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Using Acoustic Beamforming for Pass-By Noise Source Detection

This application note discusses a technique known as beamforming for determining noise location of passing vehicles. The technique has several challenges including simultaneous acquisition of a large sensor array, advanced signal processing and storage of extremely large data sets, and the environmental considerations required for operating outdoors on a test track. This application note recommends best practices for performing beamforming and walks through the complete system required from the test environment to the sensors to the math, analysis, and data storage with the goal of the reader being able to apply the technique.

Posted in: Test & Measurement, White Papers

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Implementation of Real-time Spectrum Analysis

The keys to real-time spectrum analysis are to provide parallel sampling and FFT calculations so the data acquisition continues while the FFT’s are performed, and to provide fast enough DSP processing of FFT algorithms to keep up with the sample rate at the input. This white paper discusses the technical implementation of the real-time process in the Rohde & Schwarz real-time analyzers, and the applications for use of this analysis capability in the troubleshooting and test of modern designs.

Posted in: Test & Measurement, White Papers

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Oscilloscope Fundamentals

The oscilloscope is arguably one of the most useful tools ever created for use by electronic engineers. In the more than five decades since the modern analog oscilloscope was created, hundreds of useful documents and thousands of articles have been written about what it is, how it works, how to use it, and application-specific examples of the “oscilloscope” in action. It is the purpose of this primer to instead describe digital oscilloscopes, which have for practical purposes replaced their analog predecessors in the vast majority of applications. Covered here is a short description of the oscilloscope’s origins, its transition from analog to digital, types of digital oscilloscopes and their major subsystems, key benchmark specifications, and measurements.

Posted in: Test & Measurement, White Papers

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Troubleshooting EMI in Embedded Designs

Today, engineers need reliable data fast, and to ensure compliance with regulations for electromagnetic compatibility in the most economical way, appropriate measures must be taken early in the design phase. This paper provides a brief introduction to embedded EMI troubleshooting challenges and how to use a digital oscilloscope to debug the two key culprits of EMI – switching power supplies and power amplifiers. The Rohde & Schwarz R&S®RTO series oscilloscope provides time correlated multi-domain analysis often required to troubleshoot the complex time and frequency domain embedded design challenges.

Posted in: Test & Measurement, White Papers

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Hybrid and Electric Vehicle Test System

SAKOR Technologies, Inc. (Okemos, MI) designed and installed a complete turnkey Hybrid and Electric Vehicle Test System for UQM Technologies, Inc. (Longmont, CO), a manufacturer of high-efficiency electric propulsion systems. UQM will use the system to test inverters and traction motors for use in hybrid and electric vehicles for the automotive, commercial truck, bus, and military markets.

Posted in: Batteries, Power Supplies, Electronics, Power Management, Energy Efficiency, Test & Measurement, Transportation, Products

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Beat-to-Beat Blood Pressure Monitor

This invention is applicable to all segments of the blood pressure monitoring market, including ambulatory, home-based, and high-acuity monitoring. This device provides non-invasive beat-to-beat blood pressure measurements and can be worn over the upper arm for prolonged durations. Phase and waveform analyses are performed on filtered proximal and distal photoplethysmographic (PPG) waveforms obtained from the brachial artery. The phase analysis is used primarily for the computation of the mean arterial pressure, while the waveform analysis is used primarily to obtain the pulse pressure. Realtime compliance estimate is used to refine both the mean arterial and pulse pressures to provide the beat-to-beat blood pressure measurement.

Posted in: Bio-Medical, Physical Sciences, Test & Measurement, Medical, Patient Monitoring, Measuring Instruments, Monitoring, Briefs

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Magnetic Testing Technique Helps Ensure Reliability of PV Cells

Making use of the force generated by magnetic repulsion, Georgia Tech researchers have developed a new technique for measuring the adhesion strength between thin films of materials used in microelectronic devices, photovoltaic cells, and microelectromechanical systems (MEMS).

Posted in: Solar Power, Renewable Energy, Test & Measurement, Semiconductors & ICs, MEMs, News

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