bullet Sensors & Transducers e-Digest (S&T)



No. 3, March 2002



Table of Contents




Data Acquisition and Signal Processing for Smart Sensors

(Kirianaki N.V.,Yurish S.Y., Shpak N.O., Deynega V.P.)


Introducing a novel method of the dependent count for frequency-time domain sensors, this book presents a practical approach to the design of smart sensors.  The authors provide a comprehensive overview of data acquisition and signal processing methods for the new generation of smart sensors and transducers. This unique reference presents an alternative to the classical approach to data acquisition. The practical approach of the text includes coverage of the design of signal processing methods for digital, frequency, period, duty-cycle and time interval sensors. With coverage ranging from the detailed analysis of available conversion methods to software level smart sensor design, the book will have broad appeal amongst instrumentation and measurement professionals. Advanced students and researchers in microelectronics, engineers and developers of microsensor systems will appreciate the comprehensive treatment of this emerging area. 320 pages, hardcover. John Willey & Sons, UK, March 2002.



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Book cover



High Temperature Dynamic Pressure Transducers

SAN JUAN CAPISTRANO, Calif. - March 22, 2002 - Endevco Corporation is now in full production of its rugged 8540 series of high temperature pressure transducers. Available in five ranges and measuring in excess of 500 psia, these transducers can operate continuously up to 500F (260C) and to 600F (316C) for up to four hours. These pressure transducers are ideal for aircraft engine, rocket motor and other applications where stable high temperature performance is a must. The 8540 series features a high resonance frequency for dynamic measurements. Endevco's patented design affords a low noise, full-scale output of 300mV without amplification. Internal temperature compensation provides for unparalleled thermal sensitivity and zero stability over an expanded temperature range. In addition, the small diameter of the transducers allows them to be flush mounted for measuring skin pressures on aircraft, inlet distortion pressures in turbine engines, and other high temperature, space-constrained environments.


Bruce Lent,

Product Manager

ENDEVCO Corporation

Tel. 949.493.8181

e-mail: bruce.lent@endevco.com


8540 High Temperature Dynamic Pressure Transducers

MSP430 Ultra-Low-Power Microcontrollers for Intelligent Sensing


The MSP430 family of ultra-low-power 16-bit RISC mixed-signal processors from Texas Instruments (TI) provides the ultimate solution for battery-powered measurement applications. For low-power applications where both analog and digital signal processing are required, the MSP430 line provides a range of exceptional cost performance options. Using leadership in both mixed-signal and digital technologies, TI has created the MSP430 which enables system designers to simultaneously interface to analog signals, sensors and digital components while maintaining unmatched low power. The MSP430 family is suitable for applications such as: utility metering, portable measurement and intelligent sensing. New models of MSP430 Ultra-Low-Power Microcontrollers with the highest level of analog integration and the industry's lowest power consumption, the MSP430F435, MSP430F436, MSP430F437, MSP430F447, MSP430F448 and MSP430F449 provide complete systems on a chip. The MSP-FET430P440 development tool is now available. Price (1000): $4.45 to $7.03.





Texas Instruments

Analog eNewsletter,

20 March 2002

MSP430 microcontroller


Three-Channel Signal Conditioner with Smart Capability


SAN JUAN CAPISTRANO, Calif. - March 25, 2002 - Endevco Corporation's new Model 433 is a three-channel piezoelectric (PE) and ISOTRONТ (IEPE/voltage-type) signal conditioner amplifier card that is rack-mounted. The card is used with single-ended PE and ISOTRON accelerometers, remote charge converters, and the newly developed i -TEDS IEEE P1451.4 smart sensors. This unique combination of i -TEDS sensors and intelligent electronics provides a winning solution for modal test labs. Data entry errors are virtually eliminated, and signal conditioning set-up time is minimized. i -TEDS sensors contain all pertinent data, which automatically loads into a softw are database with a single mouse click. Each Model 433 card has an independent microprocessor, providing fast data transfer with increased reliability. Gain is programmable from 0 to 1000 while accuracy is 0.5% at 1 kHz for gain >1.0. The three-channel card is designed for use with Endevco's Model 4990 and 4998 racks. The 4990 rack is remotely controlled via Ethernet or RS-232 interface and holds up to 16 of the 4xx series of amplifier cards. The 4xx series amplifier card family includes (1) Model 428 dual-channel PE/ISOTRONТ amplifier card with isolation, (2) Model 436 three-channel non-isolated bridge amplifier card, and (3) Model 482 eight channel i -TEDS amplifier card. The Model 4998 rack is a low-cost, space saving option that holds up to four OASIS-4XX cards, and up to four Model 4998 racks can be linked to one RS-232 com port.


Endevco is the world's leading designer and manufacturer of dynamic instrumentation for vibration, shock and pressure measurements. The company's comprehensive line of piezoelectric, piezoresistive, variable capacitance, ISOTRONТ and force balance accelerometers are used to solve measurement problems in a wide variety of industries including aerospace, defense, automotive, medical, industrial and marine. Other Endevco products include pressure transducers, microphones, electronic instruments and calibration systems.



Three-Channel Signal Conditioner (model 433)

VibraCal Lite Automatic Accelerometer Calibration System Provides NIST Traceability


SAN JUAN CAPISTRANO, Calif. - March 25, 2002 - Endevco Corporation's new VibraCal Lite (Fig.1) is an entry-level priced automatic calibration system that provides NIST traceable back-to-back comparison calibration of most accelerometer types, ranging from charge and voltage type piezoelectric to bridge type piezoresistive sensors. VibraCal Lite is well suited for the budget-conscious metrology lab whose immediate plan is to purchase or lease a state-of-the-art automatic accelerometer calibration system to both satisfy ISO 9001 requirements and replace outdated calibration instruments.


Accelerometer Calibration System


VibraCal Lite with its modular concept can also satisfy their future plan to increase the sophistication of this system. Test accelerometer output could be single-ended or differential, AC or DC coupled, isolated or grounded. The system complies with ANSI/NCSL 540-1-1994 and ISO Guide 17025:2000. The vibration system utilizes modular design and consists of a controller, a Bruel & Kjer PULSE Signal Analyzer, and an Endevco model 2926 shaker. The PULSE Signal Analyzer measures the auto-spectra of the transducer signals and the cross-spectrum between them. It then calculates the transfer function between the two signals. The Signal Analyzer also generates the random noise or sinusoidal signal supplied to the  vibration exciters. The mid-range frequency shaker has its own integrated power amplifier. System operational software is based on National Instruments' Windows LabView. Test configurations and test data are stored and managed using MicrosoftТ Access database. Tests may be automatically set up by recalling a particular test definition file, which is specific to each transducer model. No operator adjustments are required for the particular gain, grounding and vibration levels. Computer control helps eliminate operator error, enhances repeatability, and ensures optimum signal-to-noise ratio and calibration accuracy.



About Metrology -- Series 1 (EOTC NEWS, January 2002)


Metrology can be defined as the science of measurement and covers three main tasks:

- The definition of internationally accepted units of measurement, e.g.the metre.

- The realisation of units of measurement by scientific methods, e.g. the realisation of a metre through the use of laser beams.

- The establishment of traceability chains in documenting the accuracy of a measurement, e.g. the documented relationship between the micrometer screw in a precision engineering workshop and a primary laboratory for optical length metrology.


In the EU, metrology is separated into three categories with different levels of complexity and accuracy. Scientific Metrology deals with the organisation and development of measurement standards and with their maintenance (highest level).  Industrial Metrology has to ensure the adequate functioning of measurement instruments used in industry as well as in production and testing processes. Legal Metrology is concerned with the accuracy of measurements where these have influence on the transparency of economical transactions, health and safety.







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