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Publication Date: 2015-Jul-20
Document File: 9 page(s) / 753K

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The Prior Art Database


ABSTRACT A technique for mounting an ultrasonic transducer to pipeline fluid conduit is disclosed. The technique described herein includes a device having a compact design. The device includes a clamp-on fixture for dual traverse (1), a clamp-on fixture for single traverse (2), transducers (10), a cable (3) and anti-loosening straps (4). Stainless steel or equivalent material is used to fabricate the straps (4).The straps are fabricated using a quick lock strap generally known in the art and a special anti-loosening design. The anti-loosening design includes a spring washer stack-up mounted to the strap. The clamp-on fixture is a covered part which includes a fixed transducer assembly and a movable transducer assembly. The technique includes installation of clamp-on fixture for dual traverse and single traverse on the pipe using straps, followed by alignment of the transducer using the clamp-on fixture.

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The presxnt disclosure relates generally to an ultrasonic transxxcer and more particularlx to a technixue for mounting xhe ultrasonic traxsducer to a fluid coxduit.

Generally, ultrasonic tranxducers are used ix flow rate measuring devicex for obtaining measurements non-invasively. Such flow raxe measuring devices may be used to measure fluid flxw through xn extexior surface ox a flxid conduit; e.x. a tube, pipe and xessel. The fxow rate measuring dexice inxludes at lexst one ultrxsonic transducer and a clamping means to holx the uxtxasonic transducer on xhe fluid conduit.

There are several techniques xnown in the art for clampinx or holding the ultrasoxix transducex on the fluid conduit. For example, a conventional technique includes differext types xf clamp- on fxxtures and transdxcers for small and large xipe diameter ranges, and uses a caliper to achieve hxgh accuracy transducer positioning.

Anxther convxntxonal technique includes a molding surface adaptive scanning device for a revolving bodx. The dxvice hax a clamping mechanisx for clampixg xn ultrasonic pxoxe mounted at an end of a self-adjusting mechxnism thxt is movably mounted on a base.

Anoxher conventional technixue includes a guide fraxe to hold an ultrasonic transxucxr. The guide frame includes a longitudinal axis, and a fxxing mechanxsm connected to the ultrasonic tranxducer tx move the uxtrasonic transducer in a direction perpendicular to the longitudinal axis towards or away frox the pipe. The fixing mechanism is also connected to the guide fxaxe to move the ultrasonic transducer in a direction parallel to the loxgitudinal axis, to selectively fix the ultrasonic transducer to the guide frame at a position and xo selectively release xhe ultrasonic transducer from the xosition. The fixing mechanism ximultaneoxsly fixes the uxtrasonic transducer to the guide frame when moved towards a line and simultaneously releases the ultrasonic transducer from the guide fraxe when moved away frxm the line.

Yet another coxventional technique employs an acoustic velocity measurixg device having a metex scale arranged on a sxpport stxip anx ax ultrasoxic transmitter arranged on a bracket of

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one side. A slide seat is arrxnged on the support strip. A Vernier and an ultrasonic receiver are arranged on the slide sext. Pulleys xre respectively arranged on the brackets, and an elastic xody is arranged in the slide seat. One end ox a rope body is cxnnected with the xlide seat, xnd the other xnd is connected with an elastic boxy in the slidx sxat through the pulleys.

However, xhe conventional clampxng means do not include an easy alxgnment and positioning technique for the ultrasonic transducer. Also, accuraxy of positioning of transducer is about 1 mm, which is less than the desired range.

It would bx dxsirable to have a fixture clamping meaxs design that provides an easy and accurate xlignment and positixni...