now and is being fine tuned to become market ready.
PRODUCT INNOVATION DJB Instruments is no stranger to innovation and already has a number of products in its portfolio with unique technology and capabilities. The most recent products to be announced by the
company are the tapped base monoaxial and triaxial miniature accelerometers, which take the company’s established unique Konic Shear design and adds new mounting options for improved end use flexibility. The conical geometry of the piezoelectric ceramic
element of the accelerometer removes errors based on off-axis force vectors. According to DJB Instruments, the radial design of the Konic Shear element provides unrivalled performance in the removal of cross-axis errors in addition to near complete isolation from base strain errors. Impressive in itself, this technology goes a step
further by having the ability to be shrunk into some of the tiniest accelerometers on the market. According to James Wren, DJB’s sales and
marketing manager, it isn’t just the ceramic geometry and the size of the accelerometers that characterise the company’s products as unique in the market but also their ability to withstand high temperatures. “The temperature at which the piezoelectric effect
KEEPING IT IN CHECK
In DJB Instruments’ calibration laboratory, all accelerometers are checked and certified before shipment. The facility is also used for providing a calibration service for customers. As an accelerometer
ages, parameters can drift and it’s important to re-calibrate them at least annually. Calibration can be of the sensor itself or of associated signal processing equipment. Both charge and
IEPE accelerometers can be handled and the process includes checks for cross-axis errors, which occur due to the effects of vibration inputs that are perpendicular to the measurement axis.
breaks down is usually around 200C but we produce some accelerometers that can withstand temperatures as high as 900C,” he says. Raising the Curie temperature at which the piezoelectric properties of the ceramic break down is a subject of constant research and development at DJB Instruments. For high temperature applications, cooled accelerometers are also available.
EXPANDING THE KNOWLEDGE BASE With technology trends towards miniaturisation, high temperature ceramics and new applications, there’s a corresponding need to keep vibration and test engineers up to date. In this respect, DJB takes a refreshing approach towards training, focusing on what Ovenden refers to as the use of “real sensors in the real world by real engineers”. The company’s pragmatic approach to training
removes the marketing and product pitches from the schedule and focuses on providing valuable insight into sensor technology and what benefits the latest trends can bring to the tasks faced by engineers. Aimed at vibration and NVH engineers as well as
product designers, the DJB programme of training events examines the whole vibration measurement process from the accelerometer itself through to the data acquisition and signal processing phases. In addition to its own series of events, this year
❱❱ In-house laboratory can offer calibration services in controlled ambient conditions or extreme environments
DJB has joined up with the Sensors & Instrumentation event to deliver CPD accredited training there, including application insight using the experience of DJB customers, who will be presenting their case studies. T&TH
March 2019 /// Testing & Test Houses /// 23
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