巡天光譜中拼接異常光譜的自動檢測和異常分級方法
發(fā)布時間:2018-11-25 09:52
【摘要】:拼接異常是光譜在紅藍(lán)兩端拼接區(qū)域表現(xiàn)出的光譜連續(xù)性差的一種現(xiàn)象。在LAMOST的光譜處理中,儀器的穩(wěn)定性、觀測條件以及獲得的響應(yīng)函數(shù)等問題都是造成拼接異常的原因。光譜拼接是否正常對于光譜發(fā)布等后續(xù)工作的質(zhì)量有重要影響。提出一種拼接異常光譜的自動檢測方法,有效地提高了工作效率。該研究可以為LAMOST數(shù)據(jù)提供一個自動的標(biāo)記,來評價拼接質(zhì)量,也可以為用戶提供一個使用數(shù)據(jù)時的選擇。該方法首先將待測光譜進(jìn)行流量歸一化、去除鈉線等預(yù)處理,并將其分為紅藍(lán)兩端;然后對紅藍(lán)兩端分別進(jìn)行擬合;最后對兩條擬合曲線,選取一系列等波長間隔的點,計算在這些點處的流量差值,得到所有流量差值的均值,標(biāo)準(zhǔn)差,并且計算兩條曲線積分面積的差值;基于上述統(tǒng)計量,提出了一個判斷光譜是否異常及其異常程度的評價函數(shù)。大量的實驗證明,該方法具有良好的拼接異常光譜檢測效果。
[Abstract]:Splicing anomaly is a phenomenon of spectral continuity in the regions of red and blue splicing. In the spectral processing of LAMOST, the stability of the instrument, the observation conditions and the response function obtained are all the causes of the abnormal splicing. Whether spectral splicing is normal or not has an important effect on the quality of subsequent work such as spectral distribution. An automatic detection method of splicing abnormal spectrum is presented, which improves the working efficiency effectively. This study can provide an automatic tag for LAMOST data to evaluate the splicing quality, and can also provide users with a choice when using the data. The method firstly normalizes the flow rate of the spectrum to be measured, removes the sodium line, and divides it into red and blue ends, and then fits the red and blue ends respectively. Finally, for two fitting curves, a series of points with equal wavelength spacing are selected, and the flow difference at these points is calculated. The mean value and standard deviation of all the flow differences are obtained, and the difference of integral area between the two curves is calculated. Based on the above statistics, an evaluation function is proposed to judge whether the spectrum is abnormal or not and the degree of anomaly. A large number of experiments have proved that this method has a good effect of splicing abnormal spectrum detection.
【作者單位】: 山東大學(xué)(威海)機電與信息工程學(xué)院;中國科學(xué)院光學(xué)天文重點實驗室國家天文臺;
【基金】:國家自然科學(xué)基金項目(U1431102)資助
【分類號】:P111
本文編號:2355676
[Abstract]:Splicing anomaly is a phenomenon of spectral continuity in the regions of red and blue splicing. In the spectral processing of LAMOST, the stability of the instrument, the observation conditions and the response function obtained are all the causes of the abnormal splicing. Whether spectral splicing is normal or not has an important effect on the quality of subsequent work such as spectral distribution. An automatic detection method of splicing abnormal spectrum is presented, which improves the working efficiency effectively. This study can provide an automatic tag for LAMOST data to evaluate the splicing quality, and can also provide users with a choice when using the data. The method firstly normalizes the flow rate of the spectrum to be measured, removes the sodium line, and divides it into red and blue ends, and then fits the red and blue ends respectively. Finally, for two fitting curves, a series of points with equal wavelength spacing are selected, and the flow difference at these points is calculated. The mean value and standard deviation of all the flow differences are obtained, and the difference of integral area between the two curves is calculated. Based on the above statistics, an evaluation function is proposed to judge whether the spectrum is abnormal or not and the degree of anomaly. A large number of experiments have proved that this method has a good effect of splicing abnormal spectrum detection.
【作者單位】: 山東大學(xué)(威海)機電與信息工程學(xué)院;中國科學(xué)院光學(xué)天文重點實驗室國家天文臺;
【基金】:國家自然科學(xué)基金項目(U1431102)資助
【分類號】:P111
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