Sensors/Data Acquisition

Novel Method to Collect Saliva for Cortisol and DHEA Measurement

This method is noninvasive, rapid, inexpensive, and does not require trained medical personnel, and samples can be stored at room temperature for at least six months. Lyndon B. Johnson Space Center, Houston, Texas Saliva is an easily accessible body fluid containing important biological markers of physiological regulation in the body. The ability to use saliva to monitor the health and disease state of an individual is a highly desirable goal for health promotion and healthcare research. Saliva can reflect tissue levels of some natural substances and a large variety of molecules introduced for therapeutic use, emotional status, hormonal status, immunological status, neurological effects, and nutritional and metabolic status. A major drawback of using saliva as a diagnostic fluid has been that analytes (substances undergoing analysis) are generally present in lower amounts in saliva than in blood.

Posted in: Briefs, Data Acquisition

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Cryogenic Propellant Feed System Analytical Tool

This parametric tool rapidly predicts heat leak into cryogenic propellant distribution lines. Lyndon B. Johnson Space Center, Houston, Texas The Propellant Feed System Analytical Tool (PFSAT) predicts heat leak based on insulation type, installation technique, line supports, penetrations, and instrumentation. It also determines the optimum orifice diameter for an optional thermodynamic vent system (TVS) to counteract heat leak into the feed line, and ensures that the temperature constraints at the end of the feed line are met. PFSAT was developed primarily using Fortran 90 code because of its computational speed and its ability to access directly real fluid property subroutines in the Reference Fluid Thermodynamic and Transport Prop erties (REFPROP) database developed by NIST.

Posted in: Briefs, Data Acquisition

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High-Performance MEMS IMU Solutions for Demanding Applications

For MEMS IMU applications where the inertial profile is complex and highly dynamic, there are a number of attributes to consider when evaluating capabilities. Evaluating these attributes early in the design cycle provides an advantage over chasing open-ended deliverables, like "as accurate as possible."

Posted in: White Papers, Electronics, Electronics & Computers, Data Acquisition, Sensors

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GSPS DACs Enable Ultra-Wide Bandwidth Applications

To meet the increasing capacity demand of mobile customers, the emerging E-band market requires wider bandwidth capabilities compared to traditional microwave backhaul wireless architectures. Due to increased capacity, 2-GHz E-band systems will be needed in the near future. This white paper covers the demands of current E-band point-to-point systems, and how Analog Devices’ high-speed digital-to-analog converters (DACs) provide the necessary bandwidth and sampling frequencies to support them.

Posted in: White Papers, Electronics, Electronics & Computers, Data Acquisition, Sensors

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Comparison of Interface Pressure Measurement Options

An increasingly competitive global marketplace means that design engineers must efficiently deliver a high quality product. Countless emerging technologies impact the design process and engineers must practice due diligence to ensure analysis tools meet their application’s requirements. This paper focuses specifically on technology for interface force and pressure measurement between two surfaces and includes a review of technology composition and data output. This paper will also examine capabilities driven by form factor, precision and environment that influence selection criteria of interface force and pressure sensors.

Posted in: White Papers, White Papers, Sensors

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Executive Perspectives: Data Acquisition & Sensing

GRANT MALOY SMITH President and CEO Dewetron, Inc. Wakefield, RI www.dewamerica.com In 40 years, data acquisition products have evolved from paper-based chart recorders and analog tape machines, to computer-based instruments. As a result, the relatively slow pace of improvements in performance that typified data recorders for nearly a century is now swept along on the fast-moving current of computer technology advances.

Posted in: Articles, Aerospace, Data Acquisition, Data Acquisition, Sensors

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Full RF Signal Chains from 0 Hz to 110 GHz

Analog Devices (ADI) has expanded its RF capabilities in the full signal chain, including companion products, in the full bandwidth from 0 Hz to 110 GHz.This white paper provides examples of the wider frequency spectrum covered by ADI, and explains that true DC is important. Off signal chain performance is also critical, and this paper shows how low-noise, high-stability control and power components are important to overall RF signal performance.

Posted in: White Papers, Electronics, Semiconductors & ICs, Data Acquisition, Sensors, Test & Measurement

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