絕對重力儀時(shí)間測量技術(shù)研究
本文關(guān)鍵詞: TDC502 絕對重力儀 時(shí)間測量 FPGA 出處:《中國地震局地震研究所》2013年碩士論文 論文類型:學(xué)位論文
【摘要】:地球重力場反映了地球密度分布、地球自轉(zhuǎn)運(yùn)動(dòng)等物理信息,,是地球科學(xué)的基礎(chǔ)信息資源。絕對重力儀是高精度地獲取地球重力場信息的重要儀器之一。目前絕對重力測量系統(tǒng)主要通過自由落體獲得相位差,利用激光干涉原理獲得下落時(shí)間和位移量的觀測量,從而計(jì)算出重力加速度g。隨著激光、真空技術(shù)、電子技術(shù)等新興技術(shù)的日益成熟、精密機(jī)械工藝的提高,相關(guān)測量方法和誤差原理的優(yōu)化,使絕對重力儀的精度不斷提高,新一代絕對重力儀FG5精度達(dá)到1×10~(-8)ms~(-2)。 在絕對重力測量系統(tǒng)中,影響精度的因素主要包括激光頻率穩(wěn)定性、落體艙真空度、重力梯度測量、干涉條紋時(shí)間周期的測量精度。而高精度的時(shí)間測量技術(shù)在科研、國防以及工業(yè)領(lǐng)域有著廣泛的應(yīng)用,隨著信息化社會(huì)的高速發(fā)展,有越來越多的領(lǐng)域需要應(yīng)用到高精度時(shí)間測量技術(shù),國外在高精度時(shí)間測量方面已經(jīng)走在前列,我國的高精度時(shí)間測量技術(shù)還在發(fā)展階段,因此對于這方面的研究是有必要的。 本文闡述絕對重力儀對自由落體下落距離和相對應(yīng)的時(shí)間測量的原理和方法。利用高精度時(shí)間測量芯片TDC502提高絕對重力儀的時(shí)間測量精度,并結(jié)合FPGA的大規(guī)模數(shù)字集成設(shè)計(jì),從而提高重力儀系統(tǒng)的測量精度。
[Abstract]:The gravity field of the earth reflects the physical information such as the density distribution of the earth, the movement of the earth's rotation, etc. The absolute gravimeter is one of the important instruments to obtain the information of the earth's gravity field with high accuracy. At present, the absolute gravity measurement system obtains the phase difference mainly through the free falling body. The observation of falling time and displacement is obtained by using the principle of laser interference, and the gravity acceleration g is calculated. With the development of new technologies such as laser, vacuum technology and electronic technology, the precision mechanical technology is improved. The accuracy of the absolute gravimeter is improved by the optimization of the correlation measurement method and the error principle. The FG5 accuracy of the new generation absolute gravimeter is 1 脳 10 ~ (-8) Ms ~ (-1). In the absolute gravity measurement system, the main factors affecting the accuracy include laser frequency stability, falling chamber vacuum, gravity gradient measurement, interference fringes time period measurement accuracy, and high precision time measurement technology in scientific research. With the rapid development of information society, more and more fields need to be applied to high-precision time measurement technology. Foreign countries have been in the forefront of high-precision time measurement. The high-precision time measurement technology in China is still in the developing stage, so it is necessary to study this aspect. In this paper, the principle and method of absolute gravimeter for measuring the falling distance of free falling body and the corresponding time are described. The time measurement accuracy of absolute gravimeter is improved by using high precision time measurement chip TDC502, and the large scale digital integration design of FPGA is combined with this method. In order to improve the measuring accuracy of gravimeter system.
【學(xué)位授予單位】:中國地震局地震研究所
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2013
【分類號(hào)】:P223.1
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