quantifying absorbance in LabView from amplitude.

[phrivera]

I am currently trying to develop a way to convert amplitude to absorbance, and to be honest I am not sure if this can be done using LabView.  Can this even be done?

[LabVIEW_Joel]

Hi,

LabVIEW can do almost any math operation (spherical bessel functions, etc...).  So, as long as you can develop an algorythm that is: absorbance as a function of amplitude (Y = Absorbance(amplitude)) you will be fine. 

I assume that amplitude is a acquired signals value.  Just work the algorythm, and then push the acquired data through your analysis routine before displaying on a graph, writing to a file, or whatever your use case is.

Let me know if you have any questions.

J

[johnsold]

Absorbance in optical instruments is based on the logarithm of the amplitude. One hundred percent transmission equals 0 absorbance. 10% transmission is absorbance = 1.0 (if I recall correctly). On most instruments absorbance ranges from 0 to 4 (0.01% T?). The resolution of your A/D converter will be the limiting factor at high absorbance unless you change the gain (and the corresponding scaling in the software).

Lynn