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



No. 8, August 2002



Table of Contents

(Click the title to download the full pages article)




IFSA celebrates its 3rd Anniversary


It is my great pleasure to congratulate all our 252 members from 50 countries as well as all our visitors with the 3rd International Frequency Sensor Association anniversary ! A lot of thanks for your great feedback and advices improving IFSA activity and its Sensors Web Portal. IFSA has been founded at 23 August 1999. Now it is well known professional association - a network of excellence. Its Sensors Web Portal has become the primary Internet resource devoted to sensors, transducers, MEMS and Data Acquisition areas with free monthly up-dated content which is now being used in 109 countries. Through the years, we have expanded our activities to include new services like Bookstore, Forums and Poll, Sensors Wish List, Sensors Technologies, etc. IFSA has completed its three-year of operation with a growing membership taken from many sectors of sensor industry and appropriate departments of the universities. Now it is solid platform to build the network of excellence and successful example of measurement infrastructure. Due to IFSA activities the smart sensors market has been increased up to 12-16 %. Stronger working partnerships between industry and academy will continue to be necessary to facilitate the growth of market.


Click <here> to download new full pages article about IFSA activities 'International Frequency Sensor Association (IFSA): Successful Example of Measurement Infrastructure', 2002


IFSA President's signature

Prof.,Dr. Nikolay V. Kirianaki,

IFSA President





SMT-160 Evaluation Board for Temperature Sensors with Duty-Cycle Output


Abstract: The SMT-160 evaluation board measures up to 8 SMT-160 temperature sensors using a single Input Capture unit of PIC16F873 single chip microcontroller. The sensors outputs are multiplexed at the input via a 4051 multiplexer. The board has an In Circuit Debugger connector to an ICD module, which can be used for programming and debugging. The software is written in C language and compiled with CCS PIC16xxx C-compiler. Timer1 module is configured at the highest possible system clock of 200 ns thus providing the finest possible resolution of the system. The USART is set up to work in asynchronous mode at 115200 Baud, 8 data bits, 1 stop bit, no parity error check in order to keep the transmission time as low as possible using a standard RS232 interface. With the help of the ICD the user can change that settings in order to evaluate the precision at lower timer frequencies, use different RS232 baud rates, etc. The program is detecting the presence of the selected sensor by waiting for positive and negative edges at the capture input. If there are no edges the sensor is missing. In that case the program can go immediately to measure the next one or wait for approximately 100 ms in order to keep the overall measurement time constant. The user can choose between these alternatives establishing a flag – sending “SPACE”/”Other character” using the RS232.


Ratcho Ivanov, 

Alexander Kerezov,

Ivan Lesichkov.


Technical University - Sofia, Bulgaria

E-mail: akerezov@tu-sofia.acad.bg

SMT-160 Evaluation board



Pressure Indicating Sensor Film


Pressurex - a sensor film that, by changing color, reveals stress distribution and magnitude between any two surfaces that come in contact. The intensity of the resultant color is quantifiable and enables you to determine precisely what the PSI is at any point on the contacting surfaces. Pressurex enables you to accurately assess PCB lamination roller planarity, reveal inconsistencies of contact between a heat sink and heat source, determine uniformity problems during thermocompression in the TAB process and measure contact forces in wafer and flip chip bonding and wafer polishing. The pressure-map images are shown in the photos below.



Bill Ebner,

Sensor Products Inc.

188 Rt. 10 Suite 307

East Hanover, NJ 07936-2108 USA

Tel.: 973.560.9092

Fax: 973.884.1699

E-mail: pressuresolution@earthlink.net

Printed Circuit Board





Intelligent Image Processing Sensor


Simatic VS 110 offers fast processing for high rates of inspection. Depending on the size of the parts, up to 25 analyses per second are achieved at transport speeds of up to 15 meters per minute. It works together with the most varied conveyor media such as oscillating conveyors, conveyor belts, transport systems for workpiece carriers, and gripper units such as pick-and-place systems or robots. For production changeovers and different parts types, up to fifteen good parts can be stored in the processing unit's non-volatile memory. So the conveyor unit can be used for different parts types. The features relevant for inspection purposes must be clearly discernible in the "silhouette" or contour of the inspection piece. The lighting unit and the sensor head are installed opposite each other and the conveyor is located between the two. The lighting unit projects the silhouette of the passing inspection piece onto the sensor. It uses infrared light so it is unaffected by changing daylight conditions. The inspection is started – or "triggered" – either automatically or externally using, for example, a light barrier. In the processing unit, the inspection piece is compared with the "good" part, and further actions are initiated depending on the result. The test results are output via digital interfaces. Pneumatic valves or small relays for ejecting or turning the inspection pieces can be controlled directly. This means that stand-alone solutions for simpler conveyor tasks can be implemented – without the need for an additional controller. The new Vision Sensor is not programmed. It learns its inspection task by being shown one or two different views of the part to be inspected This training takes place directly at the processing unit or remotely using a controller. All inputs are made using six operator elements on the processing unit, with the operator being prompted step-by-step via the integral LCD display panel. In addition to the new Simatic VS 110 Vision Sensor, Siemens offers the Simatic VS 710 image processing system, a smart camera with integral computer for the most varied image processing and measurement tasks.




Elske Meyer

Siemens AG

A&D AS SM5 Marketing-Services

E-mail: elske.meyer@siemens.com




Load Cells, Pressure Transducers and Accelerometers

with on Board Miniature Amplifiers


High level output signal is now available for all FGP Instrumentation’s sensors; Load cells, pressure transducers and accelerometers. With on board miniature amplifiers, FGP sensors offer high resolution and can be connected directly to conditioning cards for data acquisition. The sensors deliver a high level output signal with two possibilities:

  • A1: zero load = 4.5Vdc and ± Full Scale = ± 2 Vdc with 10-30 Vdc power supply;

  • A2: zero load =0 Vdc and ± Full Scale = ± 5 Vdc with ±15 Vdc power supply.

Issam Marire, FGP Instrumentation

ZI 24 Rue Des Dames BP 59

78344 Les Clayes Sous Bois

Tel: 01-30-79-65-40

Fax: 01-30-54-01-43

E-mail: scom@fgp.tm.fr

FGP Instrumentation sensors



Sensor for Measuring Interfacial Stresses in Real Time


Sensor Products introduces the ASET sensor for measuring interfacial stresses in real time. ASET is a thin profile magnetic resistive ink sensor element that reveals the surface area of contact and displacement of contact area levels. The operating principle of the ASET, which is a hybrid of a position and displacement sensor, is the ability to treat the entire sensing element as a linear potentiometer. Thus, the typical linear format design of the ASET sensor enables the entire surface contact area to be determined as well as sensing position along the line. Unlike resistive ink sensors and piezo sensors, the ASET does not require complicated and time-consuming calibration. It is a rugged, durable device that can withstand repeated applications of contact and impact under a wide range of environmental conditions.


Bill Ebner,

Sensor Products, Inc.

Tel: +1-973.884.1755 

E-mail: bebner@sensorprod.com

ASET sensor



Scanning-Laser Particle Detector for Multi-Point Monitoring

of Sub-Micron Contaminants


Syracuse, NY - 1 August 2002: The INFICON Stiletto Scanning-Laser Particle Detector, the first truly integrated particle monitoring system, is an advanced, in situ scanning-laser particle detector with enhanced sensitivity for multi-point monitoring of sub-micron contaminants in the vacuum chambers and pump-lines of semiconductor process equipment. A minimum detectable particle size of less than 0.25mm ensures that "killer defects" will be captured in real-time to minimize product loss. Its novel "auto-correlation" technique virtually eliminates false particle counts. An easy-to-use interface with the INFICON FabGuard Sensor Integration and Analysis System enables synchronized data collection and diagnostics for real-time advanced process control, wafer yield improvement, and increased tool productivity for the most demanding semiconductor applications.


Naomi Kissel-Johns


Tel: +315.434.1234

Fax: +315.434.1125

E-mail: Naomi.KisselJohns@inficon.com

Scanning-Laser Particle Detector





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