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Professor
What is Spectroscopy光谱? Well, the simplest definition I can give you is that Spectroscopy is the study of the interaction between matter and light. Now, visible light consists of different colors or wavelengths, which together make up what's called a spectrum, a band of colors, like you see in a rainbow. And all substances, all forms of matter, can be distinguished according to what wavelength of light they absorb and which ones they reflect. It's like every element has its own spectral signature. If we can read that signature, we can identify the element. And that's exactly what spectroscopy does.
Now, Laser Spectroscopy激光光谱学 works by measuring very precisely what parts of the spectrum are absorbed by different substances.
Let's say a museum curator管理员comes to you with a problem. She's come across this painting that appears to be an original - let's say, a Rembrandt伦勃朗画作. And she wants to acquire it for her museum. But she's got a problem: she's not absolutely certain it's an original. So, what do you do? How do you determine whether the painting's authentic?
you'll need to make a list of characteristics the painting would have to have to be a Rembrandt. Then you have to discover whether the painting in question has those characteristics. So first of all, you'll need to know the techniques Rembrandt used when he applied paint to canvas帆布；油画布- his brushstrokes一笔,一画,绘画的技巧, how thickly he applied his paint. So you’d need to work with an art historian who has expert knowledge of Rembrandt's style. You'd have to know when he created his paintings, um... what pigments he used, in other words, what ingredients he used to make different colors of paint, ‘cuz the ingredients used in paints and binding agents plus varnishes, finishes, what have you, have changed over time.
Since you're trying to verify that's a Rembrandt, the ingredients in the pigment would need to have been used during Rembrandt's lifetime - in the 17th century. And that's where chemistry comes in. You've got to find out what's in those pigments, learn their composition, and that requires lab work - detective work really - in a word, Spectroscopy.
So, how do we use Spectroscopy? Well, we put an infrared红外线的microscope - a spectroscope - on tiny tiny bits of paint. And using ultraviolet light we can see the spectral signature of each component part of the pigment. Then we compare these signatures with those of particular elements like zinc or lead, to determine what the pigment was made of. So, you can see why this type of analysis requires a knowledge of the history of pigments, right? How and when they were made? Say we determined a pigment was made with zinc, for example. We know the spectral signature of zinc. And it matches that of the paint sample. We also know that zinc wasn't discovered until the 18th century. And since Rembrandt lived during the 17th century, we know he couldn't have painted it.
Now, Spectroscopy has a very distinct advantage over previous methods of analyzing our works, because it's not invasive. You don't have to remove big chips of paint to do your analysis, which is what other methods require. All you do is train the microscope on tiny flecks 一小点of paint and analyze them.
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发表于 2012-4-19 03:21:49
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