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February 2001
VOL. 18 NO.2 Table of Contents |
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EDITORIAL
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What's On Your Mind?
Barbara G. Goode
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DA SYSTEMS AND COVER STORY
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Monitoring, Analyzing, and Improving the Indoor Scene with Environmental Data Loggers Data loggers are excellent tools for gathering information about the performance of various building systems. Here are two case studies in which analyses of light bulb use and ambient CO2 levels led to verifiable energy and cost-saving measures.
Hugh J. Flye and Gregg M. Daly
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FEATURES
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Using Acoustic Microimaging to Locate Flaws and Other Anomalies The homogeneous character of advanced ceramics requires an inspection technique based on a special property of ultrasonic pulses—Rayleigh waves.
Tom Adams
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Building a Tiny Accelerometer to Detect Very Small Signals A new manufacturing process that permits integration of sensor and signal conditioning electronics on a single IC die can help accelerometers detect even smaller signals.
Harvey Weinberg
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Imaging Sensors That Capture Your Attention Ready to revolutionize the market, CMOS technology enables you to add imaging capabilities to products you never thought possible.
Helen Titus
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A Selection Guide to Hydrophobic Microporous Membranes Some types of sensors require a flow-through of air or some other gas for their operation, but must at the same time be shielded against the intrusion of particulates and liquids. Here, in tabular form, is most of what you need to know about choosing the right membrane to protect your sensor.
Patrick Connor and Kawsar Ahmed
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Eliminating False Triggering with the DCDD Pressure Switch A unique pressure switch based on a double-contact, double-diaphragm configuration virtually eliminates false actuations due to shock or vibration.
Brent Sowers
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Accurate Speed Sensing on Harley-Davidson Racing Bikes An inductive sensor enhances the performance of the digital speedometer on the VR 1000 Harley-Davidson racing bike.
Stephen Petronio
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Enhancing Overpressure Tolerance with Bellows How do you revamp your pressure transducer to withstand peaks of 35 X the rated range, at no added cost? Try an electrodeposited nickel bellows.
Paul Hazlitt
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New, Integrated Interface ASICs for Capacitive Measurement Technology Introducing the CAN 404 and CAV 414 analog ASICs, designed to measure small swings in capacitance across a wide range of values.
Jörg Stecker
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DEPARTMENTS
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Business Sense
Research and Developments
Web Picks
Literature Showcase
Wish List
Advertiser Index
ABOUT THE COVER
Boston’s Museum of Fine Arts has used data loggers for several years in its exhibits and storage areas, and when transporting environmentally sensitive artifacts. Data loggers—small, battery-operated devices that can be remotely placed and easily hidden—gather information at selected intervals, to be later downloaded to a computer for analysis. Temperature, relative humidity, and light intensity are currently being recorded throughout many MFA exhibits, including the Egyptian Funerary Arts Gallery and the Koch Gallery, a bit of which can be seen in this month's cover story. The Egyptian mummy mask on this month’s cover (and in the article) is constructed of cartonnage, a material similar to papier mâché, made of layers of linen and coated with plaster. Its rich gilding signifies the status of its owner and also evokes the golden flesh of the gods, with whom the deceased hoped to be united. (Photos by Tom Mignone, Onset Computer Corp., by permission of the Museum of Fine Arts, Boston.)
