CN205262392U - Axial displacement detection device and magnetic suspension bearing system of pivot - Google Patents
Axial displacement detection device and magnetic suspension bearing system of pivot Download PDFInfo
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- CN205262392U CN205262392U CN201521108100.2U CN201521108100U CN205262392U CN 205262392 U CN205262392 U CN 205262392U CN 201521108100 U CN201521108100 U CN 201521108100U CN 205262392 U CN205262392 U CN 205262392U
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Abstract
The utility model discloses an axial displacement detection device and magnetic suspension bearing system of pivot. Be provided with the step in the pivot of awaiting measuring, the device includes: radial probe, the setting is radial the pivot of awaiting measuring to set up relatively with the step, be used for responding to the effective detection area and the output of step and effectively detecting the corresponding signal of telecommunication of area, and the treater, be connected with radial probe for according to the await measuring axial displacement of pivot of signal of telecommunication sureness. Through the utility model discloses, solved and detected the problem that axial displacement detection method accuracy not high of the displacement of axial detection face as the pivot through the axial probe in the correlation technique.
Description
Technical field
The utility model relates to detection field, in particular to a kind of device for detecting axial displacement and magnetcisuspension of rotating shaftFloating bearing arrangement.
Background technology
The setting of the shaft position sensor in magnetic levitation bearing system not only will meet simple possible in structure, more will protectThe accuracy of card displacement detecting. The mode that most detects axial displacement is all to arrange in the axial direction one or manyIndividual probe, probe an axial detection faces is set above, rely on axial probe detect and axial detection facesDistance is determined the axial displacement of rotating shaft. Fig. 1 is radial displacement and the axial displacement detecting sensor in correlation techniqueStructure master looks schematic diagram, and as shown in Figure 1, it is upper that shaft position sensor 3 ' is arranged on sensor housing 1 ', for inspectionSurvey the distance between axial detection faces 5 ', axially detection faces 5 ' is perpendicular to the axis of rotating shaft 4 ' to be measured. Fig. 2 isThe structure schematic top plan view of the radial displacement in correlation technique and axial displacement detecting sensor, as shown in Figure 2, T5 'With T6 ' is two shaft position sensors, be arranged on the end face of sensor housing 1 '. This by detecting and axleThe detection method that is used as rotating shaft axial displacement to the displacement between detection faces can there are the following problems: (1) is when axial inspectionSurvey face is because mismachining tolerance and alignment error are while occurring tilting, even if there is not axial displacement in rotating shaft, axially detection faces withDistance between shaft position sensor also can, along with the rotary course of rotating shaft changes, cause shaft position sensorThe value of the axial displacement of output constantly changes in the rotary course of rotating shaft, according to the control logic of magnetic levitation bearing system,System can constantly regulate the axial location of rotating shaft, makes rotating shaft produce in the axial direction play, affects countershaft axialControl, serious meeting directly causes the unstability of system, and the reliability of system is had to very large impact; (2) axialThe mode that detection faces adopts a probe test or multiple probe to average, the suffered temperature of its axial probe is floated axiallyThe impact of displacement measurement cannot effectively be eliminated. This detection method need to be arranged an axial probe in the axial direction of rotating shaftDetection faces, therefore, axially detection faces processing, the flatness of installing, perpendicularity have the accuracy of axial displacement testVery large impact. And, the way of output of the axial arranged two probe summations of this employing, the temperature of having amplified axial probeDegree drift, the accuracy of axial displacement test is subject to the impact of temperature larger.
For detecting the displacement of axial detection faces as the axial displacement detection side of rotating shaft by axial probe in correlation techniqueThe problem that method accuracy is not high, not yet proposes effective solution at present.
Utility model content
Main purpose of the present utility model is to provide a kind of device for detecting axial displacement and magnetic suspension bearing system of rotating shaftSystem, detects the displacement of axial detection faces as the axial displacement detection of rotating shaft to solve in correlation technique by axial probeThe problem that method accuracy is not high.
To achieve these goals, according to an aspect of the present utility model, provide a kind of axial displacement inspection of rotating shaftSurvey device. In rotating shaft to be measured, be provided with step, this device comprises: radially probe, be arranged on rotating shaft to be measured radially,And be oppositely arranged with step, for responding to effective area of detection the output and effective corresponding telecommunications of area of detection of stepNumber; And processor, with radially probe be connected, for determine the axial displacement of rotating shaft to be measured according to the signal of telecommunication.
Further, radially probe comprises: first radially pops one's head in, for responding to effective area of detection the output of stepFirst signal of telecommunication; And second radially probe, for responding to effective area of detection of step and exporting second signal of telecommunication,Wherein, the first radially probe and second interval predeterminable range on the axis direction of rotating shaft to be measured of radially popping one's head in.
Further, first radially probe and second radially pop one's head in the straight line at place and the axis of rotating shaft to be measured parallel.
Further, radially probe comprises radially probe of many groups, radially pops one's head in for every group and comprises two radially probes, every groupRadially two interval predeterminable ranges on the axis direction of rotating shaft to be measured of radially popping one's head in of probe.
Further, every group of two of radially popping one's head in radially pop one's head in the straight line at place and the axis of rotating shaft to be measured parallel.
Further, radially pop one's head in along the even circumferential layout of step for many groups.
Further, radially probe is current vortex sensor.
Further, this device also comprises: sensor housing, be set in the outside of step, and pop one's head in for fixed radial.
To achieve these goals, according to an aspect of the present utility model, provide a kind of magnetic levitation bearing system.This system comprises: rotating shaft to be measured, is provided with step in rotating shaft to be measured; And device for detecting axial displacement, wherein, axleComprise to displacement detector: radially probe, be arranged on rotating shaft to be measured radially, and be oppositely arranged with step, forEffective area of detection of induction step output and effective corresponding signal of telecommunication of area of detection; And processor, and radiallyProbe is connected, for determine the axial displacement of rotating shaft to be measured according to the signal of telecommunication.
Further, this system also comprises: controller, be connected with processor, for according to rotating shaft to be measured axiallyThe position of adjustment of displacement rotating shaft to be measured.
The utility model by be arranged on rotating shaft to be measured radially and the radially probe induction step that is oppositely arranged with stepEffectively area of detection output and the effective corresponding signal of telecommunication of area of detection, and with processor that radially probe is connectedDetermine the axial displacement of rotating shaft to be measured according to the signal of telecommunication, solved in correlation technique and detected axially and detect by axial probeThe displacement of face is as the not high problem of axial displacement detection method accuracy of rotating shaft. Probe by radial arrangement detectsEffective area of detection of the step in rotating shaft, has reached the axial displacement detection method accuracy effect that improves rotating shaft.
Brief description of the drawings
The accompanying drawing that forms the application's a part is used to provide further understanding of the present utility model, of the present utility modelSchematic description and description is used for explaining the utility model, does not form improper restriction of the present utility model. ?In accompanying drawing:
Fig. 1 is that radial displacement in correlation technique and the structure master of axial displacement detecting sensor look schematic diagram;
Fig. 2 is radial displacement in correlation technique and the structure schematic top plan view of axial displacement detecting sensor;
Fig. 3 is according to the schematic diagram of the magnetic levitation bearing system of the utility model embodiment;
Fig. 4 is according to the schematic diagram of the device for detecting axial displacement of the rotating shaft of the utility model the first embodiment;
Fig. 5 is according to the schematic diagram of the device for detecting axial displacement of the rotating shaft of the utility model the second embodiment; And
Fig. 6 is according to the schematic diagram of the device for detecting axial displacement of the rotating shaft of the utility model the 3rd embodiment.
Detailed description of the invention
It should be noted that, in the situation that not conflicting, the feature in embodiment and embodiment in the application can phaseCombination mutually. Describe below with reference to the accompanying drawings and in conjunction with the embodiments the utility model in detail.
In order to make those skilled in the art person understand better the application's scheme, below in conjunction with in the embodiment of the present applicationAccompanying drawing, is clearly and completely described the technical scheme in the embodiment of the present application, obviously, and described embodimentOnly the embodiment of the application's part, instead of whole embodiment. Based on the embodiment in the application, abilityTerritory those of ordinary skill, not making the every other embodiment obtaining under creative work prerequisite, all should belong toThe scope of the application's protection.
It should be noted that the term " first ", " in the application's description and claims and above-mentioned accompanying drawingTwo " be etc. for distinguishing similar object, and needn't be used for describing specific order or precedence. Should be appreciated that thisThe data that sample uses are suitably exchanging in situation, so that the application's described herein embodiment. In addition term," comprise " and " having " and their any distortion, intention is to cover not exclusive comprising.
Embodiment of the present utility model provides a kind of magnetic levitation bearing system.
Fig. 3 is according to the schematic diagram of the magnetic levitation bearing system of the utility model embodiment. As shown in Figure 3, this systemComprise: rotating shaft 10 to be measured and device for detecting axial displacement 20, wherein, device for detecting axial displacement 20 comprises radially to be visited30 and processor 40. The device for detecting axial displacement that the magnetic levitation bearing system of the utility model embodiment comprisesThe device for detecting axial displacement of the rotating shaft that 20 employing the utility model embodiment provide.
In rotating shaft 10 to be measured, be provided with step. Radially popping one's head in 30 is arranged on rotating shaft 10 to be measured radially, and with step phaseTo arranging, for responding to effective area of detection the output and effective corresponding signal of telecommunication of area of detection, processor of step40 30 are connected with radially popping one's head in, for determine the axial displacement of rotating shaft 10 to be measured according to the signal of telecommunication.
Preferably, this system also comprises controller, and controller is connected with processor, for according to rotating shaft 10 to be measuredAxial displacement adjust the position of rotating shaft 10 to be measured.
Embodiment of the present utility model provides a kind of device for detecting axial displacement of rotating shaft.
Fig. 4 is according to the schematic diagram of the device for detecting axial displacement of the rotating shaft of the utility model the first embodiment. As Fig. 4Shown in, this device comprises: radially pop one's head in 30 and processor 40.
In rotating shaft to be measured, be provided with step. The step plane of a step rotating shaft to be measured can be divided into two coaxialCylinder, the diameter difference of two cylindrical cylindricals, step plane is parallel with the plane of cylinder cylindrical,Step place can be vertical ladder, also can be with certain chamfering.
Radially popping one's head in 30 is arranged on rotating shaft to be measured radially, and is oppositely arranged with step, for responding to effective inspection of stepSurvey area output and effective corresponding signal of telecommunication of area of detection. Radially pop one's head in 30 initial position facing to rotating shaft to be measuredStep place, arranges the footpath in rotating shaft to be measured between radially pop one's head in 30 initial position and step plane as the case may beTo the distance on the axial direction of direction and rotating shaft to be measured. Radially pop one's head in 30 for sensing effective detection at step placeWhen area changes, export the signal of telecommunication of respective change, wherein, effectively area of detection refers to radially to pop one's head in and 30 can feelThe distance face of 30 peripheries more nearby of radially popping one's head in two coaxial clyinders that required step plane separatesLong-pending, in the time that rotating shaft to be measured produces axial displacement, effective area of detection at the 30 step places that sense of radially popping one's head in can occurChange.
Preferably, the radially probe 30 of the utility model embodiment can be current vortex sensor. Current vortex sensor is visitedThe output of head mainly contains two influence factors, and one is the distance of probe distance detection faces, and another is that probe can be feltRequired effective area of detection.
Processor 40 30 is connected with radially popping one's head in, can be arbitrarily can executing data processing unit, for basisReceive and radially pop one's head in the signal of telecommunication of 30 outputs and determine the axial displacement of rotating shaft to be measured according to this signal of telecommunication. Processor 40For 30 signals of telecommunication that sense of radially popping one's head in are processed, determine that according to default algorithm calculates the axle of rotating shaft to be measuredTo displacement. Default definite algorithm can be to demarcate before using, and calibrates the signal of telecommunication of 30 outputs of radially popping one's head inCorresponding relation with the axial displacement of rotating shaft to be measured; Also can be to determine the signal of telecommunication of 30 outputs of radially popping one's head in effectiveRelational expression between area of detection, and the effective relational expression between area of detection and the axial displacement of rotating shaft to be measured, trueMake the relational expression of radially popping one's head between the signal of telecommunication of 30 outputs and the axial displacement of rotating shaft to be measured as default definite calculationMethod, default definite algorithm that the present embodiment adopts processor 40 is not specifically limited.
Preferably, the device for detecting axial displacement of the rotating shaft of the utility model embodiment can also comprise sensor housing,Be set in the outside of step, for fixed radial probe 30.
The device for detecting axial displacement of the rotating shaft that this embodiment provides, by be arranged on rotating shaft to be measured radially and and stepEffective area of detection of the 30 induction steps of radially popping one's head in that are oppositely arranged output and effective corresponding telecommunications of area of detectionNumber, and determine the axial displacement of rotating shaft to be measured according to the signal of telecommunication with 30 processors that are connected 40 of radially popping one's head in, separateDetermine and detected the displacement of axial detection faces as the axial displacement detection method standard of rotating shaft by axial probe in correlation techniqueThe really not high problem of property. The effective area of detection that detects the step in rotating shaft by the probe of radial arrangement, has reached and has carriedThe axial displacement detection method accuracy effect of high rotating shaft.
Preferably, the present embodiment can be used as the device for detecting axial displacement of the rotating shaft of the utility model the first embodimentThe first preferred embodiment, radially pop one's head in 30 comprise first radially probe and second radially pop one's head in. First radially pops one's head in and is used forEffective area of detection of induction step is also exported first signal of telecommunication, and second radially pops one's head in for responding to effective detection of stepArea is also exported second signal of telecommunication, wherein, and the first probe and second radially pop one's head at the axis direction of rotating shaft to be measured radiallyUpper interval predeterminable range. First radially probe and second radially pop one's head in and be all arranged on rotating shaft to be measured radially, and and stepBe oppositely arranged, due to the first radially probe and second interval predeterminable range on the axis direction of rotating shaft to be measured of radially popping one's head in,Therefore, in this preferred embodiment, in rotating shaft to be measured, at least comprise two steps, the first corresponding First of radially popping one's head inRank, the second radially pop one's head in corresponding second step and ladder opposite direction of two steps. Processor 40 is for to firstRadially probe and second two signals of telecommunication that radially probe is exported carry out difference processing, obtain differential electric signal, and according toDifferential electric signal is determined the axial displacement of rotating shaft to be measured.
Preferably, the present embodiment can be used as the axial displacement detection dress of the rotating shaft of the utility model the first preferred embodimentA preferred embodiment of putting, wherein, the first radially radially the pop one's head in straight line at place and rotating shaft to be measured of probe and secondAxis is parallel. Preferably, first radially pop one's head in and radially pop one's head in and can adopt the sensor probe that electrical quantity is identical with second.Adopt two identical sensor probes of electrical quantity, to two signals of telecommunication of two sensor probes outputs carry out difference itThe axially movable displacement y of the differential electric signal of rear output and rotating shaft is linear, and because the electricity of two probes is joinedNumber is identical, environment for use is identical, and suffered temperature is floated and pressed the impact of floating also basic identical, after carrying out difference,Can deduct the impact of the factors such as environment temperature on sensor test.
Preferably, the present embodiment can be used as the device for detecting axial displacement of the rotating shaft of the utility model the first embodimentThe second preferred embodiment, radially popping one's head in 30 comprises radially probe of many groups, radially pop one's head in for every group and comprise two radially probes,Every group of two of radially popping one's head in interval predeterminable range on the axis direction of rotating shaft to be measured of radially popping one's head in. Radially pop one's head in for every groupIn two radially the axial displacement of the rotating shaft of set-up mode and the utility model first preferred embodiment of probe detect and fillTwo set-up modes of radially popping one's head in putting are identical.
Preferably, the present embodiment can be used as the axial displacement detection dress of the rotating shaft of the utility model the second preferred embodimentA preferred embodiment of putting, every group of two of radially popping one's head in radially pop one's head in the straight line at place and the axis of rotating shaft to be measured flatOK. Preferably, radially pop one's head in for many groups and arrange along the even circumferential of step, for example, the axial displacement of rotating shaft detects dressPut and comprise two groups and radially pop one's head in, radially pop one's head in and be 180 ° of angles in the circumference angle of rotating shaft to be measured for two groups.
Preferably, the present embodiment can be used as the axial displacement detection dress of the rotating shaft of the utility model the second preferred embodimentA preferred embodiment of putting, every group of two of radially popping one's head in radially pop one's head in and adopt the identical sensor probe of electrical quantity.
Fig. 5 is according to the schematic diagram of the device for detecting axial displacement of the rotating shaft of the utility model the second embodiment. This enforcementExample can be used as the preferred embodiment of above-mentioned the first embodiment, and as shown in Figure 5, this device comprises: current vortex sensingDevice probe 61, current vortex sensor probe 62, sensor housing 63 and processor 67.
In rotating shaft 64 to be measured, be provided with step 65 and step 66, the ladder opposite direction of step 65 and step 66, chiVery little parameter is identical. Current vortex sensor probe 61 is arranged in rotating shaft 64 to be measured radially, and initial position faces toward step 65,Arrange as the case may be between the initial position of current vortex sensor probe 61 and the plane of step 65 in rotating shaft to be measuredDistance on the axial direction of 64 radial direction and rotating shaft to be measured 64, the plane of step 65 is by 64 points of rotating shafts to be measuredBe two coaxial cylinders, the plane of step 65 is parallel with the plane of cylinder cylindrical. Current vortex sensor is visited62 are arranged in rotating shaft 64 to be measured radially, and initial position is facing to step 66, at the beginning of current vortex sensor probe 62Beginning position is relative with the relative position relation of step 66 and the initial position of current vortex sensor probe 61 and step 65Position relationship is similar, does not repeat them here. Current vortex sensor probe 61 and current vortex sensor probe 62 are fixed onIn sensor housing 63. Sensor housing 63 is set in rotating shaft to be measured 64 outsides, with rotating shaft 64 outside diameters to be measuredMaximum spaced surface has predeterminable range. Alternatively, current vortex sensor probe 61 and current vortex sensor probe 62Electrical quantity identical.
Fig. 6 is according to the schematic diagram of the device for detecting axial displacement of the rotating shaft of the utility model the 3rd embodiment. This enforcementExample can be used as the preferred embodiment of above-mentioned the first embodiment, and as shown in Figure 6, this device comprises: current vortex sensingDevice probe 61, current vortex sensor probe 62, current vortex sensor probe 68, current vortex sensor probe 69, biographySensor housing 63 and processor 67.
Current vortex sensor probe 61, current vortex sensor probe 62, sensor housing 63, rotating shaft to be measured 64, platformThe set-up mode of rank 65, step 66 and processor 67 is identical with the utility model the second embodiment, no longer superfluous at thisState. Current vortex sensor probe 68 is arranged in rotating shaft 64 to be measured radially, and initial position is facing to step 65, according to toolBody situation arranges the footpath in rotating shaft 64 to be measured between the initial position of current vortex sensor probe 61 and the plane of step 65To the distance on the axial direction of direction and rotating shaft to be measured 64, initial position and the step of current vortex sensor probe 6966 relative position relation and the initial position of current vortex sensor probe 68 and the relative position relation phase of step 65Seemingly, do not repeat them here. Wherein, current vortex sensor probe 61 and current vortex sensor probe 62 are first group of spyHead, current vortex sensor probe 68 and current vortex sensor probe 69 are second group of probe, first group of probe is with secondGroup probe is evenly arranged at the circumferencial direction of sensor housing 63, and also, first group of probe popped one's head in sensing with second groupIn device housing 63, being 180 ° of angles arranges.
The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, for thisThe technical staff in field, the utility model can have various modifications and variations. All in spirit of the present utility model andWithin principle, any amendment of doing, be equal to replacement, improvement etc., all should be included in protection domain of the present utility modelWithin.
Claims (10)
1. a device for detecting axial displacement for rotating shaft, is characterized in that, in rotating shaft to be measured, is provided with step, described dressPut and comprise:
Radially probe, is arranged on described rotating shaft to be measured radially, and is oppositely arranged with described step, for inductionEffective area of detection of described step output and the corresponding signal of telecommunication of described effective area of detection; And
Processor, is connected with described radially probe, for determine described rotating shaft to be measured according to the described signal of telecommunicationAxial displacement.
2. device according to claim 1, is characterized in that, described radially probe comprises:
First radially pops one's head in, for responding to effective area of detection of described step and exporting first signal of telecommunication; And
Second radially pops one's head in, for responding to effective area of detection of described step and exporting second signal of telecommunication,
Wherein, the described first probe and described second radially pop one's head on the axis direction of described rotating shaft to be measured radiallyInterval predeterminable range.
3. device according to claim 2, is characterized in that, the described first radially radially spy of probe and described secondThe straight line at place and the axis of described rotating shaft to be measured are parallel.
4. device according to claim 1, is characterized in that, described radially probe comprises radially probe of many groups, everyGroup radially probe comprises two radially probes, and described every group of two of radially popping one's head in radially pop one's head in described to be measured turningInterval predeterminable range on the axis direction of axle.
5. device according to claim 4, is characterized in that, described every group of two of radially popping one's head in institute of radially popping one's head inStraight line parallel with the axis of described rotating shaft to be measured.
6. device according to claim 5, is characterized in that, radially pops one's head in along the circle of described step for described many groupsWeek is evenly arranged.
7. device according to claim 1, is characterized in that, described radially probe is current vortex sensor.
8. device according to claim 1, is characterized in that, described device also comprises:
Sensor housing, is set in the outside of described step, for probe radially described in fixing.
9. a magnetic levitation bearing system, is characterized in that, comprising:
Rotating shaft to be measured, is provided with step in described rotating shaft to be measured; And
Device for detecting axial displacement,
Wherein, described device for detecting axial displacement comprises:
Radially probe, is arranged on described rotating shaft to be measured radially, and is oppositely arranged with described step, for inductionEffective area of detection of described step output and the corresponding signal of telecommunication of described effective area of detection; And
Processor, is connected with described radially probe, for determine described rotating shaft to be measured according to the described signal of telecommunicationAxial displacement.
10. system according to claim 9, is characterized in that, described system also comprises:
Controller, is connected with described processor, described in adjusting according to the axial displacement of described rotating shaft to be measuredThe position of rotating shaft to be measured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521108100.2U CN205262392U (en) | 2015-12-24 | 2015-12-24 | Axial displacement detection device and magnetic suspension bearing system of pivot |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521108100.2U CN205262392U (en) | 2015-12-24 | 2015-12-24 | Axial displacement detection device and magnetic suspension bearing system of pivot |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105423889A (en) * | 2015-12-24 | 2016-03-23 | 珠海格力节能环保制冷技术研究中心有限公司 | Rotating shaft axial displacement detection method and device and magnetic suspension bearing system |
| CN106053590A (en) * | 2016-07-20 | 2016-10-26 | 重庆鼎润医疗器械有限责任公司 | Testing device for magnetic suspension thrombus elasticity |
| CN107014406A (en) * | 2017-03-16 | 2017-08-04 | 北京航空航天大学 | A kind of autodyne fraction eddy current displacement sensor for magnetic levitation bearing system |
| CN107869949A (en) * | 2017-10-26 | 2018-04-03 | 珠海格力节能环保制冷技术研究中心有限公司 | Axial displacement detection method, device and shaft position sensor |
-
2015
- 2015-12-24 CN CN201521108100.2U patent/CN205262392U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105423889A (en) * | 2015-12-24 | 2016-03-23 | 珠海格力节能环保制冷技术研究中心有限公司 | Rotating shaft axial displacement detection method and device and magnetic suspension bearing system |
| CN105423889B (en) * | 2015-12-24 | 2018-12-07 | 珠海格力电器股份有限公司 | Axial displacement detection method and device of rotating shaft and magnetic suspension bearing system |
| CN106053590A (en) * | 2016-07-20 | 2016-10-26 | 重庆鼎润医疗器械有限责任公司 | Testing device for magnetic suspension thrombus elasticity |
| CN107014406A (en) * | 2017-03-16 | 2017-08-04 | 北京航空航天大学 | A kind of autodyne fraction eddy current displacement sensor for magnetic levitation bearing system |
| CN107014406B (en) * | 2017-03-16 | 2020-06-12 | 北京航空航天大学 | Self-differential eddy current displacement sensor for magnetic suspension bearing system |
| CN107869949A (en) * | 2017-10-26 | 2018-04-03 | 珠海格力节能环保制冷技术研究中心有限公司 | Axial displacement detection method, device and shaft position sensor |
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