English
全部
搜索
图片
视频
地图
资讯
更多
购物
航班
旅游
笔记本
Top stories
Sports
U.S.
Local
World
Science
Technology
Entertainment
Business
More
Politics
时间不限
过去 1 小时
过去 24 小时
过去 7 天
过去 30 天
最佳匹配
最新
电子工程专辑
1 年
激光光声光谱(PAS,PhotoAcousticSpectroscopy)检测技术
激光光声光谱检测技术是一种基于光声效应的光谱检测方法。 一、基本原理 当物质吸收周期性调制的光能量后,会以热的形式将光能转化为热能,导致物质温度周期性变化。由于热胀冷缩,这种温度变化会引起物质体积的周期性变化,从而产生压力波,即声信号。
当前正在显示可能无法访问的结果。
隐藏无法访问的结果
今日热点
Makes Grammy history
Resigns over Epstein links
Missing teen found dead
Trump threatens to sue Noah
Wins TX special election
Mother reported missing
To launch ‘Project Vault’
Gold and silver prices fall
To close for 2 years
Flips TX state Senate seat
Achieves EGOT status
Georgia hotel shooting
FBI probes possible ‘bio lab’
Iran summons EU diplomats
Sign Rams extension deal
Plans to cut tariffs on India
Hired as Cardinals HC
Award-winning poet dies
How to watch Super Bowl
Iran’s leader warns US
Phil predicts more winter
Two more arrested in MN
Bangladesh ex-PM sentenced
Texas measles outbreak
White Sox acquire Hicks
Indonesia reinstates Grok
China executes gang leaders
Storm in North Carolina
NBA All-Star Game rosters
5-yr-old, father return to MN
Witkoff to visit Israel
'Send Help' tops box office
反馈