Skoog/Holler/Crouch Principles of Instrumental Analysis, 6th ed.
Chapter 1 Instructor’s Manual
1-1. A transducer is a device that converts chemical or physical information into an electrical signal or the reverse. The most common input transducers convert chemical or physical information into a current, voltage, or charge, and the most common output transducers convert electrical signals into some numerical form. 1-2. 1-3. 1-4. The information processor in a visual color measuring system is the human brain. The detector in a spectrograph is a photographic film or plate. Smoke detectors are of two types: photodetectors and ionization detectors. The photodetectors consist of …(생략)
a light source, such as a light-emitting diode (LED) and a photodiode to produce a current proportional to the intensity of light from the LED. When smoke enters the space between the LED and the photodiode, the photocurrent decreases, which sets off an alarm. In this case the photodiode is the tran