| 查看: 510 | 回复: 3 | |||
| 当前主题已经存档。 | |||
| 当前只显示满足指定条件的回帖，点击这里查看本话题的所有回帖 | |||
xmuxiaoyu金虫 (著名写手)
|
[交流]
【求助】请教用monochromator采集光谱的问题
|
||
| 最近要测量非常弱的光的光谱分布，用的是monachromator, 型号是triax 320，不知道大家有没有用过。首先用光电倍增管测量到光的强度大概是10万cps左右。如果将光源连接到monachromator的入口，但是什么也没有测量到，尽管曝光时间在一分钟左右。请问是什么问题呢？是不是因为monachromator的灵敏度不够。望大家多给意见，谢谢。 |
回复此楼» 猜你喜欢
浙江师范大学是怎么坑我的
已经有9人回复
-
浙江师范大学是怎么坑我的
已经有3人回复
-
求教各位大神：2026教育部人文社科青年基金项目何时公示呀？
已经有6人回复
-
面上有专家说实验设备不是我们单位的
已经有8人回复
-
科研求助
已经有4人回复
-
博士去二本高校当辅导员，如何调整心态？
已经有11人回复
-
江苏省自然基金 什么时候出结果
已经有6人回复
-
闲聊
已经有3人回复
xmuxiaoyu
金虫 (著名写手)
- 应助: 0 (幼儿园)
- 金币: 8095.8
- 散金: 31
- 红花: 8
- 帖子: 2511
- 在线: 1315.5小时
- 虫号: 413090
- 注册: 2007-06-26
- 专业: 电化学
4楼2009-09-17 21:29:53
maybe you had to run through your monochromator over its wavelength range.
★ ★ ★ ★ ★ ★ ★ ★
xmuxiaoyu(金币+1,VIP+0):谢谢指点 9-17 03:38
musi429(金币+2,VIP+0):多谢交流~ 9-17 03:38
xmuxiaoyu(金币+5,VIP+0):谢谢 9-17 21:30
xmuxiaoyu(金币+1,VIP+0):谢谢指点 9-17 03:38
musi429(金币+2,VIP+0):多谢交流~ 9-17 03:38
xmuxiaoyu(金币+5,VIP+0):谢谢 9-17 21:30
|
or if you've already known the light source wavelength, then set the monochromator around it and make a narrow scan. 首先用光电倍增管测量到光的强度大概是10万cps左右 As your 光电倍增管 can pick up photons from your light source, then, you may use it to get the spectroscopy of your light source by replacing the installed PIN detector on your spectrometer. Another approach is: 1. checking the background noise of your spectrometer w/o any light in. This may help you to estimate the sensitivity of your spectrometer, and then compared it with that of your PMT. 2. if the sensitivity is compatible, then your light source may be of wide band, and light intensity at each wavelength is too weak to be measurable. 3. if the sensitivity of your spectrometer is only a little bit worse, you may still be able to get the spectroscopy by (a) conducting several measurements and then averaging them. (b) increasing the shutter-open time based on the noise ratio. All suggestion above is based on that you have run your spectrometer at its best for your sample such as its PIN detector at 77 K, the right grating installed (the lowest resolution grating), the greatest slit and the fastest F#. Good luck. 我的monochromator是用CCD 作为detector 1. You can use "bin or binning" setting in your software to combine several pixels of your CCD together for increasing its sensitivity (at the expense of sacrificing its resolution). 2. the exit slit may be not allowed to be adjusted. You may consult the vendor about all your questions. 光投射不到ccd上面 if other people have used your spectrometer for similar measurements, it seems that light can reach CCD sensor. [ Last edited by bote on 2009-9-18 at 12:01 ] |
2楼2009-09-17 03:28:01
xmuxiaoyu
金虫 (著名写手)
- 应助: 0 (幼儿园)
- 金币: 8095.8
- 散金: 31
- 红花: 8
- 帖子: 2511
- 在线: 1315.5小时
- 虫号: 413090
- 注册: 2007-06-26
- 专业: 电化学
3楼2009-09-17 03:38:08