FEATURE SENSORS & SENSING SYSTEMS
PUTTING ON A SHOW A
The Advanced Engineering Show, held at the NEC, Birmingham, on the 11th-12th November, saw sensor manufacturer, PCB Piezotronics, showcase its range of industrial sensors, accelerometers and microphones
new range of strain gauge dual bridge load cells for aircraft structural, lifetime and
fatigue testing, were on show, along with new microphone products including the 377B26 probe microphone designed for R&D engineers needing to measure sound pressure in confined areas. There was also high-g shock MEMS accelerometers capable of measuring long duration transient motion as well as responding to and surviving extremely fast rise times typical of applications such as down-hole oil exploration, pyroshock and crash/impact environments. PCB’s new series 1400 strain gauge dual
bridge, fatigue rated load cells are designed specifically for iron bird and airframe structural, lifetime and fatigue testing applications on wings, fuselage, landing gear and other airframe components. Features include dual outputs to provide sensor redundancy and the ability to provide control feedback from one bridge while the other is used for data acquisition. The new load cells are available in multiple ranges, include thermal compensation and are supplied complete with load bases as standard. The load cell including load base, comes complete with A2LA accredited calibration to ISO 17025 in both tension and compression modes. An additional feature -
moment compensation - helps to maintain accurate output from the sensor in the presence of eccentric loading and side loads that are often experienced during highly repetitive load testing cycles. A single shunt calibration resistor is provided with each load cell to simplify calibration at the test site. PCB’s latest probe microphone - model 377B26 - is designed for R&D engineers who need to measure sound pressure in confined areas. The probe tip diameter is extremely small measuring 1.3mm which enables white goods, telephone, headphone, loudspeaker and musical instrument manufacturers to make measurements in small, confined and difficult to access areas that cannot be accessed using traditional microphones, which are typically larger. The small size of the probe tip also allows near field measurements with minimal disturbance of the sound field. This enables more accurate test results. The probe microphone comprises four
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components - pre-polarised microphone, pre- amplifier, housing and several probe tips of
different lengths. The components work together to provide a maximum operating temperature of 800°C - greater than traditional test and measurement microphones. The high temperature capability and small diameter make it well suited for HVAC manufacturers and test engineers performing leak detection tests at elevated temperatures. Other microphones on show were the 378B02, 377B02 and 130E20 models. Designed for product testing in anechoic chambers or environmental testing, model 378B02 is a half- inch pre-polarised free-field condenser microphone and ICP preamplifier. Model 377B02 is a half-inch free-field, polarised condenser microphone cartridge that can be paired with any IEC compliant preamplifier. Model 130E20 is a quarter inch ICP array microphone with integral preamplifier designed for use in various applications including acoustic holography, beam forming and general purpose audible range test applications. MEMS high amplitude shock accelerometers were also on show including series 3501 and 3503, both available with ranges of 20,000 and 60,000g. These miniature DC response acceleration sensors are capable of measuring long duration transient motion as well as responding to and surviving extremely fast rise times typical of a high-g shock event. Both packaged and OEM configurations are available to fulfil a variety of
installation requirements. The lightly air damped acceleration sensing
element - micromachined from silicon - is manufactured with the latest advances in etching techniques using the latest equipment. This tiny element, measuring just 2.5 x 1.7 x 0.9mm, incorporates a seismic mass, protective over range stops and a full active piezoresistive Wheatstone bridge. The 3501/3 series MEMS sensors are intended
to fulfil the most demanding aerospace, industrial and commercial application requirements. Applications include consumer electronics drop testing, down-hole oil exploration, tool manufacturers, pyroshock and crash/impact environments.
PCB Piezotronics
www.pcb.com T: 01462 429 710
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