回复sonics发表于：2015/12/2 9:03:21悬赏金额：
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各位老师好，本人使用岛津GCMS-TQ8040三重四级杆，在计算信噪比的时候，发现有几种信噪比的算法，ASTM，RMS和峰至峰，请哪位老师讲一讲，这几种信噪比计算的原理，以及什么情况下用哪一种信噪比的计算方法，为什么？？？
非常感谢！
Noise Calculation Methods
There are three methods for calculating noise:ASTM, RMS, and Peak to Peak.
ASTM
A 15-minute baseline period is first separated into 30 second sections. Noise width of each section is individually calculated as described below. Then the noise widths of all sections are averaged to obtain the ASTM noise.
[Calculation procedure]
(1) The slope of the approximated linear line for all data points within each section is calculated by the least square method.
(2) Two parallel lines are assumed by shifting the slope upward and downward, so that all data points within the section fall between two lines.
(3) The distance between the two parallel lines in the intensity axis direction is defined as the noise width for the section.
RMS
The RMS noise refers to the standard deviation of the measurement point signals detected within a specified section.
Peak to Peak
"Noise" refers to the value of the "maximum intensity value - minimum intensity value" in the noise time range.
jxyan 回复于：2015/12/2 21:02:39
岛津GCMS-TQ8040三重四级杆没用过，，你看看下边链接中的帖子。。
http://www.instrument.com.cn/search/search_bbs?keywords=%E4%BF%A1%E5%99%AA%E6%AF%94&loginSource=15&tabType=2&position=&forumid=44&PaperType=&search_sort=&FromDate=&ToDate=
byron1111 回复于：2015/12/4 19:14:50
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