Pressure transducer with piezoelectric crystal for harsh environment use

A pressure transducer comprising:

• a housing and a piezoelectric resonator in the housing, wherein
• the resonator is made of a piezoelectric crystal having Curie temperature greater than 1000° C. or having no Curie temperature up to its melting point greater than 1000° C., and
• the piezoelectric crystal has a piezoelectric constant more than two times greater than that of quartz,
• wherein:
• the housing is axisymmetric, the housing comprising a cylindrical body section and at least one end cap at one end of the body section;
• and
• the resonator is formed with a discoid element connected to the internal surface of the body section, the resonator having a generally H-shape in cross section.

A tool for pressure measurement comprising:

• a pressure transducer and at least one oscillator circuit coupled to the pressure transducer, wherein
• the pressure transducer comprising:
• a housing comprising a cylindrical body section and at least one end cap at one end of the body section;
• a piezoelectric resonator in the housing, wherein
• the resonator is made of a piezoelectric crystal having Curie temperature greater than 1000° C. and a piezoelectric constant more than two times greater than that of quartz, and
• the resonator is formed with an internal element extending in a plane parallel to the longitudinal direction of the body section, the internal element being connected to the internal surface of the body section.