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Which component is used in spectrophotometer for control, Signal Processing, and Communication functions?

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Which component is used in spectrophotometer for control, Signal Processing, and Communication functions?

(a) Detector

(b) Microprocessor

(c) Deuterium Lamp

(d) Tungsten Lamp

This question was posed to me by my college professor while I was bunking the class.

My doubt stems from Pneumotachometers in chapter Pulmonary Function Analysers of Biomedical Instrumentation

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The correct choice is (b) Microprocessor

To explain: A microprocessor, in a spectrophotometer, could be used for the following functions: Control functions: Wavelength scanning, automatic light source selection, control of slit width, detector sensitivity, etc. Signal processing functions: Baseline correction, signal smoothing, calculation of % T, absorbance and concentration, derivative, etc. Communication functions: Keyboard entry, menu-driven operations, data presentation, warning display, communication with external systems, etc.

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