Non-Intrusive Piston Position Measurement System Using Magnetic Field Measurements

Taghvaeeyan, Saber; Rajamani, Rajesh; Sun, Zongxuan

doi:10.1109/jsen.2013.2259811

Cited by 31 publications

(11 citation statements)

References 11 publications

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“…A non-intrusive sensor for the position of a ferromagnetic piston in the cylinder of an aluminum combustion engine is described in [29]. The transducer utilizes the remnant magnetic field of the steel parts, which changes with time and temperature.…”

Section: Position Sensors For Pneumatic and Hydraulic Cylindersmentioning

confidence: 99%

“…A challenge is posed by the shielding effect of the conducting aluminum cylinder. Direct mounting of the sensor inside the cylinder piston or piston rod is complicated and expensive [29,30]. An optical or magnetic scale on the piston rod is not reliable, and allows only incremental position sensing [31,32].…”

Section: Position Sensors For Pneumatic and Hydraulic Cylindersmentioning

confidence: 99%

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Inductive Position and Speed Sensors

Ripka

Blažek

Mirzaei

et al. 2019

Sensors

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Magnetic position and speed sensors are rugged and durable. While DC magnetic sensors use permanent magnets as a field source and usually have only mm or cm range, inductive sensors use electromagnetic induction and they may work up to a distance of 20 m. Eddy current inductive sensors equipped with magnetoresistive sensors instead of inductive coils can operate at low frequencies, allowing detection through a conductive wall. In this paper, we make an overview of existing systems and we present new results in eddy current velocity and position measurements. We also present several types of inductive position sensors developed in our laboratories for industrial applications in pneumatic and hydraulic cylinders, underground drilling, large mining machines, and for detecting ferromagnetic objects on conveyors. While the most precise inductive position sensors have a resolution of 10 nm and linearity of 0.2%, precision requirements on the industrial sensors which we develop are less demanding, but they should have large working distance and large resistance to environmental conditions and interference.Sensors 2020, 20, 65 2 of 15 Eddy Current Inductive SensorsAn advantage of eddy current position and speed sensors is that they do not require a ferromagnetic target: Any conducting material can be used.Author Contributions: Conceptualization, P.R. and J.B.; design, calculations, and measurements: M.M., P.L., M.Š., and K.D.; writing-original draft preparation, P.R. and J.B.; writing-review and editing, all authors.

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Section: Position Sensors For Pneumatic and Hydraulic Cylindersmentioning

confidence: 99%

Section: Position Sensors For Pneumatic and Hydraulic Cylindersmentioning

confidence: 99%

Inductive Position and Speed Sensors

Ripka

Blažek

Mirzaei

et al. 2019

Sensors

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show abstract

“…The inductances increase at DC and AC with greater penetration of the iron rod inside the solenoid coil without an aluminium cylinder, because the magnetic flux reluctance decreases as the high-permeability iron rod penetrates further inside the solenoid coil. The reverse occurs when an aluminium cylinder is added to the model, due to the high reaction fields of the induced eddy currents in the aluminium cylinder shell and the lower resistance Ro in (8) and the lower corresponding equivalent inductance L. Fig. 12 shows the experimental set-up for a pneumatic position sensor.…”

Section: B Real Inductancesmentioning

confidence: 99%

“…Using of magnetostrictive delay line principle is not suitable for harsh environment [5][6][7]. Remanent field of ferromagnetic piston was used in [8] for position measurement. This approach is not practical, as the remanent field changes with time and temperature and can also be significantly changed by external magnetic fields.…”

Section: Introductionmentioning

confidence: 99%

Transformer position sensor for a pneumatic cylinder

Ripka

Mirzaei

Chirtsov

et al. 2019

Sensors and Actuators A: Physical

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A novel transformer-based sensor for a pneumatic cylinder enables measurements of the piston position to be made through a thick conductive cylinder. Unlike existing industrial solutions, which are mainly based on a moving magnet, our se nsors do not require modifications to the parts inside the cylinder. Finite element analysis results are compared with me asurements at various piston positions and excitation fre quencies. Using a suitable model for the magnetic properties of the iron piston bar, we achieved good agreement between the model and reality. When the sensor is operated at 100 Hz, the sensitivity is 200 mV/FS and the raw linearity error is 1.6% of the full 400 mm stroke.

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“…External dc magnetic sensors have been used also for the measurement of a piston position inside the cylinder of the free piston engine [9]. The disadvantage of such dc systems without the permanent magnet is that they rely on the remanence of ferromagnetic parts which may easily change with time and temperature.…”

Section: Introductionmentioning

confidence: 99%

Contactless Piston Position Transducer With Axial Excitation

2017

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Existing piston position transducers require either drilling precise hole into the piston bar, or mounting permanent magnets or measuring device inside the pressurized cylinder. We present a new solution for aluminum pneumatic cylinders, which uses the ferromagnetic bar inside the solenoid as a marker and linear array of fluxgate sensors as a scale. Instead of relying on dc remanence we use active ac excitation; the reading is resistant against external fields, both dc and ac. Using sensor array allows to compensate for temperature effects. The linear stroke of the individual sensor is 40 mm, so that array density should be about 30 mm. 1 mm position resolution is achievable. The weak point of the new transducer is the response time: for fast moving pistons the excitation frequency should be high, which leads to weaker signal and lower resolution.

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Non-Intrusive Piston Position Measurement System Using Magnetic Field Measurements

Cited by 31 publications

References 11 publications

Inductive Position and Speed Sensors

Inductive Position and Speed Sensors

Transformer position sensor for a pneumatic cylinder

Contactless Piston Position Transducer With Axial Excitation

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