主题：关于信噪比计算

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=

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.

安捷伦的算是用哪种方法，每年仪器校验时都是自动算的，还没怎么注意过方法~~~

原文由 安平(byron1111) 发表:Noise Calculation MethodsThere are three methods for calculating noise:ASTM, RMS, and Peak to Peak.ASTMA 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.RMSThe 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.

老师，请问我们计算噪声的时候要选择哪种计算方式呀，这三种计算方式算出来的S/N差别还挺大的