, for better implementation of the present invention, the inverting input terminal of the amplifier U2 is connected to the pin UOB of the sinusoidal signal generator; the reverse input end of the amplifier U2 is connected with a resistor R3 and a capacitor C2, the other ends of the resistor R3 and the capacitor C2 are connected with the output end of the amplifier U2, and the output end of the amplifier U2 is connected with an inductive speed sensor and is connected with a resistor R4; a resistor R5 is arranged between the inverting input end of the amplifier U2 and a pin UOB of the sinusoidal signal generator; the positive input end of the amplifier U2 is connected with a resistor R6, and the other end of the resistor R6 is grounded.
Further, in order to better implement the present invention, the amplitude modulation signal amplifying circuit comprises an amplifier U3 connected with the positive input end and the inductive speed sensor, a resistor R9 connected with the negative input end of the amplifier U3, and a resistor R7 respectively connected with the negative input end and the output end of the amplifier U3.
Further, in order to better implement the present invention, the amplitude modulation signal detection circuit includes a diode D1 having an anode connected to the output terminal of the amplifier U3, a capacitor C3 and a resistor R8 connected to cathodes of the diode, respectively, the other end of the capacitor C3 and the other end of the resistor R8 are both grounded, and a cathode of the diode is connected to the hysteresis comparison circuit as the output terminal.
Furthermore, in order to better realize the invention, the hysteresis comparison circuit comprises resistors R10-R14, a capacitor C4 and an amplifier U4; one end of the resistor R10 is connected with the cathode of the diode D1, the other end of the resistor R10 is connected with one end of the capacitor C4 and the reverse input end of the amplifier U4, the forward input end of the amplifier U4 is connected with one end of the resistor R13 and one end of the resistor R14, the other end of the resistor R13 is connected with the resistor R11 and the resistor R12, and the other end of the resistor R14 is connected with the output end of the amplifier U4.
Further, in order to better implement the present invention, the signal level conversion circuit includes a resistor R16, a resistor R117, a diode D2, and a transistor Q1; the output end of the amplifier U4 is further connected with one end of a resistor R16, the other end of the resistor R16 is respectively connected with the base of the triode Q1 and the negative electrode of the diode D2, the emitter of the triode Q1 and the positive electrode of the diode D2 are both grounded, and the collector of the triode Q1 is connected with the resistor R17 and outputs a pulse signal.
The measuring method of inductive rotating speed sensor signal measuring device is characterized by that the inductance change frequency of inductive rotating speed sensor is modulated on a carrier wave to produce amplitude-modulated signal, then the amplitude-modulated signal is amplified by means of amplitude-modulated signal amplification circuit, and then the amplified amplitude-modulated signal is undergone the processes of detection and signal level conversion to obtain pulse signal which can be collected by computer, and the measuring of rotating speed can be implemented by means of measuring frequency of pulse signal.
Further, in order to better implement the invention, the method specifically comprises the following steps:
step S1: the two-phase carrier generating circuit generates two paths of sine carrier signals with phase difference of 180 degrees and the same peak-peak value, and the carrier signals act on the sensing element of the inductive rotating speed sensor;
step S2: modulating the inductance change frequency of the inductance type rotating speed sensor on a carrier to generate an amplitude modulation signal;
step S3: amplifying the double-side envelope of the amplitude-modulated signal by an amplitude-modulated signal amplifying circuit;
step S4: the amplitude modulation signal detection circuit performs single-side envelope detection on an output signal of the amplitude modulation signal amplification circuit;
step S5: the hysteresis comparison circuit compares the voltage of the output signal of the amplitude-modulated signal detection circuit to form a square wave signal;
step S5: the signal level conversion circuit performs level conversion on the output signal of the hysteresis comparison circuit, and the output signal is subjected to waveform amplification and shaping to form a pulse signal for the computer to collect.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) the invention abandons the bridge type measuring principle commonly adopted by the traditional inductive sensor, does not use a transformer as a part of a measuring circuit any more, and the reliability of the circuit is not influenced by the low reliability index of the transformer any more, thus greatly improving the reliability;
(2) the invention greatly reduces the size, weight and power consumption of the circuit, and the circuit integration is easier to realize.
Drawings
FIG. 1 is a functional block diagram of the present invention;
FIG. 2 is a schematic diagram of a dual phase carrier generation circuit according to the present invention;
FIG. 3 is a schematic diagram of an AM signal amplifying circuit and an AM signal detecting circuit according to the present invention;
FIG. 4 is a schematic diagram of a hysteresis comparator and a signal level converter according to the present invention;
FIG. 5 is a waveform diagram of an output signal of the amplitude modulated signal amplifying circuit according to the present invention;
FIG. 6 is a waveform diagram of the output signal of the amplitude modulated signal detection circuit of the present invention;
FIG. 7 is a waveform diagram of the output signal of the hysteresis comparator circuit according to the present invention;
fig. 8 is a waveform diagram of an output signal of the signal level conversion circuit in the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.
Example 1:
the invention is realized by the following technical scheme, as shown in figures 1-8, an inductive rotating speed sensor signal measuring device is respectively connected with a self-checking signal and an inductive rotating speed sensor, and comprises a double-phase carrier generating circuit connected with the input end of the inductive rotating speed sensor, an amplitude modulation signal amplifying circuit, an amplitude modulation signal detecting circuit, a hysteresis comparing circuit and a signal level converting circuit which are sequentially connected with the output end of the inductive rotating speed sensor; the double-phase carrier wave generating circuit is connected with a self-checking signal.
It should be noted that, through the above improvement, as shown in fig. 1, the inductive tachometer signal measuring device provided by the present invention includes a dual-phase carrier generating circuit, an amplitude modulation signal amplifying circuit, an amplitude modulation signal detecting circuit, a hysteresis comparing circuit and a signal level converting circuit, which are sequentially connected in series on the same circuit to form the inductive tachometer signal measuring device, wherein the dual-phase carrier generating circuit generates two sinusoidal carrier signals with 180 ° phase difference and the same peak-to-peak value, and the sinusoidal carrier signals are applied to the sensitive element of the inductive tachometer; the inductance change frequency of the inductance type rotating speed sensor is modulated on a carrier wave to generate an amplitude modulation signal, then the amplitude modulation signal is amplified through an amplitude modulation signal amplifying circuit, an amplitude modulation signal detecting circuit carries out single-side envelope detection on an output signal of the amplitude modulation signal amplifying circuit, a hysteresis comparing circuit carries out voltage comparison on the output signal of the amplitude modulation signal detecting circuit to form a square wave signal, a signal level converting circuit carries out level conversion on the output signal of the hysteresis comparing circuit, and a pulse signal which can be collected by a computer is formed through waveform amplification and shaping regulation.
The inductance change frequency of the inductance type rotating speed sensor is modulated on a carrier wave to generate an amplitude modulation signal, then the amplitude modulation signal is amplified through an amplitude modulation signal amplifying circuit, and then the amplitude modulation signal is normalized into a pulse signal which can be collected by a computer through detection and signal level conversion, and the rotating speed is measured by measuring the frequency of the pulse signal.
Example 2:
the present embodiment is further optimized based on the above embodiments, as shown in fig. 2, and further, in order to better implement the present invention, the dual-phase carrier generation circuit includes a sinusoidal signal generator connected to the self-test signal, an amplifier U1 connected to the sinusoidal signal generator, and an amplifier U2, where an output terminal of the amplifier U1 and an output terminal of the amplifier U2 are respectively connected to the inductive speed sensor; the non-inverting input end of the amplifier U1 is connected with a pin UOA of the sine signal generator; the reverse input end of the amplifier U1 is further connected with a resistor R1 and a capacitor C1, the other ends of the resistor R1 and the capacitor C1 are connected with the output end of the amplifier U1, and a resistor R2 is connected between the output end of the amplifier U1 and the connection of the inductive rotating speed sensor.
It should be noted that, with the above improvement, the sine signal generator has the pin R1, the pin R2, the pin EXT, and the pin + VSpin-VSPin VOD, two pins UOA, pin UOB, two pins NC and pin GND; wherein pin R1 is connected with resistance R401, and resistance R401's other one end ground connection, self-checking control signal is connected with pin EXT.
Other parts of this embodiment are the same as those of the above embodiment, and thus are not described again.
Example 3:
this embodiment is further optimized on the basis of the above embodiment, as shown in fig. 2, and further, in order to better implement the present invention, the inverting input terminal of the amplifier U2 is connected to the pin UOB of the sinusoidal signal generator; the reverse input end of the amplifier U2 is connected with a resistor R3 and a capacitor C2, the other ends of the resistor R3 and the capacitor C2 are connected with the output end of the amplifier U2, and the output end of the amplifier U2 is connected with an inductive speed sensor and is connected with a resistor R4; a resistor R5 is arranged between the inverting input end of the amplifier U2 and a pin UOB of the sinusoidal signal generator; the positive input end of the amplifier U2 is connected with a resistor R6, and the other end of the resistor R6 is grounded.
Further, in order to better implement the invention, the amplitude modulation signal amplifying circuit comprises an amplifier U3 connected with a forward input end and an inductive rotating speed sensor, a resistor R9 connected with a reverse input end of the amplifier U3, and a resistor R7 respectively connected with a reverse input end and an output end of the amplifier U3; the other end of the resistor R9 is grounded.
Further, in order to better implement the present invention, the amplitude modulation signal detection circuit includes a diode D1 having an anode connected to the output terminal of the amplifier U3, a capacitor C3 and a resistor R8 connected to cathodes of the diode, respectively, the other end of the capacitor C3 and the other end of the resistor R8 are both grounded, and a cathode of the diode is connected to the hysteresis comparison circuit as the output terminal.
Furthermore, in order to better realize the invention, the hysteresis comparison circuit comprises resistors R10-R14, a capacitor C4 and an amplifier U4; one end of the resistor R10 is connected with the cathode of the diode D1, the other end of the resistor R10 is connected with one end of the capacitor C4 and the reverse input end of the amplifier U4, the forward input end of the amplifier U4 is connected with one end of the resistor R13 and one end of the resistor R14, the other end of the resistor R13 is connected with the resistor R11 and the resistor R12, and the other end of the resistor R14 is connected with the output end of the amplifier U4.
Further, in order to better implement the present invention, the signal level conversion circuit includes a resistor R16, a resistor R117, a diode D2, and a transistor Q1 connected to an output section of the amplifier U4; the other end of the resistor R16 is respectively connected with the base of the triode Q1 and the cathode of the diode D2, the emitter of the triode Q1 and the anode of the diode D2 are both grounded, and the collector of the triode Q1 is connected with the resistor R17 and outputs a pulse signal.
It should be noted that, through the above improvement, the two-phase carrier generating circuit shown in fig. 2 generates two sinusoidal carrier signals with phase difference of 180 ° and the same peak-to-peak value, and the two carrier signals act on the sensing element of the inductive sensor. The sensing element of the inductive sensor is formed by connecting a fixed inductor and a dynamic inductor which changes along with the rotating speed in series, a sine carrier signal acts on two end points of the sensing element, the common connecting end of the fixed inductor and the moving inductor is used as a sampling point of a rotating speed amplitude modulation signal, the inductance change frequency of the inductance type rotating speed sensor is modulated on a carrier wave, then the weak amplitude modulation signal is amplified by the amplitude modulation signal amplifying circuit shown in fig. 3, the amplitude modulation signal detecting circuit performs single-side envelope detection on the output signal of the amplitude modulation signal amplifying circuit, the hysteresis comparator circuit of fig. 5 compares the voltage of the output signal of the amplitude modulated signal detector circuit of fig. 4, forming a square wave signal, the signal level conversion circuit shown in fig. 5 performs level conversion on the output signal of the hysteresis comparison circuit, and the output signal is converted into a pulse signal which can be collected by a computer through the level conversion circuit.
When the rotation speed is not high, the envelope curve of the carrier signal is a straight line, and the hysteresis comparison circuit does not generate level inversion as shown in fig. 4.
When the rotating speed exists, the inductance of the starting inductor is caused to change, the change directly causes the waveform of a sampling point signal of an amplitude modulation signal of the sensor to change, and at the moment, the envelope curve of the sinusoidal carrier signal is not a straight line any more, but an amplitude modulation signal changing along with the rotating speed.
After passing through the am signal amplifying circuit shown in fig. 3, the am signal is amplified to an am signal having a double-sided envelope shown in fig. 6, which can be detected by the am signal detecting circuit shown in fig. 3 without waveform distortion.
The amplitude modulated signal detection circuit shown in fig. 4 detects the amplitude modulated signal, leaving a positive half cycle envelope signal of the signal shown in fig. 6, which is input to the hysteresis comparison circuit shown in fig. 4. The hysteresis comparator circuit of fig. 4 has been set to an inverted comparison level according to the signal parameters, and when the signal amplitude is above the upper limit level, the hysteresis comparator circuit of fig. 4 produces a positive level output, and when the signal amplitude is below the lower limit level, the hysteresis comparator circuit produces a negative level output, so that the change in the speed sensed by the speed sensor has been converted into a pulse signal as shown in fig. 7. To facilitate the processing of the digital circuit, the output of the hysteresis comparator circuit shown in fig. 4 is converted into the digital circuit level shown in fig. 8 by the signal level conversion circuit.
In order to realize the self-detection of the circuit and the rotation speed sensor, when the rotation speed is not available, the envelope curve of the carrier signal is a straight line, the level inversion of the hysteresis comparison circuit cannot be caused, after the pulse of the self-detection control signal in fig. 2 is applied, the envelope curve of the carrier signal is also changed after the peak-to-peak value of one path of signal of the two-phase carrier generation circuit shown in fig. 2 is changed, the level inversion of the hysteresis comparison circuit shown in fig. 4 is caused, and the self-detection of the circuit and the sensor can be realized by detecting whether the pulse signal is generated or not.
Other parts of this embodiment are the same as those of the above embodiment, and thus are not described again.
Example 4:
the present embodiment is further optimized based on the above embodiments, as shown in fig. 1 to 8, a measuring method of an inductive tachometer signal measuring apparatus modulates the inductance variation frequency of an inductive tachometer onto a carrier to generate an amplitude modulation signal, then amplifies the amplitude modulation signal by an amplitude modulation signal amplifying circuit, and then normalizes the amplitude modulation signal into a pulse signal for a computer to collect through detection and signal level conversion, and the measurement of the tachometer is realized by measuring the frequency of the pulse signal.
Further, in order to better implement the invention, the method specifically comprises the following steps:
step S1: the two-phase carrier generating circuit generates two paths of sine carrier signals with phase difference of 180 degrees and the same peak-peak value, and the carrier signals act on the sensing element of the inductive rotating speed sensor;
step S2: modulating the inductance change frequency of the inductance type rotating speed sensor on a carrier to generate an amplitude modulation signal;
step S3: amplifying the double-side envelope of the amplitude-modulated signal by an amplitude-modulated signal amplifying circuit;
step S4: the amplitude modulation signal detection circuit performs single-side envelope detection on an output signal of the amplitude modulation signal amplification circuit;
step S5: the hysteresis comparison circuit is used for comparing the voltage of the output signal of the amplitude-modulated signal detection circuit to form a square wave signal;
step S5: the signal level conversion circuit performs level conversion on the output signal of the hysteresis comparison circuit, and the output signal is subjected to waveform amplification and shaping to form a pulse signal for the computer to collect.
It should be noted that, through the above improvement, the inductance change frequency of the inductive rotating speed sensor is modulated on a carrier wave by using the modulation and demodulation principle to generate an amplitude modulation signal, then the amplitude modulation signal is amplified by an amplitude modulation signal amplifying circuit, and then a pulse signal for computer acquisition is normalized through detection and signal level conversion, and the rotating speed measurement is realized by measuring the frequency of the pulse signal. The invention abandons the bridge type measuring principle commonly adopted by the traditional inductive sensor, does not use a transformer as a part of the measuring circuit any more, has the reliability not influenced by the low reliability index of the transformer any more, can greatly improve the reliability, greatly reduces the size, the weight and the power consumption of the circuit at the same time, and is easier to realize the circuit integration. In order to further improve the reliability of the circuit and reduce the size of the circuit, the circuit can be integrated by using a thick film integrated circuit technology, and the reliability of the circuit can be greatly improved again through strict quality control processes of production, test, screening and the like of the thick film integrated circuit technology.
Other parts of this embodiment are the same as those of the above embodiment, and thus are not described again.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.
Claims (7)
1. The utility model provides an inductance type speed sensor signal measurement device, is connected its characterized in that with self-checking signal, inductance type speed sensor respectively: the device comprises a double-phase carrier generating circuit connected with the input end of an inductive rotating speed sensor, an amplitude modulation signal amplifying circuit, an amplitude modulation signal detecting circuit, a hysteresis comparing circuit and a signal level converting circuit, wherein the amplitude modulation signal amplifying circuit, the amplitude modulation signal detecting circuit, the hysteresis comparing circuit and the signal level converting circuit are sequentially connected with the output end of the inductive rotating speed sensor; the double-phase carrier wave generating circuit is connected with a self-checking signal;
the double-phase carrier generating circuit comprises a sinusoidal signal generator connected with a self-checking signal, an amplifier U1 connected with the sinusoidal signal generator and an amplifier U2, wherein the output end of the amplifier U1 and the output end of the amplifier U2 are respectively connected with an inductive rotating speed sensor; the positive input end of the amplifier U1 is connected with a pin UOA of a sinusoidal signal generator; the reverse input end of the amplifier U1 is also connected with a resistor R1 and a capacitor C1, the other ends of the resistor R1 and the capacitor C1 are connected with the output end of the amplifier U1, and a resistor R2 is connected between the output end of the amplifier U1 and the connection of the inductive speed sensor;
the inverting input end of the amplifier U2 is connected with a pin UOB of the sinusoidal signal generator; the reverse input end of the amplifier U2 is connected with a resistor R3 and a capacitor C2, the other ends of the resistor R3 and the capacitor C2 are connected with the output end of the amplifier U2, and the output end of the amplifier U2 is connected with an inductive speed sensor and is connected with a resistor R4; a resistor R5 is arranged between the inverting input end of the amplifier U2 and a pin UOB of the sinusoidal signal generator; the positive input end of the amplifier U2 is connected with a resistor R6, and the other end of the resistor R6 is grounded.
2. The inductive tachometer signal measuring apparatus of claim 1, wherein: the amplitude modulation signal amplifying circuit comprises an amplifier U3 connected with a forward input end and the inductive rotating speed sensor, a resistor R9 connected with a reverse input end of the amplifier U3, and a resistor R7 respectively connected with the reverse input end and the output end of the amplifier U3.
3. The inductive tachometer signal measuring apparatus of claim 2, wherein: the amplitude modulation signal detection circuit comprises a diode D1, a capacitor C3 and a resistor R8, wherein the anode of the diode D1 is connected with the output end of an amplifier U3, the capacitor C3 and the resistor R8 are respectively connected with the cathode of the diode, the other end of the capacitor C3 and the other end of the resistor R8 are grounded, and the cathode of the diode serving as the output end is connected with the hysteresis comparison circuit.
4. The inductive tachometer signal measuring apparatus of claim 3, wherein: the hysteresis comparison circuit comprises resistors R10-R14, a capacitor C4 and an amplifier U4; one end of the resistor R10 is connected with the cathode of the diode D1, the other end of the resistor R10 is connected with one end of the capacitor C4 and the reverse input end of the amplifier U4, the forward input end of the amplifier U4 is connected with one end of the resistor R13 and one end of the resistor R14, the other end of the resistor R13 is connected with the resistor R11 and the resistor R12, and the other end of the resistor R14 is connected with the output end of the amplifier U4.
5. The inductive tachometer signal measuring apparatus of claim 4, wherein: the signal level conversion circuit comprises a resistor R16, a resistor R117, a diode D2 and a triode Q1; the output end of the amplifier U4 is further connected with one end of a resistor R16, the other end of the resistor R16 is respectively connected with the base of the triode Q1 and the negative electrode of the diode D2, the emitter of the triode Q1 and the positive electrode of the diode D2 are both grounded, and the collector of the triode Q1 is connected with the resistor R17 and outputs a pulse signal.
6. The method of measuring an inductive tachometer signal measuring apparatus according to any one of claims 1 to 5, wherein: the inductance change frequency of the inductance type rotating speed sensor is modulated on a carrier wave to generate an amplitude modulation signal, then the amplitude modulation signal is amplified through an amplitude modulation signal amplifying circuit, and then the amplitude modulation signal is normalized into a pulse signal which can be collected by a computer through detection and signal level conversion, and the rotating speed is measured by measuring the frequency of the pulse signal.
7. The method of claim 6, wherein the inductive tachometer signal measuring apparatus comprises:
the method specifically comprises the following steps:
step S1: the two-phase carrier generating circuit generates two paths of sine carrier signals with phase difference of 180 degrees and the same peak-peak value, and the carrier signals act on the sensing element of the inductive rotating speed sensor;
step S2: modulating the inductance change frequency of the inductance type rotating speed sensor on a carrier to generate an amplitude modulation signal;
step S3: amplifying the double-side envelope of the amplitude-modulated signal by an amplitude-modulated signal amplifying circuit;
step S4: the amplitude modulation signal detection circuit performs single-side envelope detection on an output signal of the amplitude modulation signal amplification circuit;
step S5: the hysteresis comparison circuit is used for comparing the voltage of the output signal of the amplitude-modulated signal detection circuit to form a square wave signal;
step S5: the signal level conversion circuit performs level conversion on the output signal of the hysteresis comparison circuit, and the output signal is subjected to waveform amplification and shaping to form a pulse signal for the computer to collect.
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