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Eddy current sensors
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A
selection of recently
published
technical
articles, white papers, products
&
application examples: |
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| New eddy current sensors
with integrated EEPROM |
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 A
company renowned for its eddy current sensors,
Micro-Epsilon, is now offering a completely new
series of eddy current sensors. The new eddyNCDT 3100
series includes a special, compact controller and
corresponding new sensors. Sensors and cables are
equipped with an integrated EEPROM chip, which includes
all critical characteristics. In the case of a sensor
needing to be replaced, only a simple 3-point
calibration is required. All important configuration and
set up parameters are automatically transmitted from the
sensor to the controller. All sensors are factory
calibrated to adjust to ferromagnetic and
non-ferromagnetic materials. Therefore, a precise
definition of the measuring object is not required in
advance. The controller housing, including mounting
rail, is made from aluminium and protected to IP65. The
device itself does not have any viewable operational
functions. All settings are carried out via a web
browser independently of the operating system.
Therefore, no additional software is required. The
sensors are securely connected using a PTFE cable of 3m
or 9m in length and protected to IP67. Seven sensor
models are currently available, covering all common
applications. Further sensor models will follow. The new
series presents a high-end device that is delivered from
stock, including appropriate sensors. A simplified
sensor changeover is important for each application,
where different sensors are being used, such as ... |
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Eddy current sensors with Embedded Coil
Technology |
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 Micro-Epsilon
has developed a completely new manufacturing technology for eddy current
sensors. Using “Embedded Coil Technology” (ECT), the sensor is housed in
an inorganic carrier material, which provides temperature and shape
stability. Conventionally wound sensor coils are replaced by ECT; the
carrier material can even hold electronic components. The technology
provides more freedom in the physical design of the sensors; in the case
of special operating environments, the ECT sensors can be easily adapted
to the conditions. The electronics are either integrated in the sensor
or are housed separately. The significant benefits of ECT technology are
its high operating temperatures of up to 350°C, extreme temperature
stability, high mechanical load capacity and its suitable for use in
strong electromagnetic fields. Due to a hermetically sealed enclosure,
the sensors can also be used in ultra high vacuums. The new sensor
technology has already proved itself in many challenging applications.
Due to their high temperature stability, ECT sensors are used for ... |
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Eddy currents – magnetically controlled |
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 Due
to be launched at the Hanover Trade Show and Sensor + Test, is a new
product range from Micro-Epsilon called mainSENSORs
(“Magneto-inductive”). The standard MDS-40 M30 industrial version has a
40mm measuring range and an M30 cylindrical stainless steel housing. The
OEM alternative, the MDS-40MK, has a miniature square plastic housing
and also provides a 40mm measuring range. Other advantages of these
sensors are their very compact design relative to the measuring range,
as well as extremely attractive price-performance ratios. Over many
years, Micro-Epsilon has been renowned as a specialist supplier of eddy
current displacement sensors. This technology enabled the technological
core of the new sensors range to be developed. The new sensors offer a
combination of high speed and high resolution measurements. The sensors
also benefit from extremely high basic sensitivity and temperature
stability. A small permanent magnet on the measurement object is used as
the target ... |
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A
selection of recently
published
technical
articles & products:
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Z-Height Measurement with Capacitive and Eddy-Current Sensors |
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 Lion
Precision: Z-height measurement, or any measurement of
critical position in one axis, is a common need in many
industries. Many engineers have struggled with trying to get an
accurate measurement of sufficient resolution while coping with
design requirements and implementation problems caused by
limited space, temperature changes, vacuum, target surface
interference, and damage to measurement probes resulting from
incidental contact with the target. Capacitive and eddy-current
noncontact displacement sensors are becoming a standard
technology for these applications because of their small size,
flexibility, ease of use, high resolution, and robust design.
Capacitive sensors and
eddy-current sensors can also be easily customized to fit in
specific applications. Technologies: Many technologies have been
applied to these measurements, each with its own set of
challenges. Contact gauging can damage target surfaces. Optical
gauging can suffer from thermal sensitivity, inconsistent
reflectivity of the target material, and may be difficult to fit
in the space required. Some capacitive technologies can suffer
damage to internal electronics if the end of the probe touches a
grounded surface. Lion Precision capacitive and eddy-current
sensors are robust, thermally compensated ... |
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NASA Stennis Space Center Awards Sensor
Development Contract to Lion Precision |
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Lion Precision, a leading manufacturer of high-performance
eddy-current sensors / displacement sensors, was awarded a Cooperative
Agreement with NASA’s Stennis Space Center to develop a smart sensor and
the associated communication protocols to monitor valve position and
wear. The eddy-current sensors / displacement sensors will monitor
valves responsible for the flow of liquid oxygen and liquid hydrogen in
rocket engine test cells. Sensor measurements and sensor health
information will be transmitted using MTConnect communication protocol.
Development of the system will require the expansion of MTConnect to
include new XML tags for sensor measurement and health parameters. Don
Martin, president of Lion Precision, is the chairperson of the Sensors
Working Group for MTConnect. Rocket engine tests are very expensive to
perform. Failures during the test require scrapping and later repeating
the test at great expense. To help prevent failures, the sensors will
monitor the condition of critical valves. The sensors will provide a
precise measurement of the final seated position of the valve when
closed. That position verifies that the valve is closed and also
indicates valve wear. This data will inform operators when a valve
requires maintenance rather than waiting until it fails or performing
costly, unnecessary maintenance at a predefined time interval. The
sensors will also monitor their own functionality and report any
apparent malfunctions of the sensing system. ... |
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Combination sensor system for
single-sided thickness measurement |
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 Sensor
specialist Micro-Epsilon is relaunching its proven combination
sensor, the KS5. The new KSH5 has been developed even further and now
combines a capacitive sensor and an eddy current sensor with additional
integrated temperature measurement, in a single, compact sensor module.
The combination sensor is used for single-sided thickness measurement of
plastics. Both sensors measure without making contact with the target
and measure continuously in one axis on the same measuring spot. This
means that the combination sensor offers significant benefits when
compared with conventional designs in which multiple sensors are
positioned adjacent to one another. The sensor has a measuring range of
5mm and for the first time has been produced using a unique ECT
production technology recently developed by Micro-Epsilon. Even higher
resolution , very high temperature stability and longer service life
combined with a very compact sensor housing are just some of the
benefits that customers will see from this new technology. A special,
optimised combination connector is provided, which means that output
signals from temperature measurements, the capacitive sensor and the
eddy current sensor can be transmitted in a single connection ... |
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+ Info |
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High-Performance Eddy Current Sensor
Offers Improved Displacement Measurements |
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 Lion
Precision: The ECL101 Eddy-Current displacement sensor is an
improved, CE compliant version of Lion Precision’s original ECL100
sensor. The ECL101 noncontact sensor offers improvements in immunity to
electromagnetic interference (EMI) and thermal stability as well as
lower power consumption. The linear output sensor is available with a
selection of probes offering measurement ranges from 0.5mm to 15mm, and
features a unique front panel range indicator to alert the operator to
out-of-range conditions. The sensor has applications in any industry
requiring precision noncontact displacement measurement, especially in a
hostile environment involving fluids or debris in the measurement area ... |
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+ Info |
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More technical articles & products to this topic:
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Find
all manufacturers and suppliers of
eddy current sensors |
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New measuring principle for low cost displacement sensors |
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Micro-Epsilon
has developed a completely new displacement measurement principle with
its new Magnetic Displacement Sensor (MDS). In contrast to the widely
used Hall Effect principle, the MDS is based on a method patented by
Micro-Epsilon, which is based on a linear relationship between the
position of the magnet and the output signal. As printed coils are used
for this measurement principle, the manufacturing method does not depend
on semiconductor processes. This makes customer-specific adaptations
considerably easier. The sensors have an extremely high basic
sensitivity, which enables a very simple and low cost evaluation
circuit. With an eddy current sensor as the technological core, very
fast, high resolution versions can be achieved. Compared to Hall Effect
sensors, much larger measuring ranges (currently 60mm limit) can be
achieved. In addition, significantly smaller magnets are required as the
target. ... |
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Noncontact Displacement Sensor for National Instruments CompactRIO
System |
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Lion Precision: The new ECD140 sensor, scheduled for release in
Q4 2009, will add displacement and position data to test, measurement,
and control systems designed around National Instrument’s CompactRIO
architecture. Based on eddy-current (inductive) sensing technology, the
new sensor provides displacement measurements of conductive targets with
sub-micron resolutions and measurement ranges of 2mm to 3.5mm. Other
ranges are also available upon request. A fully functional ECD140 will
be demonstrated during NI Week in Austin, Texas August 4-6 (www.ni.com/niweek).
The CompactRIO system from National Instruments is an open, expandable
system powered by LabVIEW. The system allows hot swapping of a multitude
of modules to quickly configure a data acquisition system. No other
noncontact displacement sensor module is available for the CompactRIO
system ... |
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Find
all manufacturers and suppliers of
eddy current sensors |
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Customer-specific eddy current sensors
for OEMs |
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Micro-Epsilon
provides extremely flexible solutions in the area of eddy current
sensors for OEM applications. This flexibility ranges from cost-optimised
sensor systems with highly integrated electronics through to innovative
sensors with silver/palladium coils embedded in glass/ceramic. In this
way, these sensors achieve high levels of temperature stability and
service life that were previously not possible. The sensors can also be
used in the most difficult operating conditions (pressure, temperature,
aggressive media, high vacuum). The sensors are easily adapted in terms
of form, size and design. Separate electronics is not necessary as all
the sensor’s electronic components can be incorporated in the
multiple-layer ceramic substrate. Therefore, solutions with detached and
with integrated electronics are now possible. Sensors with a
glass/ceramic substrate are intended for applications in aerospace and
defence, semiconductors, power station construction or for industrial
applications with high loads. The sensors can also be used in clean
rooms or in an ultra-high vacuum as they are hermetically-sealed and
offer correspondingly low gas emission rates. Micro-Epsilon therefore
provides a cost-efficient solution for OEMs to develop and supply eddy
current sensors for individual ... |
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Eddy current sensors in tribology testers |
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Eddy
current sensors from Micro-Epsilon are once again being used in a
new high-performance test system at the Institute for Tribology at the
Clausthal Technical University. The new tester, which is currently under
construction, will be used to examine the tribological, flow mechanics
and rotor dynamic processes of highly loaded sliding bearings at maximum
circumferential speeds of the shaft. Based on previous positive
experiences with Micro-Epsilon eddy current sensors used on existing
testers for examining hydrodynamic radial plain bearings or plain
bearings with particularly high loads, eddyNCDT series sensors will also
be used in the new tester. In doing so, the shaft reaches
circumferential speeds of up to 200m/s; conventional test systems
achieve a maximum of 120m/s. The position of the test bearing housing
and the relative movement between the rotor and the test bearing is
detected in the tester using eddy current displacement sensors. The
bearing gap of the plain bearing between bearing surface and rotor is
also measured using eddy current sensors. Or this, 22 sensor channels
will be integrated in the test structure. Miniature eddyNCDT sensors
with 0.5mm measuring range are used due to their high cut-off frequency
and high resolution. Another key criterion is the sensor’s small
installation footprint. Therefore, measuring points for very tight
installation requirements are possible without requiring any disruptive
modifications to the test design. High environmental compatibility is
also a key reason for selecting eddy current sensors: oil or water in
the measuring gap, high temperatures or strong electromagnetic
interference ... |
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Micro-Epsilon receives large sensor order
for segmented reflector telescope |
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Sensor
specialist Micro-Epsilon has received an order from the Chinese
Academy of Science to supply 600 eddy current sensors to the largest
Chinese reflector telescope LAMOST (Large Sky Area Multi-Object Fibre
Spectroscopic Telescope). The telescope is located in the Chinese
observatory Yinglong Station near Peking. LAMOST is a new type of
segmented reflector telescope for the spectroscopic surveying of space.
A primary mirror receives the light from space and directs it to a
correction mirror, which is in the focus of the primary mirror. The
corrector, in turn, bundles the light information on an optical element
such as, in this case, the fibre optic cable. The telescope has a
primary mirror diameter of approx. 4m. The primary mirror and corrector
comprise 46 or 24 individual mirror segments. The segments can be moved
and can therefore be adjusted to different receiving angles between -10°
and +90°. Due to the high optical resolution, the mirrors must be
precisely aligned with each other. 600 eddy current sensors from
Micro-Epsilon are used to achieve the required precision. The sensors
were selected because of their sub-nanometre resolution ... |
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Noncontact position sensor exploits FPGA
technology for higher performance |
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The new ECL202 eddy-current displacement/position sensor has
significantly improved thermal stability and immunity to electromagnetic
interference (EMI) as well as improved linearity and resolution. The
sensor employs FPGA technology enabling complex, proprietary
mathematical algorithms to achieve higher performance levels than purely
analog methods. According to Don Martin, president of Lion Precision,
“Using FPGA digital processing techniques, we can achieve performance
that simply is not possible with discrete analog electronics.” Digital
technology can very precisely detect the sensor’s signal and more easily
differentiate it from other electrical signals present in the sensing
environment. This means the sensor continues to work well in
electrically noisy environments such as near motor controllers or other
high-power switching electronics. Using this same proprietary method,
multiple ECL202 sensors can be positioned near each other without the
mutual interference usually experienced with eddy-current sensors. ... |
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Turbocharger speed sensor for high volume
production |
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New
from Micro-Epsilon is a range of turbocharger speed sensors for
high volume production. The turboSPEED TSSC series of sensors operates
according to the eddy
current principle and so provide several benefits. The sensor is
cast in plastic and has a separate electronics unit, which can be
integrated in the engine compartment separate from the turbocharger.
Speeds of 200 to 400,000rpm can be measured accurately with the sensor.
Due to the complex electronics and special linearisation, the sensor can
measure on turbine wheels made from aluminium or titanium. Titanium is
well known as a poor electrical conductor and is therefore generally
difficult to measure. The electronics for each turbine model is
configured and fixed afterwards for high precision. The low cost version
of the sensor meets all necessary requirements for the
automotive industry. The housing is protected to IP67; the
electronics complies with the EMC requirements in the engine
compartment. Different from conventional sensors for turbochargers, the
new sensor does not measure on the shaft between the two turbine wheels,
since these are often no longer accessible with the latest
turbochargers. The turboSPEED TSSC detects the edge of the compressor
wheel on the “cold” side of the turbocharger ... |
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More technical articles & products to this topic:
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all manufacturers and suppliers of
eddy current sensors |
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