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Vol. 65, No. 3, March 2006




Table of Contents










Evolution and Future of Torque Measurement Technology


The journey to the past of torque measurement technology begins in the 17th century. It takes us from the first incipiencies of torque measurement to the problem of the transfer of the measurement signal from a rotating shaft, which existed for several decades. This task was solved by the integration of high-precise digital measuring amplifiers in the torque sensors, which is expressed by broad application fields, today. The future will appertain to highly dynamic measuring sensors as well as to intelligent torque sensors, which are able to transmit their sensor-specific characteristics to evaluation devices.


Dr. W. Krimmel

Lorenz Measurement Technology GmbH




Multilayer Based Technology to Build RTD Fluxgate Magnetometer


In this paper we discuss the main features of the Residence Times Difference Fluxgate Magnetometer. A low-cost technology, negligible onboard power requirements and the intrinsic digital form of the readout signal are the main advantages of the proposed strategy. Results obtained show the possibility to realise low-cost devices exploiting Printed Circuit Board (PCB) technology for applications requiring resolution in the nanotesla range as the ferrous object (or particles) detection, being the performance obtained suitable to detect the presence or the transit of ferrous materials via their interaction with the geomagnetic field.


Ando B., Baglio S., Caruso V., Sacco V., Bulsara A.

DIEES, University of Catania, Italy



Novel Magnetic Field Meter Based on Giant Magneto-impedance (GMI) Effect


A novel magnetic field GMI-sensor/meter has been invented and designed. Its laboratory model was constructed and tested, demonstrating the sensitivity of 1.10–8 T (100 mGs). The principle of operation of this meter is based on changes of the quality factor of the resonance circuit a part of which is a magnetic GMI sensing element. These changes are due to variations in the real component of the impedance of this element caused by an external DC-field. The sensing element is in the form of a piece of the “non-magnetostrictive” amorphous ribbon. Magnetic field modulation of an acoustic frequency and feedback circuit (compensating field) applied to the device, significantly increases stability and linearity of the measuring system.


Nesteruk K., Kuźmiński M. and Lachowicz H.K.

Institute of Physics, Polish Academy of Sciences,

Warszawa, Poland





High Accuracy Fiber Optic Temperature Sensor for Medical Application


Opsens’ fiber optic temperature sensor is designed to perform in stringent medical environments, offering high accuracy and resolution 0.01°C in the fiber optic temperature sensing industry. Using the temperature-dependant birefringence of selected monocrystalline material, the sensor can now accommodate easily to different sizes and accuracy levels. Furthermore, the sensor shows no thermal creeping or aging.


Combined with Opsens’ white light polarization interferometric technology and the inherent advantages of fiber optics, the OTP-M is able to provide accurate reading under the presence of harsh EMI, RFI and electro-surgery environments.


Compatible with all Opsens’ WLPI signal conditioners, this compact and robust temperature probe is customizable according to client specific or low cost OEM applications ...


MengChe LOOI

Opsens, Sainte Foy, QC, Canada

T: +1.418.682.9996

E-mail: mcl@opsens.com

Fiber Optic Temperature Sensor



Triaxial Force Sensors Measure Vehicle Chassis Dynamics


Depew, NY, USA - The 260A Series Triaxial Force Sensors from the Force/Torque Division of PCB Piezotronics, Inc. (PCB) simultaneously measure dynamic and quasi-static forces in three orthogonal directions (X, Y, and Z-axes). The sensors are used to study vehicle chassis dynamics at interfaces between shock absorbers, struts or other chassis components.


Triaxial force sensor measurements supplement vibration measurements in automobile chassis research by providing the input force that drives the dynamic response from the chassis to the vehicle. The 260A series features full-scale measuring ranges from 500 lb to 4,000 lb (2.2 kN to 18 kN) in the X and Y directions and from 1,000 lb to 10,000 lb (4.5 kN to 45 kN) in the Z direction. Single axis models are also available ...


Peter Munschauer,

Division Manager,

Force/Torque Division, 3425 Walden Avenue,

Depew, NY 14043-2495 USA,

Tel.: (888) 684-0004 ext. 2405, fax: (716) 684-8877

E-mail: pmunschauer@pcb.com

Triaxial Force Sensors 260A



Detecting Unit of Gamma Radiation for Automated Systems of Radiation Monitoring


Lviv, UA - The series BDBG-09 Detecting Unit of Gamma Radiation from EcoTest, a leading manufacturer of radiation measurement instruments and control devices, can be used both within informational indicator panels and automated systems of radiation monitoring to measure of ambient equivalent dose rate of gamma radiation.


The BDBG-09 series features measuring ranges from 0.1µSv/h to 10 Sv/h or  from 0.1 μSv/h to 100.0 Sv/h (on request); energy range of gamma radiation 0.05 ... 3.00 MeV; integration time 2...420 s.Data exchange between the detecting unit and the system of data indication is performed via the RS-485 interface ...


PE SPPE Sparing-Vist Center

33 Volodymyr Velyky str.

Lviv, 79026 UA

Tel./fax: +38 (0322) 971115, 642423


BDBG 09 Detecting Unit of Gamma Radiation



Strain Sensors Measure Quality on Resistance Welding Machines


March 2, 2006, Depew, NY, USA - New Series JM240 ICP Ground Isolated Strain Sensors from the Force/Torque Division of PCB Piezotronics, Inc. (PCB) use piezoelectric sensing elements to indirectly measure dynamic and quasi-static stress forces on resistance welding machinery structures. ICP Strain Sensors feature sensitivity stability, repeatability, high resolution, and extremely long life. Mounted on a C-frame or actuator with a single screw keeps the sensor out of the current flow and high electrical noise environments do not affect the ground-isolated design.


Weld quality is directly affected by electrode force, and -- in typical applications -- the sensor is used to verify that the clamping force has reached a desired minimum value before applying weld current. The strain signal may also trigger weld current, which cuts cycle time by applying weld current immediately upon reaching the desired force, and avoids electrode damage due to premature current application. Sensor data may be used to trend electrode tip wear, capture process deviations, and document the process to ensure delivery of zero defect product components ...


Bob Metz

PCB Piezotronics, Inc., Force/Torque Division

3425 Walden Avenue

Depew, NY 14043-2495 USA

Tel.: (888) 684-0004 ext. 2683, fax: (716) 684-8877

E-mail: bmetz@pcb.com

Strain Sensors series JM240



New Air Velocity Transmitter Series EE75 from E+E Elektronik


The new air velocity transmitter EE75 from E+E Elektronik has been designed for accurate measurement of air speed and gas flow between 0 and 40m/s (0…8000ft/min). The high-quality hot film sensor element is based on state of the art thin film technology and guarantees highest sensitivity even at very low mass flows. The innovative construction of the sensing head reduces to a minimum the impact of the mounting angle on the measurement results.


The EE75 can detect and measure even smallest flow changes due to temperature variation, whereby resulting fluctuations of the output signal can be suppressed by the user by software settings.  The temperature compensation integrated in EE75 reduces to minimum the influence of temperature on the gas velocity measurement. The robust metal housing allows the use of EE75 at process temperatures between -40 and 120°C (-40…248°F) ...


Ing. Werner Hentscholek

E+E Elektronik GmbH

Langwiesen 7, A-4209 Engerwitzdorf, Austria

Tel.: +43 – 7235-605-0, fax: +43 – 7235-605-8

E-mail: info@epluse.at

Air Velocity Transmitter



Larson Davis Receives Additional ATEX Approvals for Spark Personal Noise Dosimeters


March 1, 2006, Provo, UT, USA - Larson Davis, a PCB Group Company, announced that it has received European ATEX approvals (II 2 G, EEx ib IIB T4) for its Spark dosimeters. The approval extends to all of the dosimeters in this product family: 703, 703+, 704, 705, 705+, 706, 706RC, which allows them to be used in hazardous surface locations for Industrial Hygiene and worker safety applications.


Larson Davis Spark Dosimeters combine ease-of-use and strength in a miniature, lightweight package. With seven intrinsically safe models available, Spark provides days of operation on just two AA batteries, and has a windscreen that stays secured between calibrations. When used with Blaze Noise Exposure Analysis software, personal noise dosimeter data can be converted into concise reports and full-color graphics ...


Ms. Molly Bakewell,

PCB Piezotronics,

3425 Walden Avenue,

Depew, NY 14043-2495

Tel: 716.684.0002, ext. 2663

E-mail: mktg@pcb.com

Spark Personal Noise Dosimeters



Digital Pressure Gauge Offers Easy-To-Read, Accurate Pressure Measurement

in Corrosive Media


Mount Olive, NJ, American Sensor Technologies introduces a new media isolated, high-quality digital pressure gauge designed for use with any gas, liquid or solid media that is compatible with 17-4 PH stainless steel. Incorporating a solid one-piece, 17-4PH high-strength stainless steel sensing element that is free of welds, internal O-rings and fluid-filled cavities, the AccuGauge Media Isolated Digital Pressure Gauge is ideal for applications that require high proof and burst pressures.


The AccuGauge Media Isolated Pressure Gauge offers pressure measurement accuracy of <+0.5% of Full Scale, BFSL (including Non-linearity, Hysteresis, and Non-repeatability) over operating temperature ranges of -10º to 70ºC (-10º to 160ºF) ...


Karmjit Siddhu

AST, Inc.

450 Clark Drive, Mt. Olive, NJ  07828

Tel: (973) 448-1901 * Fax: (973) 448-1905

 E-mail: ksiddhu@astsensors.com

Digital Pressure Gauge



Handheld Sound Level Meter/Analyzer for Environmental Noise Analysis


March 15, 2006, Provo, UT, USA - Larson Davis, a PCB Group Company, has introduced the Model 831, a Class 1 handheld sound level meter with exceedance-based logging analysis (ELA) for community noise assessment.


Model 831 features a small, lightweight ergonomic design; real-time 1/1 and 1/3 octave spectra, and comes standard with a 120 dB dynamic range. Ten customizable markers are provided to annotate time history data. The sound level meter also has audio and voice recording with replay, supported by up to 2 GB of on-board memory and optional USB 2.0 data stick ...


Dr. John Carey

Larson Davis, Inc.

1681 West 820 North, Provo, UT 84601

Tel: 801.375.0177, fax: 801.375.0182

E-mail: jcarey@larsondavis.com

Sound Level Meter/Analyzer



First Handheld Vibration Spectrum Analyzer / Data Collector


CAMPBELL, CA, - Datastick Systems, Inc., announced its first customer shipment of the VSA-1212 Vibration Spectrum Analyzer, the first PDA-based vibration analyzer to provide open, non-proprietary desktop PC software built on a foundation of Microsoft® Excel®.


The system includes the new Datastick® VSA-1212 Vibration Spectrum Analyzer module that attaches securely to select PDAs running Palm OS; new Datastick Spectrum handheld software that collects and stores vibration measurements while displaying them in time waveforms and FFT spectra complete with alarm levels; and Datastick Reporting System(TM) (DRS) software for PCs, which is based on Microsoft Excel. Vibration data from the PDA exports to the PC with a single press of a button and loads into the DRS workbook on the PC with two mouse-clicks.


The VSA-1212 module is designed to use standard ICP®-type industrial accelerometers. The Datastick Spectrum software that runs on the PDA places all the vital waveform or FFT spectral information on one screen. Data can be shown in terms of acceleration, velocity, or displacement. Versatile cursor-point tools enable precise zooming and numerical readout of any data point, and can show the relationship between any two data points. An "Add Note" feature allows the user to attach written observations to individual waveform or spectrum captures ...


Michael Scandling,

V. P. Marketing

Datastick Systems, Inc.

Tel.: (408) 871-3300

Email: findout@datastick.com

VSA-1212 Vibration Spectrum Analyzer



ISSYS Inc. Awarded a Patent for Wireless, Batteryless, Implantable Sensors


YPSILANTI, MI - 03/09/2006 - Integrated Sensing Systems, Inc. (ISSYS) announced today that the U.S. Patent Office has granted a patent entitled "Implantable Sensing Device for Physiologic Parameter Measurement" (US Patent No. 6,968,743), which covers the design, fabrication and manufacturing of miniature, wireless, batteryless, implantable sensors.


This awarded patent is the first out of ten pending patents by ISSYS for its MEMS (Micro-Electro-Mechanical Systems) technology for safe, chronic, fast, detailed, real-time, continuous, bio-pressure measurements. This technology supports the trend towards home health monitoring and has the potential to revolutionize the way many diseases are treated. The particular targets of ISSYS products are cardiovascular disease, especially congestive heart failure, and hydrocephalus (high brain pressure) disease ...


Dr. Cathy Morgan

Integrated Sensing Systems Inc. (ISSYS)

391 Airport Industrial Dr., Ypsilanti, MI 48198

Tel: (734) 547-9896 Ext. 118

Fax: (734) 547-9964





Multisensor Data and Information Processing

(Special Issue, August 2005)


S&T Special Issue's cover





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