CN216351208U - Signal processing system and equipment of electromagnetic distance measuring sensor - Google Patents

Abstract

The utility model provides a signal processing system and device of an electromagnetic distance measuring sensor, comprising: the device comprises an electromagnetic wave transmitting module, an electromagnetic wave receiving module, an analog-to-digital converter, a driving module and a processor. The electromagnetic wave emission module is connected with the driving module and used for emitting ranging electromagnetic waves based on the excitation square wave signals output by the driving module; the electromagnetic wave receiving module is connected with the analog-to-digital converter and used for receiving the reflected electromagnetic waves; the analog-to-digital converter is connected with the driving module and used for converting the electromagnetic waves received by the electromagnetic wave receiving module from analog signals into digital signals and sending the digital signals to the processor through the driving module; the processor is used for processing the digital signals sent by the analog-to-digital converter and outputting result data. The digital circuit design and the modular structure are adopted, so that the hardware circuit of the whole system is simpler, the system reliability and the intelligent level are higher, the system hardware area is smaller, and the power consumption is lower.

Description

Signal processing system and equipment of electromagnetic distance measuring sensor

Technical Field

The present application relates to the field of signal processing technologies, and in particular, to a signal processing system and device for an electromagnetic distance measuring sensor.

Background

The electromagnetic wave distance measurement is widely applied to various production and living scenes, the precision is different, but the principle and the method are mostly consistent.

The existing processing system for detecting electromagnetic type double or more coil sensor signals generally adopts an analog circuit, sends out electromagnetic waves through a transmitting coil, receives reflected electromagnetic waves through a receiving coil, and measures the distance according to the time difference or phase difference between the transmission and the reception. However, the analog signal circuit adopted by such a signal processing system has a complex structure, high system power consumption and a large area, and the analog circuit cannot be flexibly adjusted and needs manual adjustment.

Therefore, there is a need for a modular device for preprocessing and adjusting transmitted and received electromagnetic waves, improving the reliability and intelligence level of the device, simplifying the entire signal processing system, saving hardware resources, and reducing system area and power consumption.

SUMMERY OF THE UTILITY MODEL

The application provides an electromagnetic detection sensor's signal processing system and equipment to solve the problem that the circuit is complicated among the prior art, the consumption is high, and intelligent level is low, adjusts the inflexibility.

The technical scheme provided by the application is as follows:

in one aspect, a signal processing system for an electromagnetic ranging sensor, comprising: the device comprises an electromagnetic wave transmitting module, an electromagnetic wave receiving module, an analog-to-digital converter, a driving module and a processor;

the electromagnetic wave emission module is connected with the driving module and used for emitting ranging electromagnetic waves based on the excitation square wave signals output by the driving module;

the electromagnetic wave receiving module is connected with the analog-to-digital converter and used for receiving reflected electromagnetic waves;

the analog-to-digital converter is connected with the driving module and used for converting the electromagnetic waves received by the electromagnetic wave receiving module from analog signals into digital signals and sending the digital signals to the processor through the driving module;

the processor is used for processing the digital signals sent by the analog-to-digital converter and outputting result data.

Optionally, the electromagnetic wave emitting module includes: the transmitting coil and the excitation circuit are used for receiving the excitation square waves output by the driving module; the electromagnetic wave receiving module comprises: the device comprises a receiving coil and a pre-stage amplifying circuit for preprocessing a received signal; the driving module comprises an FPGA and a direct memory access controller allowing hardware with different speeds to directly communicate; the processor comprises: RISC microprocessor.

Optionally, the system further comprises a compensation module which is controlled by the processor, connected with the electromagnetic wave receiving module and used for being matched with the microprocessor to remove background signal interference of the receiving coil.

Optionally, the compensation module includes a compensation coil and a zero setting circuit controlled by the processor and used for adjusting the compensation signal.

Optionally, the system further comprises a phase modulation module controlled by the processor and connected to the electromagnetic wave receiving module, for ensuring that the phase of the induction signal required by the system is consistent with that of the pulse square wave.

Optionally, the phase modulation module includes an addition circuit for adding the output signal of the compensation module and the output signal of the receiving module, and a phase modulation circuit controlled by the processor.

Optionally, the zero setting circuit includes a first digital potentiometer and a second digital potentiometer, which are used for forming two paths of signals with opposite phases and controlling amplitudes of the two paths of signals by the processor.

Optionally, the phase modulation circuit control terminal includes a third digital potentiometer for controlling the amplitude of the phase modulation module signal by the processor.

On the one hand, the signal processing device of the electromagnetic ranging sensor comprises the signal processing system of the electromagnetic detection sensor in any one of the above technical schemes.

The technical scheme provided by the application can comprise the following beneficial effects: the modularized and digital circuit is adopted to match with the combination of the driving module and the processor, so that the whole system circuit is simpler, the system reliability and the intelligent level are higher, and meanwhile, the system hardware area is smaller and the power consumption is lower.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.

Fig. 1 is a schematic diagram of a signal processing system of an electromagnetic detection sensor according to the present embodiment;

fig. 2 is a circuit diagram of a signal processing device of an electromagnetic detection sensor according to the present embodiment.

Reference numerals: 1-an electromagnetic wave emission module; 2-an electromagnetic wave receiving module; 3-an analog-to-digital converter; 4-a drive module; 5-a processor; 6-a compensation module; 7-phase modulation module.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

With reference to fig. 1 and fig. 2, the present embodiment provides a signal processing system of an electromagnetic detection sensor, including:

the system comprises an electromagnetic wave transmitting module 1, an electromagnetic wave receiving module 2, an analog-to-digital converter 3, a driving module 4 and a processor 5;

the electromagnetic wave emission module 1 is connected with the driving module 4 and is used for emitting ranging electromagnetic waves based on excitation square wave signals output by the driving module 4;

the electromagnetic wave receiving module 2 is connected with the analog-to-digital converter 3 and is used for receiving reflected electromagnetic waves;

the analog-to-digital converter 3 is connected with the driving module 4, and is configured to convert the electromagnetic waves received by the electromagnetic wave receiving module from analog signals into digital signals, and send the digital signals to the processor 5 through the driving module 4;

the processor 5 is configured to process the digital signal sent by the analog-to-digital converter 3 and output result data.

The driving module outputs an excitation square wave signal as an excitation source to drive a transmitting coil in an electromagnetic wave transmitting module to emit electromagnetic waves, the electromagnetic waves are reflected by a measured object and then received by a receiving coil in an electromagnetic wave receiving module, the driving module collects data which are received by the electromagnetic wave receiving module and converted into digital signals by an analog-to-digital converter, the collected data are transmitted to a processor in a ping-pong mode, the processor filters the data, the operations such as interference removal and the like are removed, and finally, a distance signal is output according to the amplitude and the distance of the signal for result display.

The specific embodiment can have the following beneficial effects: the modularized and digital circuit is adopted to match with the combination of the driving module and the processor, so that the whole system circuit is simpler, the system reliability and the intelligent level are higher, and meanwhile, the system hardware area is smaller and the power consumption is lower.

In a preferred embodiment, the electromagnetic wave emitting module 1 comprises: the transmitting coil and the excitation circuit are used for receiving the excitation square wave output by the driving module 4; the electromagnetic wave receiving module 2 comprises: the device comprises a receiving coil and a pre-stage amplifying circuit for preprocessing a received signal; the driving module 4 comprises an FPGA and a direct memory access controller which allows hardware with different speeds to directly communicate; the processor 5 comprises: RISC microprocessor.

By the arrangement, the RISC processor can effectively reduce power consumption, reduce circuit complexity and better complete module functions.

In the preferred embodiment, the device further comprises a compensation module 6 which is controlled by the processor 5 and connected with the electromagnetic wave receiving module 2 and is used for removing background signal interference of the receiving coil in cooperation with the processor.

So set up, compensation coil in compensation module 6 forms two routes opposite phase's signal with the signal received, adjusts through microprocessor, controls the range of two routes of signals, synthesizes one and the receiving coil signal amplitude equals, and the signal of opposite phase can realize the elimination to coil background signal to remove the interference of background signal.

In a preferred embodiment, the compensation module 6 comprises a compensation coil and a zeroing circuit controlled by the processor for adjusting the compensation signal.

So set up, the zero setting circuit of processor control can be with compensation coil output signal phase place and amplitude more accurate.

In the preferred embodiment, the system further comprises a phase modulation module 7 which is controlled by the processor 5 and connected with the electromagnetic wave receiving module 2, and is used for ensuring that the induction signal required by the system is consistent with the phase of the pulse square wave.

So set up, when the sensor is markd, treater 5 carries out the phase modulation control to the signal, guarantees that the required induction signal of system is unanimous with pulse square wave phase place, reduces the error, guarantees the precision, strengthens system interference killing feature.

In a preferred embodiment, the phase modulation module 7 comprises an adding circuit for adding the output signal of the compensation module and the output signal of the receiving module, and a phase modulation circuit controlled by the processor.

So set up, the treater control phase modulation circuit can accurate control phase modulation circuit output signal's amplitude and phase place, guarantees the required induction signal of system and pulse square wave phase uniformity.

In a preferred embodiment, the zero setting circuit in the compensation module 6 includes a first digital potentiometer and a second digital potentiometer for forming two opposite phase signals and controlling the amplitudes of the two signals by the processor 5.

By the arrangement, the digital potentiometer has the advantages of high adjustable precision, long service life and capability of utilizing the characteristic that the output feedback signal is linearly proportional to the angle change, and the output adjusting function is realized by driving the rotating shaft. Through adopting digital potentiometer, the control zero setting circuit output signal's that can be more accurate range is littleer than the system use analog circuit control error, and the degree of accuracy is higher, promotes system's precision.

In a preferred embodiment, the phase modulation circuit control terminal of the phase modulation module 7 comprises a third digital potentiometer for controlling the amplitude of the phase modulation module signal by the processor 5.

By the arrangement, the digital potentiometer has the advantages of high adjustable precision, long service life and capability of utilizing the characteristic that the output feedback signal is linearly proportional to the angle change, and the output adjusting function is realized by driving the rotating shaft. Through adopting digital potentiometer, the amplitude of the phase modulation signal can be controlled more accurately, and the system uses an analog circuit to control the error to be smaller and the accuracy is higher.

Referring to fig. 2, the present embodiment further provides a signal processing apparatus of an electromagnetic detection sensor, including the signal processing system of the electromagnetic detection sensor according to any of the above technical solutions.

The working process is as follows: the drive module adopts an FPGA (drive module 4) to output an excitation square wave signal as an excitation source to drive a power amplifier circuit to excite a sensor transmitting coil, the FPGA + AD (analog-to-digital converter 3) collects data amplified by a sensor front stage, the collected data is transmitted to a processor through a DMA (direct memory access) in a ping-pong mode, the processor is responsible for filtering the data, removing interference, adjusting phases, zeroing and the like, and finally, the signal amplitude corresponds to the distance to output a distance signal.

The FPGA outputs pulse square waves to drive a power amplifier circuit to excite a transmitting coil, the FPGA controls an AD acquisition receiving coil to amplify and phase-modulate signals, calculates the phase difference between the signals and the pulse square waves, and finally transmits the acquired signals and the calculated phase difference to an ARM (advanced RISC machine) through DMA (direct memory access) in a ping-pong mode. The ARM carries out band-pass filtering on the received signals, removes clutter signals, carries out wavelet analysis, attenuates the signals inconsistent with the phase of the FPGA pulse square waves, can reduce interference signals inconsistent with induction signals, and guarantees the measuring precision.

A signal received by the compensation coil is subjected to 180-degree reversal through the operational amplifier OP4, the resistors R9 and R10 in one path, the signal is synthesized through the first digital potentiometer and the second digital potentiometer in the other path, the ARM controls the amplitudes of the two paths of signals through regulating the digital potentiometers, a signal which is equal to the amplitude of the signal of the receiving coil and opposite in phase is synthesized, and the signal can eliminate the background signal of the coil through an adding circuit formed by the operational amplifier OP2, the resistors R5, R3 and the capacitor C2, so that the interference of the background signal is eliminated. The third digital potentiometer, the capacitor C3, the operational amplifier OP3 and the resistors R6 and R4 form a phase adjusting circuit, and when the sensor is calibrated, ARM can perform phase modulation control on signals by controlling the third digital potentiometer, so that the phase of induction signals required by the system is consistent with the phase of pulse square waves.

By the arrangement, the digital circuit, the programmable logic gate array and the microprocessor are matched, so that the hardware circuit of the whole system is simpler, the reliability and the intelligence level of the system are higher, the area of the whole system is smaller, and the power consumption is lower; by adopting the compensation coil and the zero setting coil, the error can be effectively reduced by matching with the addition circuit, so that the equipment precision is higher.

It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.

It should be noted that, in the description of the present application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present application, the meaning of "a plurality" means at least two unless otherwise specified.

Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and the scope of the preferred embodiments of the present application includes other implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present application.

It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.

It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.

In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.

The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.

In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.

Claims (9)

1. A signal processing system of an electromagnetic ranging sensor, comprising:

the device comprises an electromagnetic wave transmitting module (1), an electromagnetic wave receiving module (2), an analog-to-digital converter (3), a driving module (4) and a processor (5);

the electromagnetic wave emission module (1) is connected with the driving module (4) and is used for sending out ranging electromagnetic waves based on excitation square wave signals output by the driving module (4);

the electromagnetic wave receiving module (2) is connected with the analog-to-digital converter (3) and is used for receiving reflected electromagnetic waves;

the analog-to-digital converter (3) is connected with the driving module (4) and is used for converting the electromagnetic waves received by the electromagnetic wave receiving module from analog signals into digital signals and sending the digital signals to the processor (5) through the driving module (4);

and the processor (5) is used for processing the digital signals sent by the analog-to-digital converter (3) and outputting result data.

2. The signal processing system of an electromagnetic ranging sensor according to claim 1, characterized in that said electromagnetic wave emission module (1) comprises: the transmitting coil and the excitation circuit are used for receiving the excitation square wave signal output by the driving module (4); the electromagnetic wave receiving module (2) comprises: the device comprises a receiving coil and a pre-stage amplifying circuit for preprocessing a received signal; the drive module (4) comprises an FPGA and a direct memory access controller which allows hardware with different speeds to directly communicate; the processor (5) comprises: RISC microprocessor.

3. The signal processing system of the electromagnetic distance measuring sensor according to claim 1, further comprising a compensation module (6) controlled by the processor (5) and connected to the electromagnetic wave receiving module (2) for cooperating with the microprocessor to remove background signal interference of the receiving coil.

4. The signal processing system of an electromagnetic ranging sensor according to claim 3, characterized in that the compensation module (6) comprises a compensation coil and a zeroing circuit controlled by the processor for adjusting the compensation signal.

5. The signal processing system of an electromagnetic distance measuring sensor according to claim 4, characterized by further comprising a phase modulation module (7) controlled by the processor (5) and connected to the electromagnetic wave receiving module (2) for ensuring that the system-required induction signal is in phase with the pulse square wave.

6. The signal processing system of an electromagnetic ranging sensor according to claim 5, characterized in that said phase modulation module (7) comprises an addition circuit for superimposing said compensation module output signal and the electromagnetic wave reception module (2) output signal and a phase modulation circuit controlled by a processor.

7. The signal processing system of an electromagnetic distance measuring sensor according to claim 4, characterized in that said zero setting circuit comprises a first digital potentiometer and a second digital potentiometer for forming two signals with opposite phases and controlling the amplitudes of the two signals by the processor (5).

8. The signal processing system of an electromagnetic ranging sensor according to claim 6, characterized in that said phase modulation circuit control terminal comprises a third digital potentiometer for controlling the amplitude of the phase modulation module signal by the processor (5).

9. A signal processing apparatus of an electromagnetic distance measuring sensor, characterized by comprising a signal processing system of an electromagnetic distance measuring sensor according to any of the preceding claims 1 to 8.

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