CN105004257A - Eddy current displacement sensor with display function - Google Patents
Eddy current displacement sensor with display function Download PDFInfo
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- CN105004257A CN105004257A CN201510262738.XA CN201510262738A CN105004257A CN 105004257 A CN105004257 A CN 105004257A CN 201510262738 A CN201510262738 A CN 201510262738A CN 105004257 A CN105004257 A CN 105004257A
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Abstract
The present invention discloses an eddy current displacement sensor with a display function. The eddy current displacement sensor with the display function comprises an eddy current displacement sensor probe and a prepositive device, the prepositive device comprises a high-frequency oscillating circuit, a conversion and detection circuit, an output conversion circuit, a display switch, an offset processing and display driving circuit and a digital display unit, and the digital display unit can display the voltage offset quantity in the output of the prepositive device of the sensor to determine the installation position of the sensor. The eddy current displacement sensor with the display function of the present invention can detect the installation position of the sensor probe conveniently when the sensor is installed, debugged and works, thereby guaranteeing that the sensor probe is always at the ideal installation position, preventing the problem that the measurement result is not accurate due to the change of the installation position of the sensor probe, and improving the measurement precision and the reliability.
Description
Technical field
The invention belongs to eddy current displacement measurement technology field, be specifically related to a kind of eddy current displacement sensor with Presentation Function.
Background technology
Noncontact, measurement range are large, highly sensitive owing to having for eddy current displacement sensor, structure simply, not the many merits such as to affect by nonmetallic materials, are widely used at detection field.Eddy current displacement sensor is generally made up of probe, concentric cable and fore-lying device, also can the structure forming integration in this three housing being partially integrated in probe.
The principle of work of eddy current displacement sensor is when the pancake coil of sensor probe front end is under the incentive action of high-frequency oscillating circuits, a high frequency magnetic field is produced around pancake coil, the measured conductor inside be positioned near pancake coil will form current vortex, and the alternating magnetic field that the current vortex in measured conductor produces makes the parameters such as the equiva lent impedance in cell winding, inductance and quality factor change.If only have that the distance between pancake coil and measured conductor changes and other parameters remain unchanged, equiva lent impedance so in pancake coil, inductance and quality factor just become the single-valued function of the spacing of pancake coil and measured conductor, and have linear relationship in certain scope.So just the distance between high temperature pancake coil and measured conductor can be changed the change being converted into voltage with conversion and testing circuit, eventually pass output conversion circuit and be converted into required voltage range.
In order to make eddy current displacement sensor, there is maximum measurement range, at the mid point that the best position of sensor is linear sensor measurement range, if the installation site of sensor deviate from the best position of sensor, so the measurement range of sensor will reduce, if the displacement of measured conductor is comparatively large, the measurement result of sensor will be inaccurate.So all need to guarantee that sensor is at best position under the installation and duty of sensor.Be all the output utilizing multimeter or other testing tools to measure fore-lying device at present in eddy current displacement sensor installation process, installment work is cumbersome; In addition under the duty of sensor, the also more difficult installment state determining sensor.
Summary of the invention
For the above-mentioned technical matters existing for prior art, the invention provides and be specifically related to a kind of eddy current displacement sensor with Presentation Function, so as sensor install and in working order under confirmation to sensor mounting location.
With an eddy current displacement sensor for Presentation Function, comprising: electric vortex displacement sensor probe and fore-lying device; Wherein:
Described electric vortex displacement sensor probe is connected with fore-lying device, it for producing high frequency magnetic field under the high frequency pumping effect of fore-lying device, by the alternating magnetic field that produces of current vortex in induction measured conductor to the effect of therein coil, with to fore-lying device output packet containing the equiva lent impedance signal of measured conductor displacement information, inductance signal or quality factor signal;
Described fore-lying device is used for described equiva lent impedance signal, inductance signal or quality factor signal to be converted to the voltage signal comprising displacement information, thus export after voltage transitions is carried out to this signal, and then from output signal, isolate direct current biasing amount and the size of direct current biasing amount is shown.
Further, described electric vortex displacement sensor probe is connected with fore-lying device by concentric cable.
Further, described electric vortex displacement sensor probe comprises pancake coil, sensor framework, fixed cover and protective sleeve; Wherein, described sensor framework is installed in the endoporus of fixed cover; described pancake coil is wound in one end that sensor framework exposes fixed cover; the part that sensor framework exposes fixed cover is wrapped up by protective sleeve, all adopts glue bond to fix between pancake coil and protective sleeve and between sensor framework and fixed cover.
Further, described sensor framework is shaft-like and axially has fairlead, and described concentric cable is drawn from described fairlead and is connected with fore-lying device.
Described fore-lying device comprises high-frequency oscillating circuits, conversion and testing circuit, output conversion circuit, bias treatment and display driver circuit and digital display unit; Wherein:
Described high-frequency oscillating circuits is connected with electric vortex displacement sensor probe, and it is for applying exciting current for electric vortex displacement sensor probe;
Described conversion and testing circuit are connected with electric vortex displacement sensor probe, and it is converted to for equiva lent impedance signal, inductance signal or the quality factor signal exported by electric vortex displacement sensor probe the voltage signal comprising displacement information;
Described output conversion circuit is connected with conversion and testing circuit, and it exports after carrying out voltage transitions to described voltage signal;
Described bias treatment and display driver circuit are connected with output conversion circuit, and it for isolating direct current biasing amount from the output signal of output conversion circuit;
Described digital display unit is connected with bias treatment and display driver circuit, and it is for showing the size of described direct current biasing amount.
Further, described bias treatment and display driver circuit are connected with output conversion circuit by display switch.
In eddy current displacement sensor of the present invention, the output signal of fore-lying device comprises a direct current biasing amount and a dynamic amount, direct current biasing amount is generally the voltage corresponding to the primary clearance between cell winding and measured conductor, and dynamically measures as the voltage between cell winding and measured conductor during gap corresponding to change.Therefore, in eddy current displacement sensor, in fore-lying device output signal, the size of direct current biasing amount just illustrates the installation site of sensor.
The present invention has set up a numeric display unit in the fore-lying device of eddy current displacement sensor, direct current biasing amount in eddy current displacement sensor output signal is shown, thus in the installation process of sensor, be convenient to the determination of sensor best position; Under the duty of sensor, the installment state of sensor can be determined easily.
Accompanying drawing explanation
Fig. 1 is the structural representation of eddy current displacement sensor of the present invention.
Fig. 2 is the structural representation of electric vortex displacement sensor probe of the present invention.
Fig. 3 is the structural representation of fore-lying device in eddy current displacement sensor of the present invention.
Embodiment
In order to more specifically describe the present invention, below in conjunction with the drawings and the specific embodiments, technical scheme of the present invention is described in detail.
As shown in Figure 1, the present invention, with the eddy current displacement sensor of Presentation Function, comprises current vortex sensor probe 1 and the fore-lying device 2 with Presentation Function.Current vortex sensor probe 1 is connected with concentric cable 3 with between the fore-lying device 2 with Presentation Function.
As shown in Figure 2, electric vortex displacement sensor probe 1 in present embodiment, is made up of pancake coil 11, nonmetal sensor framework 12, probe protective sleeve 13, sensor fixed cover 14, concentric cable 15 and displacement transducer joint 15; Pancake coil 11 is positioned at the front end of nonmetal sensor framework 12; and protect with probe protective sleeve 13; fix with glue between pancake coil 11 and probe protective sleeve 13; in nonmetal sensor framework 12 screwed sensor fixed cover 14 endoporus mounted externally; blend compounds is fixed; nonmetal sensor framework 12 has fairlead, so that concentric cable 15 links together pancake coil 11 and external sensor joint 16.
As shown in Figure 3, fore-lying device 2 in present embodiment, is made up of high-frequency oscillating circuits, conversion and testing circuit, output conversion circuit, display switch, bias treatment and display driver circuit and digital display unit.Wherein: high-frequency oscillating circuits is connected with electric vortex displacement sensor probe 1, and it applies exciting current for electric vortex displacement sensor probe 1; Conversion and testing circuit are connected with electric vortex displacement sensor probe 1, and its equiva lent impedance signal, inductance signal or quality factor signal exported by electric vortex displacement sensor probe 1 is converted to the voltage signal comprising displacement information; Output conversion circuit is connected with conversion and testing circuit, and it exports after carrying out voltage transitions to voltage signal; Bias treatment and display driver circuit are connected with output conversion circuit by display switch, and it isolates direct current biasing amount from the output signal of output conversion circuit; Digital display unit is connected with bias treatment and display driver circuit, and it shows the size of direct current biasing amount.
Present embodiment utilizes conversion and testing circuit to convert equiva lent impedance, inductance or the quality factor in sensor probe inner flat coil 11, and after filtering, the conversion such as amplification, be converted into corresponding voltage, input to output conversion circuit again, be met the voltage exporting and require, direct current biasing amount in utilizing bias treatment and display driver circuit to be outputed signal by output conversion circuit is extracted, finally input to digital display unit to show, by display switch, display unit is switched.
Above-mentioned is can understand and apply the invention for ease of those skilled in the art to the description of embodiment.Person skilled in the art obviously easily can make various amendment to above-described embodiment, and General Principle described herein is applied in other embodiments and need not through performing creative labour.Therefore, the invention is not restricted to above-described embodiment, those skilled in the art are according to announcement of the present invention, and the improvement made for the present invention and amendment all should within protection scope of the present invention.
Claims (7)
1. the eddy current displacement sensor with Presentation Function, comprising: electric vortex displacement sensor probe and fore-lying device; It is characterized in that:
Described electric vortex displacement sensor probe is connected with fore-lying device, it for producing high frequency magnetic field under the high frequency pumping effect of fore-lying device, by the alternating magnetic field that produces of current vortex in induction measured conductor to the effect of therein coil, with to fore-lying device output packet containing the equiva lent impedance signal of measured conductor displacement information, inductance signal or quality factor signal;
Described fore-lying device is used for described equiva lent impedance signal, inductance signal or quality factor signal to be converted to the voltage signal comprising displacement information, thus export after voltage transitions is carried out to this signal, and then from output signal, isolate direct current biasing amount and the size of direct current biasing amount is shown.
2. eddy current displacement sensor according to claim 1, is characterized in that: described electric vortex displacement sensor probe is connected with fore-lying device by concentric cable.
3. eddy current displacement sensor according to claim 1, is characterized in that: described electric vortex displacement sensor probe comprises pancake coil, sensor framework, fixed cover and protective sleeve; Wherein, described sensor framework is installed in the endoporus of fixed cover; described pancake coil is wound in one end that sensor framework exposes fixed cover; the part that sensor framework exposes fixed cover is wrapped up by protective sleeve, all adopts glue bond to fix between pancake coil and protective sleeve and between sensor framework and fixed cover.
4. eddy current displacement sensor according to claim 3, is characterized in that: described sensor framework is shaft-like and axially has fairlead, and described concentric cable is drawn from described fairlead and is connected with fore-lying device.
5. eddy current displacement sensor according to claim 1, is characterized in that: described fore-lying device comprises high-frequency oscillating circuits, conversion and testing circuit, output conversion circuit, bias treatment and display driver circuit and digital display unit; Wherein:
Described high-frequency oscillating circuits is connected with electric vortex displacement sensor probe, and it is for applying exciting current for electric vortex displacement sensor probe;
Described conversion and testing circuit are connected with electric vortex displacement sensor probe, and it is converted to for equiva lent impedance signal, inductance signal or the quality factor signal exported by electric vortex displacement sensor probe the voltage signal comprising displacement information;
Described output conversion circuit is connected with conversion and testing circuit, and it exports after carrying out voltage transitions to described voltage signal;
Described bias treatment and display driver circuit are connected with output conversion circuit, and it for isolating direct current biasing amount from the output signal of output conversion circuit;
Described digital display unit is connected with bias treatment and display driver circuit, and it is for showing the size of described direct current biasing amount.
6. eddy current displacement sensor according to claim 5, is characterized in that: described bias treatment and display driver circuit are connected with output conversion circuit by display switch.
7. eddy current displacement sensor according to claim 1, it is characterized in that: described electric vortex displacement sensor probe and the described fore-lying device with Presentation Function can be divided into two unit, also can the fore-lying device with Presentation Function be integrated on electric vortex displacement sensor probe, form the Integral electric vortex displacement transducer with Presentation Function.
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| CN201510262738.XA CN105004257A (en) | 2015-05-21 | 2015-05-21 | Eddy current displacement sensor with display function |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107101573A (en) * | 2017-05-03 | 2017-08-29 | 武汉轻工大学 | A kind of on-line measurement device, method and the application of ultra-thin glass thickness |
| CN109239911A (en) * | 2018-07-12 | 2019-01-18 | 中国科学院国家天文台南京天文光学技术研究所 | Adaptive subaperture based on electric eddy current measurement controls equipment |
| CN109612380A (en) * | 2019-01-28 | 2019-04-12 | 江阴信和电力仪表有限公司 | A kind of coil redundance type eddy current displacement sensor |
| CN113203350A (en) * | 2021-04-19 | 2021-08-03 | 浙江大学 | Eddy current displacement sensor linearization method based on inverse function piecewise correction and eddy current displacement sensor using same |
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| JPH032501A (en) * | 1989-05-29 | 1991-01-08 | Sumitomo Metal Ind Ltd | Size measuring method |
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| JPH032501A (en) * | 1989-05-29 | 1991-01-08 | Sumitomo Metal Ind Ltd | Size measuring method |
| CN1773211A (en) * | 2005-11-01 | 2006-05-17 | 上海瑞视仪表电子有限公司 | Ultra-low temperature drift electric vortex vibrating/displacement sensor |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107101573A (en) * | 2017-05-03 | 2017-08-29 | 武汉轻工大学 | A kind of on-line measurement device, method and the application of ultra-thin glass thickness |
| CN109239911A (en) * | 2018-07-12 | 2019-01-18 | 中国科学院国家天文台南京天文光学技术研究所 | Adaptive subaperture based on electric eddy current measurement controls equipment |
| CN109612380A (en) * | 2019-01-28 | 2019-04-12 | 江阴信和电力仪表有限公司 | A kind of coil redundance type eddy current displacement sensor |
| CN113203350A (en) * | 2021-04-19 | 2021-08-03 | 浙江大学 | Eddy current displacement sensor linearization method based on inverse function piecewise correction and eddy current displacement sensor using same |
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Application publication date: 20151028 |