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

 


 

No. 4, April 2002

 

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Table of Contents

 

BOOKS

Ramon Pallas-Areny and John G. Webster,

Sensors and Signal Conditioning, Second Edition. Book review

 

Every book published in a sensor related area is a great event in all scientific world, because of today, sensors are everywhere … It is also true for the second edition of Sensors and Signal Conditioning written by Ramon Pallas-Areny (Universitat Politecnica de Catalonian) and John G. Webster (University of Wisconsin, Madison). So what is in this book ? This book provides a comprehensive and practical source of information on sensor principles and signal conditions in a single 608 pages volume and shows how electronics components and sensors should be combined to create reliable, high accuracy and optimal measuring systems from different points of view . This book is both: a second edition of an earlier book, and a new work. In comparison with the first edition of Sensors and Signal Conditioning successful book the second edition has been significantly expanded and added by new information about sensor materials and microsensor technology, variable CMOS oscillators and other digital and smart sensors, a wide range of new sensors as well as examples and tasks.

 

From introduction to sensor-based measurement systems this book illustrates the path that leads an engineer at his design stage from sensors fundamentals, working principles advantages and limitations, equivalent circuits through the signal conditioning for different sensors and sensing methods, ending in practical application. The book covers a wide range of different sensors logically grouped depending on variable parameters (resistors, inductors, capacitors), generating outputs (voltage, charge, current), etc. There are also many new sensors, described in this book: giant magnetostrictive sensors, resistive gas sensors, liquid conductivity sensors, SQUIDs, flux-gate magnetometers, semiconductor-junction nuclear radiation detectors, CMOS image sensors, biosensors and much more. The book is very well illustrated and each from its nine chapters is supplemented by well-selected references. There are a lot of tables containing characteristics to consider in sensor selection, sensors specifications and others. One of the big advantage and important feature of this book, it is 68 worked-out examples and 103 end-of-chapters tasks (problems) with solutions from actual design cases. I am going to use a lot of them in my lecture course on Data Acquisition and Signal Processing for Smart Sensors. Thank you, authors !

 

And at the end of this short book review I would like ask you a question, my Dear Reader: do you know how to measure, for example, an unknown resistance with the help of one-chip microcontroller and connect a resistive bridge to the microcontroller without an embedded ADC and any other converters ? The answer is also in this book…

 

It is obviously that this book will be very useful for graduate and PhD students, engineers and researchers as well as lecturers. I have this book and enjoy it. Great job !

 

For book details and on-line order click <here>.

Editor's signature

Prof., Dr. Sergey Y. Yurish,

S&T e-Digest Editor

Transparant

Sensors and Signal Conditioning book cover

 

PRODUCTS

New Real-Time Electronic Tactile Sensor

Sensor Products Inc. introduces Xsensor, a new electronic tactile force and pressure indicating sensor. Xsensor allows an engineer to monitor precisely how force is disbursed between any two contacting or mating surfaces in real-time while the event occurs. Any application of test where pressure lies between .01 PSI to 12,000 PSI (0.007 kg/cm2 to 845 kg/cm2) is a viable candidate for Xsensor technology.

 

Xsensor is a valuable aid in machine calibration unit pressure distribution between components of machine assemblies such as gaskets and flanges, clutch and brake plates, frames, shafts, welding heads, teeth of gears, glue and adhesive jigs, roller nips for steel mills, and electronic component packaging. Other applications are as diverse as ultrasonic welding, explosive forming, indication of uniformity during composite materials fabrication, determination of effective placement of strain gauges, determining drawing pressure in dies, package drop test pressure, and measuring the interface pressure in mechanically attached joints. In general, any application involving stress between two surfaces can benefit from Xsensor's capabilities.

 

Xsensor is a Windows-based system that consists of an electronic sensor element "skin", an interface controller, and software. The sensor skin is essentially a thin flexible sheet that is densely packed with sensing points or pixels. These sensing points can be spaced as close as 1 mm (.04") apart and can collect data as rapidly as 500 times per second. The Xsensor sensing element is only 18 mils, allowing adaptation over curved surfaces or invasive intolerant environments. The Xsensor element's internal structure is very durable and can be utilized for thousands of tests before replacement is necessary. The sensor system is pre-calibrated and requires minimal user training prior to operation. System requirements for Xsensor are Windows 95/98/2000/XP operating systems, 16 MB free disk space and 64 MB RAM.

   

 

Bill Ebner

Phone: +1/973.560.9092

E-mail: bebner@sensorprod.com

http://www.sensorprod.com

Tactile sensor

Software>  

Software screen

<Tactile Sensor

Precision Locknuts

 

Arontec Corporation, Taiwan, supplies precision locknuts for the aircraft industry, national defense projects and manufacturing technology. For example, Okuma Corporation and the Tsubakimoto Precision Products Company, Japan. Precision locknuts have the advantage of providing a simple way of upgrading a shaft accurately. In addition, they are easy to adjust at right angles to the shaft, thanks to good balance and a high-precision finish designed for efficient locking, (ground end squareness to 0.002mm). Furthermore, these locknuts are economic. They are simple to mount and dismount, are re-useable, and they eliminate the need for expensive keyway machining.

Precision Locknuts

 

T. S. Lai, Business Department

Arontec Corporation, Taiwan

E-mail: arontec@pchome.com.tw

 

CMOS Line Scan Sensor PDI-CIS120DA

 

The PDI-CIS1200A is a low noise image sensor for 600dpi and 1200dpi applications. The PDI-CIS1200A consists of a 512x1 array of photodiodes, associated charge amplifier circuitry, and pixel-level correlated double sampling [CDS] that reduces both fixed pattern and random noise. The pixel pitch is 21.15um. In order to increase the scan rate, the PDI-CIS1200A has a line buffer enabling data read-out during integration. An electronic shutter is provided. In addition, the sensor has a differentia! analog output to improve noise immunity for long distance signal transmission. This feature also removes the need for an analog reference input. Operation is simplified by internal control logic that requires only two serial-input pulses and a clock. External override of the internal control logic is available for additional flexibility.

   

 

FRAMOS

Electronic Vertriebs GmbH

Dauthendeystrasse 2

http://www.framos.de

CMOS Line Scan Sensor PDI-CIS1200A

Precision Load Cells

 

The Force/Torque Division of PCB Piezotronics, Inc. (Depew, NY) announces a new series of high-accuracy, high-capacity, strain-gage load cells. The Series 1123 addresses load measurements to 150,000 pounds in applications such as rocket test stands, rocket motor thrust, airframe structures, satellite refueling, structural balance, and component life cycle testing. The units utilize a dual bridge design to provide redundant output channels for the ability to drive two readout or recording devices. Aircraft quality, premium steel construction imparts high stiffness, low deflection, and minimal extraneous load output characteristics. The robust design includes shrouded connectors to guard against accidental damage and the provided NIST traceable calibration verifies full-scale accuracy of better than 0.05%.

Precision Load Cell

 

PCB Piezotronics, Inc.,

E-mail: force@pcb.com

http://www.pcb.com

 

REFERENCE GUIDE

Op Amps for Everyone, Design Reference

Transparant

Texas Instrument's online design reference (18 chapters in PDF format), Op Amps for Everyone, helps simplify analog design processes. Now you can get one-click access to tutorials, real-world design examples and important design tips. Ideal for novice and expert analog designers, the online reference features diagrams, equations and examples. The Chapter 12 is devoted to the instrumentation: sensors to A/D converters.

 

Topics include:

 

Chapter 1 - The Op Amp's Place in the World

Chapter 2 - Review of Circuit Theory

Chapter 3 - Development of Ideal Op Amp Equations

Chapter 4 - Single-Supply Op Amp Design Techniques

Chapter 5 - Feedback and Stability Theory

Chapter 6 - Development of the Non-Ideal Op Amp Equations

Chapter 7 - Voltage-Feedback Op Amp Compensation

Chapter 8 - Current-Feedback Op Amp Analysis

Chapter 9 - Voltage and Current-Feedback Op Amp Comparison

Chapter 10 - Op Amp Noise Theory and Applications

Chapter 11 - Understanding Op Amp Parameters

Chapter 12 - Instrumentation: Sensors to A/D Converters

Chapter 13 - Wireless Communication: Signal Conditioning for IF Sampling

Chapter 14 - Interfacing D/A Converters to Loads

Chapter 15 - Sine Wave Oscillators

Chapter 16 - Active Filter Design Techniques

Chapter 17 - Circuit Board Layout Techniques

Chapter 18 - Designing Low-Voltage Op Amp Circuits

Appendix A - Single-Supply Circuit Collection Complete

 

Click <here> to download your free copy

 

 

 

 

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