The earth quake results from the sudden release of accumulated energy for years at the earth 地震是源自于地球多年來(lái)所積累的能量短暫而突然的釋放。
For solving the problem , we use the method of tract before detect ( tbd ) , and preprocess before using tbd to accumulate energy of multiple frames 為此,本文應(yīng)用了tbd檢測(cè)的方法,而且,在多幀積累之前,首先進(jìn)行了圖像預(yù)處理以提高信噪比,抑制背景。
The assisting mechanism of hammer in dredge haul is to accumulate energy with wire pull , draw inner pole firstly , release by pin framework , acceleratc core piece , strike hammer shell , produce great instantaneous wallop , drag dredge to break op stone immediately , restore with reposition spring , and work again finally 該機(jī)構(gòu)在拖網(wǎng)取樣時(shí)利用鋼纜拉力蓄積能量拉動(dòng)內(nèi)部拉桿,并通過(guò)銷軸機(jī)構(gòu)釋放能量加速?zèng)_擊芯塊,撞擊殼體產(chǎn)生巨大的瞬時(shí)沖擊力,拽動(dòng)拖網(wǎng)破碎巖石,然后使用復(fù)位彈簧使機(jī)構(gòu)復(fù)位,重新工作。
The principle of vibrator is to introduce scattered energy to underground in a comparatively long time , and collect the energy through correlation and compress it into a narrow pulse . the portable high - frequency vibrator system , developed by key lab of geo - exploration and instrumentation ( jilin univ ) , ministry of education , generates chirp signal and accumulates energy through a long - time bestiring . according to the characteristics of vibrator , the seismic recorder that operates on - line with vibrator must have these functions as follow : first , it must have the ability of recording a great quantity of data . second , it must have assistant channels to sample reference signal . third , it must have the function of data correlation in real - time 可控震源利用可控的小能量、長(zhǎng)時(shí)間激發(fā)波來(lái)實(shí)現(xiàn)沖擊震源瞬時(shí)產(chǎn)生的大能量激發(fā)波。在利用可控震源進(jìn)行地震勘探時(shí),要求地震儀長(zhǎng)時(shí)間記錄地震信號(hào),這對(duì)地震儀的采樣長(zhǎng)度提出了很高的要求。受存儲(chǔ)量和數(shù)據(jù)傳輸速度的限制,絕大多數(shù)地震儀很難對(duì)如此大的數(shù)據(jù)量進(jìn)行記錄,同時(shí),可控震源要求地震儀有兩個(gè)輔助通道并且具有數(shù)據(jù)相關(guān)功能,目前國(guó)內(nèi)還沒(méi)有出現(xiàn)滿足要求的地震儀產(chǎn)品。