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opment of accelerometers that could be used at even higher temperatures, like those found in nuclear power plants. The required temperature characteris-tics were in the range of up to 300°C. At this level, simply improving the prop-erties of the ceramic is not sufcient to meet the performance requirements. The problem was solved by an idea drawn from technological expertise accumulated over the years. Rather than using a single ceramic material, the product involved a combination of several different types of ceramic ma-terials, which was a breakthrough idea and solved the high temperature perfor-mance requirement. Together with the know-how for maintaining reliability even under extreme conditions, this re-sulted in the PV-63 series, unrivaled by products from other manufacturers.The environment inside a nuclear power plant is unique and requires not just custom designed piezoelectric ele-ments, but custom designed connectors and cables. During development, tests are performed to check their resistance against radiation, including γ-ray and other factors, before these products are cleared for shipment to manufacturers of nuclear power plants.Always Setting Clear Goalsand Pushing Forwardin Development“I think all of the product groups deve-loped by our company were developed by rst clearly visualizing their ideal form, making the most of our techno-logical expertise, then moving straight toward the goal,” says Dai Adachi on their effective approach to product development.The compact accelerometer PV-90B, currently the company’s best-selling product, meets the need for compact instruments. Forty years have passed since it was rst introduced to the mar-ket. Manufacturers of automobiles, home electronics, and component devel-opment continue to rely on it. The PV-91C, another popular product among the compact models, features an inge-nious design and an internalized IC. It’s being capable of measurements up to 170°C.“What our customers need isn’t the vibration pickup itself, but accurate measurement of vibration—no more, no less,” Shimomura says in closing. “Customer needs like this will always be the starting point of product develop-ment at Rion.”Kazuhiro ShimomuraComponent Technology Development De­partment, Technical Development Center. Mr. Shimomura's career has focused on the development of vibration meters. His knowledge, experience, and skills in the eld of impact measurement and acceler­ometers are unmatched at Rion. He has been instrumental in publishing numerous research papers on the analysis of faulty vibration based on three­dimensional space information, the measurement of two­dimensional space vibrations using a single axis sensor, and similar topics.Dai AdachiS&V Sensor Development Section, Compo­nent Technology Development Depart­ment, Technical Development Center. Like Kazuhiro Shimomura, Mr. Adachi has dedicated himself to the develop­ment of vibration meters and technologi­cal innovation in the eld of acceleration pickups. As a member of the Subcommittee on Environmental Vibration Measure­ment and Analysis of the Architectural Institute of Japan, he’s especially enthusi­astic about establishing joint activities outside Rion and continues to take part in a wide range of activities to do with vibration measurement.9[PV-95] The PV­95 is a standard, general purpose shear­type accel­erometer featuring a titanium casing and relatively compact dimensions. It’s rated for use at temperatures from −50°C to 160°C.[PV-90B]The PV­90B is a compact, lightweight, shear­type accelerom­eter suitable for measurements of lightweight structures and mode analysis. Featuring a titanium casing, it’s rated for use at temperatures from −50°C to 160°C. Calibration of accelerometersAccelerometers are extremely stable sen­sors. Their characteristics change a mere 1% over a decade. Nevertheless, if used fre­quently, they require periodic calibration to ensure the reliability of the data obtained.

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