Pressure and temperature transducer

A transducer comprising:

• a) an elongate housing formed from double rotation cut crystal quartz, the exterior of which can be exposed to a pressure to be measured;
• b) an elongate plate-like resonator formed from double rotation cut crystal quartz capable of vibrating under an applied electric field located within the housing and connected across interior walls, wherein the resonator is formed in unitary construction with the housing and wherein long edges of the resonator are connected to the interior walls of the housing, and short edges of the resonator are free and extend across the interior of the housing in a substantially continuous curve;
• c) electrodes located on opposite faces of the resonator for applying an electric field which causes the resonator to vibrate;
• d) end caps formed from double rotation cut crystal quartz provided at each end of the housing to define a cavity therein.

A borehole tool comprising:

• a) a tool body which can be positioned in a borehole;
• b) sampling means for obtaining a fluid to be sampled;
• and
• c) a transducer, associated with the sampling means, for measuring fluid pressure, the transducer comprising:
• i) an elongate housing, the exterior of which can be exposed to a pressure to be measured;
• and
• ii) an elongate plate-like resonator capable of vibrating under an applied electric field located within the housing and connected across interior walls, wherein long edges of the resonator are connected to the interior walls of the housing, and short edges of the resonator are free and extend across the interior of the housing in a substantially continuous curve.