| 摘要 |
A method, apparatus and system are disclosed for general use and for specifi c use when measuring pressure in well bores of hydrocarbon wells. A sensor, an interferometric optical pressure transducer (22), is disposed at the end if a fibre optic line (20) and illuminated by broadband light pulses from a pulse d broadband light source (10). Measuring equipment is provided, in the form of reflectors (31) and filters (34A, 34B, 34C) producing modulated and temporal ly separate light pulses (36, 38, 40, 36A, 38A, 40A) which are measured by a common photodiode (30), whose output is supplied to a microprocessor (56) driving a display (60) which indicates the pressure applied to the sensor (22). The transducer (22) is mathematically modelled by subjecting the transducer (22) to known pressures and noting the outputs. The measuring equipment (30-34) is mathematically modelled by applying test signals and noting the response for each signal. The mathematical models are combined (with individual device compensating factors). A microprocessor (56) output (C) is assumed. A mathematical model is used to calculate an estimation (B) of the actual output (A) from the sensor. (B) is compared with (A) and the valu e of (C) changed in the appropriate direction until the closest match is found between (A) and (B). The value of (C), at the closest approach between (A) a nd (B), is taken as the output to represent the pressure observed at the sensor (22). Different models and compensation factors can be used to allow interchange of different sensors and sensor types and measuring equipment an d measuring equipment types.
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