Pressure sensing apparatus and engine analyzing apparatus

Details Pressure sensing apparatus and engine analyzing apparatus Pressure sensing apparatus and engine analyzing apparatus

1980-03-21

1981-03-24

Myracle, Jerry W.

Measuring and testing

Internal combustion engine or related engine system or...

Compression

73727, G01F 900

Patent

active

042572606

ABSTRACT:
There is disclosed apparatus for sensing cyclically varying pressure in a pipe, particularly but not exclusively for sensing pressure in fuel lines. The apparatus depends on resilient elements which bend symmetrically on pressure change, and transducers producing equal and opposite signals depending on the bending strain. In the first form of apparatus, a ring surrounds the pipe and bears upon it through screws at four spaced points. The ring is on two portions, to be assembled around the pipe. When so assembled, the ring portions bend as beams when the pipe dilates. Symmetrical piezoelectric crystals detect this bending. The second form of apparatus described comprises a pair of similar sensing members in the form of blocks each shaped to embrace a pipe over an arc and to make line contact with the pipe at two spaced locations; the blocks are removably clamped about the pipe. A transducer on each block provides electrical signals in dependence on bending strain in the block due to periodic dilatation of the pipe. The third form of apparatus also employs a pair of similar sensing members each shaped to embrace a pipe over an arc and to make line contact with the pipe at two spaced locations are removably clamped about the pipe. The third form of sensing apparatus also uses transducers one on each member, to provide equal and opposite electrical signals in dependence on bending strain in the members due to period dilation of the pipe.

REFERENCES:
patent: 3866473 (1975-02-01), Teitelbaum et al.
patent: 3942049 (1976-03-01), Hyanora et al.
patent: 4090404 (1978-05-01), Dupont et al.

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