Fibre optic Triaxial accelerometer interconnection in harsh with integral electronics environments Endevco (UK), a subsidiary of than 2.5 grams; wide bandwidth, Allied-Signal Aerospace Com flat to 20kHz; high resonant pany, has introduced a new light frequency of 80kHz; low output The use of Fibre Optic data links Amphenol addressed this prob weight, triaxial accelerometer with impedance, less than 100 ohms; has many advantages over copper lem by developing the fibre optic integral electronics. electrical isolation to prevent wire — including intrinsic safety, active plug. The model 7253A is designed ground loop; versatile mounting, high band width, security, weight, The connector between the to measure vibration in all three screw or adhesive; and solder space saving and immunity to equipment and the fibre optic orthogonal axes in small structures terminals enabling field replace EMI, EMP, lightning strike and cable is a conventional three without imposing any mass-load able cable. crosstalk. contact military standard circular ing effect. Paul Marchant, market Endevco is a leading designer electrical connector (plug and However, there are also tradi ing director of Endevco (UK) and manufacturer of dynamic receptacle) available in aluminium tional disadvantages to using fibre commented, "Light weight and instrumentation for pressure, optic interconnection components or Navy standard aluminium miniature size are the primary vibration and shock measurements, in harsh environments: Connectors bronze. The conversion to light design objectives of this device. solving dynamic measurement and fibre cables are non-rugged- (TX) or from light (RX) is The accelerometer also has rela problems in aerospace. achieved by positioning the TX or ised; fibre iks not easily terminated tively high output sensitivity RX in the back shell of the by untrained personnel; and the (10mV/g) for its size." Edevco UK Ltd., Melbourn, electrical connector free plug. fibre interface is prone to con Other high performance charac Royston, Herts. SG8 6AQ. Tel: tamination when connectors are The user perceives the connec teristics include: weight of less 0763 261311. unmated, resulting in a loss of tion between the equipment and transmitted light when mated. the fibre optic cable to be a Amphenol, which has been standard electrical connector supplying a full range of fibre which can be unmated without optic connectors and cable assem any concerns regarding contam Next-day delivery from ination. blies to commercial customers since fibre optics became an A range of TX RX devices are Engelhard accepted technology, has over available to customer application come the harsh environment prob requirements. nised as the most reliable sensing lems. At present, the single way Engelhard has introduced a next- elements for high temperature In recent years, for example, active plug is available. However, day delivery service for its range measurement applications. military customers have demanded a large potential has been identified of thermocouple wires, which "They have outstanding prop connectors and cable that will for a duplex version, i.e. a TX and offers customers considerable cost erties — such as high melting survive battlefields, weatherdeck RX in the same connector termina savings. points, accuracy over a wide and airborne environments. tion into a duplex fibre optic local It is available immediately and temperature range, resistance to Accordingly, Amphenol began area network. Development of guarantees that orders placed by 2 corrosion and stability in calibra the development of ruggedised this product, which employs a 6 p.m. will be delivered the following tion." fibre optic connectors in 1987 on pin electrical connector, is well day. The 'next-day' items Engelhard the Eurofighter project; this was advanced. Production product The new service means that now holds in stock are standard followed by army vehicle/battle should be available towards mid customers will no longer need to diameter Type R, Pt13 Rh vs Pt, field and navy weatherdeck re 1992. tie up money in holding precious thermocouple wires of between quirements. Development fell Amphenol's philosophy in this metal stocks and will have the 0.15mm and 0.5mm diameter, mainly into two areas: area of ruggedised fibre optic peace of mind of knowing that the although other types and sizes can 1. The MFM interconnection is a system metal price will be fixed at the also be supplied. A conventional ceramic ferrule approach. Every component of time of order. An expert on sensing elements connector, packaged to survive in the cable harness has to meet the Engelhard has been supplying is also on hand at the Chessington harsh environments. Testing in customers' performance and envir precious metal thermocouple wires site to give free advice on which cludes vibration, shock, environ onmental requirements. Working to the glass, steel, instrumentation type of wire should be used for mental sealing, elevated tempera with manufacturers of active and aerospace industries for more particular applications. tures and repeatable low insertion device and rugged fibre optic than 50 years and is one of the To obtain further information loss. cable, Amphenol can offer fibre world's most experienced com on the new, fast service, and to get 2. The fibre optic active plug optic interconnection systems in panies in the business of tempera a free brochure detailing Engel Any conventional ceramic ferrule component form or manufactured ture sensing. hard's range of precious metal and tested to customers require fibre optic connector, including Trevor Beddenham, sales repre wire s for high-temperature ments. the MFM, is prone to contamina sentative at Engelhard's plant at thermocouples, contact Ernie tion of the ceramic fibre face when Chessington, Surrey, where the Sparrowhawk at: Engelhard Sales unmated with the resultant partial Amphenol Ltd., Thanet Way, stocks are now being held, ex Limited, Davis Road, Chessington, or total loss of transmitted light plained: "Precious metals and Whitstable, Kent CT5 3JF. Tel: Surrey KT9 1TD. Tel: 081 397 when mated. their alloys have long been recog 0227 773200. 5292. Fax: 081 397 7230. AIRCRAFT ENGINEERING — April 1992 31
Aircraft Engineering and Aerospace Technology – Emerald Publishing
Published: Apr 1, 1992
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