logarithmic operator
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2013 ◽  
Vol 868 (1) ◽  
pp. 223-270 ◽  
Author(s):  
A.M. Gainutdinov ◽  
R. Vasseur

1972 ◽  
Vol 18 (6) ◽  
pp. 568-570 ◽  
Author(s):  
Leonard Walker ◽  
Elias Amador

Abstract The photocell transmittance output from continuous-flow colorimeters can be converted into linear absorbance by means of a simple solid-state circuit. The circuit includes a field effect transistor operational amplifier and a logarithmic operator, plus several stabilizing circuit networks. The working range is 1.2 absorbance units, which for most applications is an improvement of 50% over the unmodified colorimeter, at wavelengths of 420 to 700 nm. The output can drive the conventional AutoAnalyzer recorder, or a 2-input, low-cost recorder such as the Heath Kit IR-18M.


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