提高光栅数字地震检波器精度的方法研究
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摘要
在地震勘探系统中,随着数据记录系统动态范围的突破,地震检波器的动态范围已不能满足系统的要求,提高检波器的精度和动态范围变成地震勘探技术研究的关键。光栅数字地震检波器的研制成功,提高了检波器的精度和动态范围。通过对光栅传感器机理的深入分析,采用5细分专用芯片为核心的细分电路,成功实现了光栅脉冲信号的20倍细分技术。在采用100线计量光栅的情况下,使检波器分辨率达到0.000 5 mm,动态范围达到75 dB。并采用PIC单片机系统完成了振动信号的再现。该方法将有助于光栅数字地震检波器的性能完善,为实现高精度地震勘探技术奠定基础。
Along with break through dynamic range of the data recording system,the geophone can't satisfy demands of it,then enhancing precision and dynamic range of the geophone becomes key point of the seismic technique.The development of grating digital geophone enhances geophone precision and dynamic range.Through analyzing the grating sensor mechanism and adopting programmable voltage-regulator tube as core of the subdivision circuit,the grating pulsing signal with 20 times subdivision is realized.Geophone resolution ratio reaches to 0.0005mm and dynamic range reaches to 75dB by adopting 100 line/mm measuring grating.Meanwhile,the reappearance of the vibration signal is realized with PIC microcontroller.The method will conduce to perfect function of the grating digital geophone and establish foundation of high precision seismic technique.
Along with break through dynamic range of the data recording system,the geophone can't satisfy demands of it,then enhancing precision and dynamic range of the geophone becomes key point of the seismic technique.The development of grating digital geophone enhances geophone precision and dynamic range.Through analyzing the grating sensor mechanism and adopting programmable voltage-regulator tube as core of the subdivision circuit,the grating pulsing signal with 20 times subdivision is realized.Geophone resolution ratio reaches to 0.0005mm and dynamic range reaches to 75dB by adopting 100 line/mm measuring grating.Meanwhile,the reappearance of the vibration signal is realized with PIC microcontroller.The method will conduce to perfect function of the grating digital geophone and establish foundation of high precision seismic technique.
引文
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[2]李淑清,南忠良,陶知非,陈宁,陈晓艳.光栅微振动测试传感技术的研究[J].纳米技术与精密工程,2004,(6):157-162.
[3]李淑清,南忠良,李建良,陶知非.光栅谐振子检测地震波的理论和方法研究[J].仪器仪表学报,2004,(6):399-401.
[4]张善钟.计量光栅技术[M].北京:机械工业出版社,1985-12.
[5]陈先觉.一种实用的莫尔条纹高倍细分法[J].光学工程,1987,(5):39-44.
[6]李丰而,钟金刚.位移的莫尔条纹测量技术[J].实验技术与管理,2002,19(3).
[7]张国雄.测控电路[M].北京:机械工业出版社2004-02.
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