CN105865318A - Non-phase-sensitive digital demodulation system and method applied to LVDT displacement sensor - Google Patents
Non-phase-sensitive digital demodulation system and method applied to LVDT displacement sensor Download PDFInfo
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- CN105865318A CN105865318A CN201610190770.6A CN201610190770A CN105865318A CN 105865318 A CN105865318 A CN 105865318A CN 201610190770 A CN201610190770 A CN 201610190770A CN 105865318 A CN105865318 A CN 105865318A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
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Abstract
The present invention discloses a non-phase-sensitive digital demodulation system and method applied to an LVDT displacement sensor. The system comprises a pre-processing circuit for carrying out signal conditioning and analog-to-digital conversion processing on the original signal outputted by a secondary coil and obtaining a corresponding pre-processing signal, a signal filtering circuit for filtering the noise signal and/or high-frequency component in the pre-processing signal and correspondingly obtaining the DC component comprising displacement information, and an information processor for mapping the DC component by using a preset mapping database and obtaining the iron core displacement information corresponding to the DC component. The non-phase-sensitive digital demodulation system disclosed in the invention does not have any association with a phase in the process of signal demodulation processing, thus the influence on measurement precision of an iron core displacement amount by phase jitter is eliminated, and the measurement precision of the iron core displacement amount is improved.
Description
Technical field
The present invention relates to sensor technical field, be applied to the non-of LVDT displacement transducer particularly to a kind of
Phase sensitivity digital demodulation system and method.
Background technology
LVDT displacement transducer (LVDT, i.e. Linear Variable Differential Transformer, line
Property variable differential transformer) it is a kind of displacement transducer being widely used, there is simple in construction, life-span
The plurality of advantages such as length and range of linearity width.
Signal demodulation mode employed in existing LVDT displacement transducer is the most all to pass LVDT displacement
The signal of two secondary coil outputs in sensor carries out phase sensitive detection, and then utilizes phase sensitive detection result
Determine the displacement of iron core in LVDT displacement transducer.But, in actual application process, due to electricity
The reasons such as road characteristic, may there is shake in the phase place of output signal, cause the phase sensitive detection result cannot be anti-
Reflect real iron core displacement, thus cause the iron core displacement finally recorded to there is bigger error.
In sum it can be seen that how to eliminate the phase jitter shadow to the measuring accuracy of iron core displacement
Sound is current problem demanding prompt solution.
Summary of the invention
In view of this, it is an object of the invention to provide a kind of non-phase sensitivity being applied to LVDT displacement transducer
Digital demodulation system and method, eliminate the phase jitter impact on the measuring accuracy of iron core displacement,
Thus improve the certainty of measurement of iron core displacement.Its concrete scheme is as follows:
A kind of non-phase sensitivity digital demodulation system being applied to LVDT displacement transducer, described LVDT displacement passes
Sensor includes primary coil, iron core and secondary coil；Wherein, the excitation letter that described primary coil receives
Number for DDS sinusoidal excitation signal generator produce original excitation signal carry out digital-to-analogue conversion process successively
And the signal obtained after signal condition；Described system includes:
Pretreatment circuit, carries out signal condition and mould for the primary signal exporting described secondary coil
Number conversion processes, and obtains corresponding preprocessed signal；
Signal filter circuit, for filtering the noise signal in described preprocessed signal and/or high fdrequency component,
It is correspondingly made available the DC component comprising displacement information；
Message handler, for utilizing default mapping database, is carried out at mapping described DC component
Reason, obtains the iron core displacement information corresponding with described DC component.
Preferably, if the mode of connection of described LVDT displacement transducer is five-wire system or six line systems, then, institute
State pretreatment circuit to include:
First pretreatment circuit, for the of the first secondary coil output to described LVDT displacement transducer
One primary signal carries out signal condition and analog-to-digital conversion process, obtains corresponding first preprocessed signal；
Second pretreatment circuit, for the second subprime coil of described LVDT displacement transducer is exported the
Two primary signals carry out signal condition and analog-to-digital conversion process, obtain corresponding second preprocessed signal；
Wherein, described first pretreatment circuit includes that corresponding first signal conditioning circuit and the first modulus turn
Parallel operation；Described second pretreatment circuit includes corresponding secondary signal modulate circuit and the second analog-digital converter.
Preferably, described signal filter circuit includes:
First signal filter circuit, for filtering the noise signal in described first preprocessed signal and high frequency
Component, obtains comprising the first DC component of corresponding displacement information；
Secondary signal filter circuit, for filtering the noise signal in described second preprocessed signal and high frequency
Component, obtains comprising the second DC component of corresponding displacement information.
Preferably, described first signal filter circuit includes:
First symbolic number converting unit, for having symbol to the signal of described first analog-digital converter output
The conversion process of count, obtains corresponding first signed number；
First band filter, for carrying out bandpass filtering treatment to described first signed number；
First absolute value asks for unit, for carrying out the signal of described first band filter output definitely
Value ask for process；
First low pass filter, carries out low pass for described first absolute value is asked for the signal of unit output
Filtering Processing, obtains described first DC component；
Described secondary signal filter circuit includes:
Second symbolic number converting unit, for having symbol to the signal of described second analog-digital converter output
The conversion process of count, obtains corresponding second signed number；
Second band filter, for carrying out bandpass filtering treatment to described second signed number；
Second absolute value asks for unit, for carrying out the signal of described second band filter output definitely
Value ask for process；
Second low pass filter, carries out low pass for described second absolute value is asked for the signal of unit output
Filtering Processing, obtains described second DC component.
Preferably, described message handler includes:
Subtractor, for described first DC component and described second DC component are subtracted each other process,
Obtain DC component difference；
First finger, poor with described DC component for finding out from the first default mapping database
The iron core displacement information that value is corresponding；
Wherein, described first mapping database be pre-build for recording DC component and iron core displacement
The data base of mapping relations between information.
Preferably, if the mode of connection of described LVDT displacement transducer is three-wire system or four-wire system or direct current connects
Line mode, then, described pretreatment circuit includes:
3rd signal conditioning circuit, carries out signal for the single channel amplitude-modulated signal exporting described secondary coil
Conditioning；
3rd analog-digital converter, for carrying out mould to the conditioned signal of described 3rd signal conditioning circuit output
Number conversion processes, and obtains described preprocessed signal.
Preferably, if the mode of connection of described LVDT displacement transducer is three-wire system or four-wire system, then, institute
State signal filter circuit to include:
3rd symbolic number converting unit, for entering the preprocessed signal of described 3rd analog-digital converter output
The conversion process of row signed number, obtains corresponding 3rd signed number；
3rd band filter, for carrying out bandpass filtering treatment to described 3rd signed number；
3rd absolute value asks for unit, for carrying out the signal of described 3rd band filter output definitely
Value ask for process；
3rd low pass filter, carries out low pass for described 3rd absolute value is asked for the signal of unit output
Filtering Processing, obtains described DC component.
Preferably, if the mode of connection of described LVDT displacement transducer is three-wire system or four-wire system, described letter
Breath processor includes:
Second finger, for finding out and described DC component pair from the second default mapping database
The iron core displacement information answered；
Wherein, described second mapping database be pre-build for recording DC component and iron core displacement
The data base of mapping relations between information.
Preferably, if the mode of connection of described LVDT displacement transducer is the direct current mode of connection, then,
Described signal filter circuit includes:
4th low pass filter, for carrying out low to the preprocessed signal of described 3rd analog-digital converter output
Pass filter processes, and obtains described DC component；
Described message handler includes:
3rd finger, for finding out and described DC component pair from the 3rd default mapping database
The iron core displacement information answered；
Wherein, described 3rd mapping database be pre-build for recording DC component and iron core displacement
The data base of mapping relations between information.
The embodiment of the invention also discloses a kind of non-phase sensitivity digital demodulation being applied to LVDT displacement transducer
Method, described LVDT displacement transducer includes primary coil, iron core and secondary coil；Wherein, at the beginning of described
The pumping signal that level coil receives is the original excitation signal producing DDS sinusoidal excitation signal generator
The signal obtained after carrying out digital-to-analogue conversion process and signal condition successively；Described method includes:
The primary signal exporting described secondary coil carries out signal condition and analog-to-digital conversion process, obtains
Corresponding preprocessed signal；
Filter the noise signal in described preprocessed signal and/or high fdrequency component, be correspondingly made available and comprise displacement
The DC component of information；
Utilize preset mapping database, described DC component is carried out mapping process, obtain with described directly
The iron core displacement information that flow component is corresponding.
In the present invention, the non-phase sensitivity digital demodulation system being applied to LVDT displacement transducer includes: pretreatment
Circuit, for the primary signal of secondary coil output is carried out signal condition and analog-to-digital conversion process,
To corresponding preprocessed signal；Signal filter circuit, for filter noise signal in preprocessed signal and/
Or high fdrequency component, it is correspondingly made available the DC component comprising displacement information；Message handler, is used for utilizing
The mapping database preset, carries out mapping process to DC component, obtains the ferrum corresponding with DC component
Core displacement information.Visible, in the present invention, original letter secondary coil exported first with pretreatment circuit
Number carry out signal condition and analog-to-digital conversion process, obtain corresponding preprocessed signal, then utilize signal to filter
Wave circuit, filters the noise signal in preprocessed signal and/or high fdrequency component, thus is comprised
The DC component of displacement information, finally, message handler is by utilizing mapping database, to DC component
Carry out mapping process, obtain corresponding iron core displacement information, in summary, non-phase sensitivity disclosed by the invention
Digital demodulation system is during carrying out signal demodulation process, with phase place all without any association, that is,
This invention removes the phase jitter impact on the measuring accuracy of iron core displacement, improve iron core displacement
The certainty of measurement of amount.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to reality
Execute the required accompanying drawing used in example or description of the prior art to be briefly described, it should be apparent that below,
Accompanying drawing in description is only embodiments of the invention, for those of ordinary skill in the art, not
On the premise of paying creative work, it is also possible to obtain other accompanying drawing according to the accompanying drawing provided.
Fig. 1 is a kind of non-phase sensitivity digital solution being applied to LVDT displacement transducer disclosed in the embodiment of the present invention
Adjusting system application structure schematic diagram；
Fig. 2 is a kind of concrete non-phase sensitivity being applied to LVDT displacement transducer disclosed in the embodiment of the present invention
Digital demodulation system application structure schematic diagram；
Fig. 3 is the another kind of concrete non-phase being applied to LVDT displacement transducer disclosed in the embodiment of the present invention
Quick digital demodulation system application structure schematic diagram；
Fig. 4 is the embodiment of the present invention another concrete non-phase being applied to LVDT displacement transducer disclosed
Quick digital demodulation system application structure schematic diagram；
Fig. 5 is a kind of non-phase sensitivity digital solution being applied to LVDT displacement transducer disclosed in the embodiment of the present invention
Adjust method flow diagram.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the present invention, and
It is not all, of embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art are not doing
Go out the every other embodiment obtained under creative work premise, broadly fall into the scope of protection of the invention.
The embodiment of the invention discloses a kind of non-phase sensitivity digital demodulation system being applied to LVDT displacement transducer
System, LVDT displacement transducer includes primary coil, iron core and secondary coil；Wherein, primary coil receives
The pumping signal arrived is for DDS sinusoidal excitation signal generator (DDS, i.e. Direct Digital
Synthesizer, Direct Digital Synthesizer) original excitation signal that produces carries out digital-to-analogue conversion successively
The signal processed and obtain after signal condition；Shown in Figure 1, above-mentioned non-phase sensitivity digital demodulation system bag
Include:
Pretreatment circuit 11, for carrying out signal condition and modulus to the primary signal of secondary coil output
Conversion process, obtains corresponding preprocessed signal；
Signal filter circuit 12, for filtering the noise signal in preprocessed signal and/or high fdrequency component, phase
Should obtain comprising the DC component of displacement information in ground；
Message handler 13, for utilizing default mapping database, carries out mapping process to DC component,
Obtain the iron core displacement information corresponding with DC component.
It should be noted that above-mentioned signal filter circuit 12 and message handler 13 all can at FPGA (i.e.
Field Programmable Gate Array, field programmable gate array) in develop generation.
In the embodiment of the present invention, the non-phase sensitivity digital demodulation system being applied to LVDT displacement transducer includes:
Pretreatment circuit, for carrying out at signal condition and analog digital conversion the primary signal of secondary coil output
Reason, obtains corresponding preprocessed signal；Signal filter circuit, for filtering the noise in preprocessed signal
Signal and/or high fdrequency component, be correspondingly made available the DC component comprising displacement information；Message handler, uses
In utilizing the mapping database preset, DC component is carried out mapping process, obtains relative with DC component
The iron core displacement information answered.
Visible, in the embodiment of the present invention, primary signal secondary coil exported first with pretreatment circuit
Carry out signal condition and analog-to-digital conversion process, obtain corresponding preprocessed signal, then utilize signal filtering
Circuit, filters the noise signal in preprocessed signal and/or high fdrequency component, thus obtains comprising position
The DC component of shifting information, finally, DC component, by utilizing mapping database, is entered by message handler
Row mapping processes, and obtains corresponding iron core displacement information, in summary, non-disclosed in the embodiment of the present invention
Phase sensitivity digital demodulation system is during carrying out signal demodulation process, with phase place all without any association, also
That is, the embodiment of the present invention eliminates the phase jitter impact on the measuring accuracy of iron core displacement, improves
The certainty of measurement of iron core displacement.
The embodiment of the invention discloses a kind of concrete non-phase sensitivity numeral being applied to LVDT displacement transducer
Demodulating system, relative to a upper embodiment, the present embodiment is to be in the mode of connection of LVDT displacement transducer
In the case of five-wire system or six line systems, technical scheme is made further instruction and optimization.Concrete:
Shown in Figure 2, if the mode of connection of LVDT displacement transducer is five-wire system or six line systems, then,
Pretreatment circuit specifically can include the first pretreatment circuit 111 and the second pretreatment circuit 112；Wherein,
First pretreatment circuit 111, for the of the first secondary coil output to LVDT displacement transducer
One primary signal carries out signal condition and analog-to-digital conversion process, obtains corresponding first preprocessed signal；
Second pretreatment circuit 112, for the second subprime coil of LVDT displacement transducer is exported the
Two primary signals carry out signal condition and analog-to-digital conversion process, obtain corresponding second preprocessed signal；
Wherein, the first pretreatment circuit 111 includes corresponding first signal conditioning circuit 1111 and the first modulus
Transducer 1112；Second pretreatment circuit 112 includes corresponding secondary signal modulate circuit 1121 and the second mould
Number converter 1122.
Accordingly, signal filter circuit specifically includes the first signal filter circuit 121 and secondary signal filtered electrical
Road 122；Wherein,
First signal filter circuit 121, for filtering the noise signal in the first preprocessed signal and high frequency division
Amount, obtains comprising the first DC component of corresponding displacement information；
Secondary signal filter circuit 122, for filtering the noise signal in the second preprocessed signal and high frequency division
Amount, obtains comprising the second DC component of corresponding displacement information.
Concrete, the first signal filter circuit 121 specifically includes the first symbolic number converting unit 1211, first
Band filter the 1212, first absolute value asks for unit 1213 and the first low pass filter 1214；Wherein,
First symbolic number converting unit 1211, for carrying out the signal of the first analog-digital converter 1112 output
The conversion process of signed number, obtains corresponding first signed number；
First band filter 1212, for carrying out bandpass filtering treatment to the first signed number；
First absolute value asks for unit 1213, for carrying out the signal of the first band filter 1212 output
Absolute value ask for process；
First low pass filter 1214, is carried out for the first absolute value is asked for the signal of unit 1213 output
Low-pass filtering treatment, obtains the first DC component.
Wherein, the effect of the first band filter 1212 is that docking the signal received carries out noise signal
Filtering, the effect of the first low pass filter 1214 is that docking the signal received carries out filtering of high fdrequency component.
It addition, above-mentioned secondary signal filter circuit 122 includes that the second symbolic number converting unit 1221, second carries
Bandpass filter the 1222, second absolute value asks for unit 1223 and the second low pass filter 1224；Wherein,
Second symbolic number converting unit 1221, for carrying out the signal of the second analog-digital converter 1122 output
The conversion process of signed number, obtains corresponding second signed number；
Second band filter 1222, for carrying out bandpass filtering treatment to the second signed number；
Second absolute value asks for unit 1223, for carrying out the signal of the second band filter 1222 output
Absolute value ask for process；
Second low pass filter 1224, is carried out for the second absolute value is asked for the signal of unit 1223 output
Low-pass filtering treatment, obtains the second DC component.
Wherein, the effect of the second band filter 1222 is that docking the signal received carries out noise signal
Filtering, the effect of the second low pass filter 1224 is that docking the signal received carries out filtering of high fdrequency component.
Further, message handler specifically includes subtractor 131 and the first finger 132；Wherein
Subtractor 131, for the first DC component and the second DC component are subtracted each other process, obtains straight
Flow component difference；
First finger 132, for finding out and DC component difference from the first default mapping database
Corresponding iron core displacement information；
Wherein, the first mapping database be pre-build for recording DC component and iron core displacement information
Between the data base of mapping relations.
The embodiment of the invention discloses the another kind of concrete non-phase sensitivity number being applied to LVDT displacement transducer
Word demodulating system, relative to a upper embodiment, the present embodiment is the mode of connection at LVDT displacement transducer
In the case of three-wire system or four-wire system or the direct current mode of connection, technical scheme is made further instruction
And optimization.Concrete:
See shown in Fig. 3 or Fig. 4, if the mode of connection of LVDT displacement transducer be three-wire system or four-wire system or
The direct current mode of connection, then, pretreatment circuit 113 includes that the 3rd signal conditioning circuit 1131 and the 3rd modulus turn
Parallel operation 1132；Wherein,
3rd signal conditioning circuit 1131, for carrying out signal to the single channel amplitude-modulated signal of secondary coil output
Conditioning；
3rd analog-digital converter 1132, for entering the conditioned signal of the 3rd signal conditioning circuit 1131 output
Row analog-to-digital conversion process, obtains preprocessed signal.
When the mode of connection of LVDT displacement transducer is three-wire system or four-wire system, shown in Figure 3, this
Time secondary coil on modulated signal be single channel amplitude-modulated signal, so only need to provide a road filter circuit just can,
That is, signal filter circuit 123 now includes the 3rd symbolic number converting unit the 1231, the 3rd bandpass filtering
Device the 1232, the 3rd absolute value asks for unit 1233 and the 3rd low pass filter 1234, and message handler includes
Second finger 133；Wherein,
3rd symbolic number converting unit 1231, for the pretreatment letter to the 3rd analog-digital converter 1132 output
Number carry out the conversion process of signed number, obtain corresponding 3rd signed number；
3rd band filter 1232, for carrying out bandpass filtering treatment to the 3rd signed number；
3rd absolute value asks for unit 1233, for carrying out the signal of the 3rd band filter 1232 output
Absolute value ask for process；
3rd low pass filter 1234, is carried out for the 3rd absolute value is asked for the signal of unit 1233 output
Low-pass filtering treatment, obtains DC component.
Second finger 133 is corresponding with DC component for finding out from the second default mapping database
Iron core displacement information；
Wherein, the second mapping database be pre-build for recording DC component and iron core displacement information
Between the data base of mapping relations.It is further to note that the acting on of the 3rd band filter 1232
In the signal received is carried out filtering of noise signal, it is right that the effect of the 3rd low pass filter 1234 is
The signal received carries out filtering of high fdrequency component.
Shown in Figure 4, when the mode of connection of LVDT displacement transducer is the direct current mode of connection, directly
The signal of analog-digital converter output is carried out low-pass filtering just can, that is, signal filter circuit bag now
Including the 4th low pass filter 124, message handler includes the 3rd finger 134.Wherein,
4th low pass filter 124, for carrying out the preprocessed signal of the 3rd analog-digital converter 1132 output
Low-pass filtering treatment, obtains DC component.
3rd finger 134 is corresponding with DC component for finding out from the 3rd default mapping database
Iron core displacement information；
Wherein, the 3rd mapping database be pre-build for recording DC component and iron core displacement information
Between the data base of mapping relations.It is further to note that the effect of the 4th low pass filter 124 is
The signal received is carried out filtering of high fdrequency component.
The embodiment of the invention also discloses a kind of non-phase sensitivity digital demodulation being applied to LVDT displacement transducer
Method, LVDT displacement transducer includes primary coil, iron core and secondary coil；Wherein, primary coil connects
The pumping signal received is that the original excitation signal producing DDS sinusoidal excitation signal generator is carried out successively
The signal obtained after digital-to-analogue conversion process and signal condition；Shown in Figure 5, said method includes:
Step S51: the primary signal of secondary coil output is carried out signal condition and analog-to-digital conversion process,
Obtain corresponding preprocessed signal；
Step S52: filter the noise signal in preprocessed signal and/or high fdrequency component, be correspondingly made available and comprise
The DC component of displacement information；
Step S53: utilize preset mapping database, DC component is carried out mapping process, obtain with directly
The iron core displacement information that flow component is corresponding.
About the process that each step above-mentioned is more specific refer to disclosed in previous embodiment corresponding in
Holding, this is no longer going to repeat them.
Visible, in the embodiment of the present invention, first to secondary coil output primary signal carry out signal condition and
Analog-to-digital conversion process, obtains corresponding preprocessed signal, then by the noise signal in preprocessed signal and/
Or high fdrequency component filters, thus obtain comprising the DC component of displacement information, finally, by utilizing
Mapping database, carries out mapping process to DC component, obtains corresponding iron core displacement information, to sum up may be used
Knowing, the embodiment of the present invention is during carrying out signal demodulation process, with phase place all without any association, also
That is, the embodiment of the present invention eliminates the phase jitter impact on the measuring accuracy of iron core displacement, improves
The certainty of measurement of iron core displacement.
Finally, in addition it is also necessary to explanation, in this article, the relational terms of such as first and second or the like
It is used merely to separate an entity or operation with another entity or operating space, and not necessarily requires
Or imply relation or the order that there is any this reality between these entities or operation.And, art
Language " includes ", " comprising " or its any other variant are intended to comprising of nonexcludability, thus
Make to include that the process of a series of key element, method, article or equipment not only include those key elements, and
Also include other key elements being not expressly set out, or also include for this process, method, article or
The key element that person's equipment is intrinsic.In the case of there is no more restriction, by statement " including ... "
The key element limited, it is not excluded that also deposit in including the process of described key element, method, article or equipment
In other identical element.
Above to a kind of non-phase sensitivity digital demodulation being applied to LVDT displacement transducer provided by the present invention
System and method is described in detail, and specific case used herein is to the principle of the present invention and enforcement
Mode is set forth, and the explanation of above example is only intended to help to understand method and the core thereof of the present invention
Thought is thought；Simultaneously for one of ordinary skill in the art, according to the thought of the present invention, concrete real
Executing and all will change in mode and range of application, in sum, this specification content should not be construed as
Limitation of the present invention.
Claims (10)
1. the non-phase sensitivity digital demodulation system being applied to LVDT displacement transducer, it is characterised in that
Described LVDT displacement transducer includes primary coil, iron core and secondary coil；Wherein, described primary line
The pumping signal that receives of circle be the original excitation signal that DDS sinusoidal excitation signal generator is produced successively
The signal obtained after carrying out digital-to-analogue conversion process and signal condition；Described system includes:
Pretreatment circuit, carries out signal condition and mould for the primary signal exporting described secondary coil
Number conversion processes, and obtains corresponding preprocessed signal；
Signal filter circuit, for filtering the noise signal in described preprocessed signal and/or high fdrequency component,
It is correspondingly made available the DC component comprising displacement information；
Message handler, for utilizing default mapping database, is carried out at mapping described DC component
Reason, obtains the iron core displacement information corresponding with described DC component.
The non-phase sensitivity digital demodulation system being applied to LVDT displacement transducer the most according to claim 1
System, it is characterised in that if the mode of connection of described LVDT displacement transducer is five-wire system or six line systems,
Then, described pretreatment circuit includes:
First pretreatment circuit, for the first secondary coil output to described LVDT displacement transducer
First primary signal carries out signal condition and analog-to-digital conversion process, obtains corresponding first preprocessed signal；
Second pretreatment circuit, for export the second subprime coil of described LVDT displacement transducer
Second primary signal carries out signal condition and analog-to-digital conversion process, obtains corresponding second preprocessed signal；
Wherein, described first pretreatment circuit includes that corresponding first signal conditioning circuit and the first modulus turn
Parallel operation；Described second pretreatment circuit includes corresponding secondary signal modulate circuit and the second analog-digital converter.
The non-phase sensitivity digital demodulation system being applied to LVDT displacement transducer the most according to claim 2
System, it is characterised in that described signal filter circuit includes:
First signal filter circuit, for filtering the noise signal in described first preprocessed signal and high frequency
Component, obtains comprising the first DC component of corresponding displacement information；
Secondary signal filter circuit, for filtering the noise signal in described second preprocessed signal and high frequency
Component, obtains comprising the second DC component of corresponding displacement information.
The non-phase sensitivity digital demodulation system being applied to LVDT displacement transducer the most according to claim 3
System, it is characterised in that
Described first signal filter circuit includes:
First symbolic number converting unit, for having symbol to the signal of described first analog-digital converter output
The conversion process of count, obtains corresponding first signed number；
First band filter, for carrying out bandpass filtering treatment to described first signed number；
First absolute value asks for unit, for carrying out the signal of described first band filter output definitely
Value ask for process；
First low pass filter, carries out low pass for described first absolute value is asked for the signal of unit output
Filtering Processing, obtains described first DC component；
Described secondary signal filter circuit includes:
Second symbolic number converting unit, for having symbol to the signal of described second analog-digital converter output
The conversion process of count, obtains corresponding second signed number；
Second band filter, for carrying out bandpass filtering treatment to described second signed number；
Second absolute value asks for unit, for carrying out the signal of described second band filter output definitely
Value ask for process；
Second low pass filter, carries out low pass for described second absolute value is asked for the signal of unit output
Filtering Processing, obtains described second DC component.
The non-phase sensitivity digital demodulation system being applied to LVDT displacement transducer the most according to claim 4
System, it is characterised in that described message handler includes:
Subtractor, for described first DC component and described second DC component are subtracted each other process,
Obtain DC component difference；
First finger, poor with described DC component for finding out from the first default mapping database
The iron core displacement information that value is corresponding；
Wherein, described first mapping database be pre-build for recording DC component and iron core displacement
The data base of mapping relations between information.
The non-phase sensitivity digital demodulation system being applied to LVDT displacement transducer the most according to claim 1
System, it is characterised in that if the mode of connection of described LVDT displacement transducer be three-wire system or four-wire system or
The direct current mode of connection, then, described pretreatment circuit includes:
3rd signal conditioning circuit, carries out signal for the single channel amplitude-modulated signal exporting described secondary coil
Conditioning；
3rd analog-digital converter, for carrying out mould to the conditioned signal of described 3rd signal conditioning circuit output
Number conversion processes, and obtains described preprocessed signal.
The non-phase sensitivity digital demodulation system being applied to LVDT displacement transducer the most according to claim 6
System, it is characterised in that if the mode of connection of described LVDT displacement transducer is three-wire system or four-wire system,
Then, described signal filter circuit includes:
3rd symbolic number converting unit, for entering the preprocessed signal of described 3rd analog-digital converter output
The conversion process of row signed number, obtains corresponding 3rd signed number；
3rd band filter, for carrying out bandpass filtering treatment to described 3rd signed number；
3rd absolute value asks for unit, for carrying out the signal of described 3rd band filter output definitely
Value ask for process；
3rd low pass filter, carries out low pass for described 3rd absolute value is asked for the signal of unit output
Filtering Processing, obtains described DC component.
The non-phase sensitivity digital demodulation system being applied to LVDT displacement transducer the most according to claim 7
System, it is characterised in that if the mode of connection of described LVDT displacement transducer is three-wire system or four-wire system,
Described message handler includes:
Second finger, for finding out and described DC component pair from the second default mapping database
The iron core displacement information answered；
Wherein, described second mapping database be pre-build for recording DC component and iron core displacement
The data base of mapping relations between information.
The non-phase sensitivity digital demodulation system being applied to LVDT displacement transducer the most according to claim 6
System, it is characterised in that if the mode of connection of described LVDT displacement transducer is the direct current mode of connection, then,
Described signal filter circuit includes:
4th low pass filter, for carrying out low to the preprocessed signal of described 3rd analog-digital converter output
Pass filter processes, and obtains described DC component；
Described message handler includes:
3rd finger, for finding out and described DC component pair from the 3rd default mapping database
The iron core displacement information answered；
Wherein, described 3rd mapping database be pre-build for recording DC component and iron core displacement
The data base of mapping relations between information.
10. the non-phase sensitivity digital demodulation method being applied to LVDT displacement transducer, it is characterised in that
Described LVDT displacement transducer includes primary coil, iron core and secondary coil；Wherein, described primary line
The pumping signal that receives of circle be the original excitation signal that DDS sinusoidal excitation signal generator is produced successively
The signal obtained after carrying out digital-to-analogue conversion process and signal condition；Described method includes:
The primary signal exporting described secondary coil carries out signal condition and analog-to-digital conversion process, obtains
Corresponding preprocessed signal；
Filter the noise signal in described preprocessed signal and/or high fdrequency component, be correspondingly made available and comprise displacement
The DC component of information；
Utilize preset mapping database, described DC component is carried out mapping process, obtain with described directly
The iron core displacement information that flow component is corresponding.
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