Study on Optical Fiber Gas-Holdup Meter Signal Denoising Using Improved Threshold Wavelet Transform

The optical fiber probe gas-holdup meter is a new logging tool, which can be used to measure the of oil-gas-water three-phase flow during production logging. In this paper, wavelet transform denoise measured signal probe. For threshold de-noising method, existing hard and soft functions have certain defects. So we propose denoising method with an improved function, use signal-to-noise ratio, root mean square error, smoothness, correlation coefficient are as evaluation indexes effect. function between function. It has advantages both functions, effectively overcome discontinuity constant deviation improves efficiency signal. proposed applied synthetic data real respectively. Compared traditional experiment results show that feasible. And it effective in denoising, improving reducing increasing coefficient. preserves well original features signal, provides reference for processing dynamic monitoring analysis subsequent oil-well downhole development.