n*****g 发帖数: 4117 | 1 ☆─────────────────────────────────────☆
lxwu () 于 (Mon May 25 19:10:27 2009) 提到:
一直很困惑为什么长波长的光容易穿透tissue?
什么原理呢?
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ion (-------〉) 于 (Mon May 25 19:23:07 2009) 提到:
长波绕行能力强
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lxwu () 于 (Mon May 25 19:56:37 2009) 提到:
衍射?
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modelg (忙碌中) 于 (Mon May 25 20:07:45 2009) 提到:
去物理版问问?他们应该知道吧
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yaofei (老牛) 于 (Mon May 25 20:18:02 2009) |
j******0 发帖数: 258 | 2 More than 99.99% of light is reflected. The rest goes into tissue and gets
absorbed. A very tiny is able to penetrate through, depending on the
thickness and composition of the tissue. Water is a major absorber. In
medial optics, the 600-900nm range is employed because water has weak
absorption and light is able to go deeper in the tissue. It is called "
spectroscopic window" of human body. |
g*****n 发帖数: 30 | 3 这个才是最合理的解释
【在 j******0 的大作中提到】 : More than 99.99% of light is reflected. The rest goes into tissue and gets : absorbed. A very tiny is able to penetrate through, depending on the : thickness and composition of the tissue. Water is a major absorber. In : medial optics, the 600-900nm range is employed because water has weak : absorption and light is able to go deeper in the tissue. It is called " : spectroscopic window" of human body.
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m*********s 发帖数: 1188 | 4 正解.
【在 j******0 的大作中提到】 : More than 99.99% of light is reflected. The rest goes into tissue and gets : absorbed. A very tiny is able to penetrate through, depending on the : thickness and composition of the tissue. Water is a major absorber. In : medial optics, the 600-900nm range is employed because water has weak : absorption and light is able to go deeper in the tissue. It is called " : spectroscopic window" of human body.
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