RelativeResourceManager(4) - Digital and analog signals...

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Digital and analog signals, introduction to optical spectroscopy, and light sources Chem 420 September 08, 2008
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Update on problem set z For Problem 1 you must show work. Do not simply use spreadsheet or calculator to obtain mean and standard deviation. z Problem 2b—What is the standard error of the estimate? z Just give regression errors from Excel
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Digital and analog signals z Analog signals z Magnitude of voltage, current, charge, or power z Continuous in both amplitude and time z Digital information z Data encoded in only discrete levels
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Analog to digital to conversion z Limited by bit resolution of ADC z 4-bit card has 2 4 = 16 discrete binary levels z 8-bit card has 2 8 = 256 discrete binary levels z 10-bit card has 2 10 = 1024 discrete binary levels z Maximum resolution comes from full use of ADC voltage range. z Trade-offs z More bits is usually slower z More expensive K.A. Rubinson, J.F. Rubinson, Contemporary Instrumental Analysis , 2000 .
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Serial and parallel binary encoding (serial)
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Example of binary encoding z Write the number 2008 in binary. z How many bits are needed? 2 11 2 10 2 9 2 8 2 7 2 6 2 5 2 4 2 3 2 2 2 1 2 0 2048 1024 512 256 128 64 32 16 8 4 2 1 1 1111011000 10 bits are needed 11111011000 : 1024 + 512 + 256 + 128 + 64 + 16 + 8 = 2008
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Questions?
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Introduction to Optical Spectroscopy (Chapters 6-7) Chemistry 420
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Fundamentals of electromagnetic radiation 34 Planck's constant 6.626 10 J s =frequency in Hz Eh h ν = == 8 m speed of light 3.00 10 s =wavelength c c λ =
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Electromagnetic spectrum http://www.yorku.ca/eye/spectrum.gif
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RelativeResourceManager(4) - Digital and analog signals...

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