Micro-Epsilon UK Ltd. - PRODUCT NEWS

Draw wire sensors position mechanical moving parts on X-ray machines

A manufacturer of digital X-ray machines is using high precision draw wire (string pot) sensors from Micro-Epsilon to accurately position mechanical moving parts of the X-ray machine and table.

X-ray machines must provide high quality images in a variety of different positions. Previously, an X-ray cassette with film had to be manually aligned with the X-ray tubes, but today, this is performed digitally and is a fully automatic process.

Modern equipment functions with a camera that digitalises the recordings directly. This saves time and development costs. The camera must be exactly aligned with the X-ray tubes so that high-resolution recordings are produced for digital equipment. The cameras, the X-ray tubes, the table and the wall stands can be moved on several axes, providing as much flexibility as possible.

Roesys GmbH, a developer and manufacturer of digital X-ray systems is using draw-wire sensors from Micro-Epsilon's WPS-MK series to position the mechanical moving parts on its machines.

The synchronisation controller in the X-ray machine uses the displacement information from the draw-wire sensors to enable the camera and X-ray tubes to move parallel to one another. This parallel running means that the best possible focussing of the X-ray tubes for the camera is achieved. A total of five sensors are located in the wall stands, in the X-ray table and in the vertical traversing unit for the X-ray table.

Measuring ranges of the sensors are from 500mm up to 1,700mm, with linearity of 0.25% of the measurement value.

Due to ease of installation, the customer can use the sensor without having to modify existing systems. It is critical that optimum focussing of the X-ray image is achieved using intelligent software and precise displacement measurement of the draw-wire sensors. This results in reduced radiation exposure for the patient and perfect images for more extensive diagnoses.

Micro-Epsilon's wireSENSOR range of draw wire sensors uses three main measurement methods: a multi-turn potentiometer, an incremental encoder or an absolute encoder. One of these devices is mounted onto the drum axle, converting the rotary motion of the drum into a signal that can be evaluated. The measured displacement can be output as an analogue current, voltage or potentiometric signal. For a digital output, there is a choice of HTL or TTL, with interfaces for most of the common fieldbus systems, including CANopen, SSI and Profibus.

Micro-Epsilon (www.micro-epsilon.co.uk) is a major global manufacturer of sensors, headquartered in Germany. The company’s range of displacement sensors measure everything from to distance, position, vibration, dimensions and thickness, using both contact and non-contact measurement techniques. These techniques include 1D, 2D and even 3D laser-optical sensors and systems, eddy-current, capacitive, LVDT & inductive, potentiometric and draw-wire principles. Additionally Micro Epsilon has developed its own range of non-contact infrared temperature sensors that can measure virtually any target temperature from -40 to +3,300°C.

With more than 35 years’ experience in the industry, Micro-Epsilon isn’t just a sensor manufacturer. The company is highly innovative and understands the importance of providing complete solutions and support services for its customers. The firm is renowned for its expertise in consulting, development and application of industrial sensors to complex, customer-specific solutions for measurement, inspection and automation. The focus is on selling technical advantage to its customers.

For sales and technical information contact:-

Chris Jones
Micro-Epsilon UK Ltd.
Telephone: +44(0)151 355 6070
Fax: +44(0)151 355 6075

December 2011

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