BM 2203 SENSORS AND MEASUREMENTS l Lecture Notes for BME - Third (3rd) semester
BM 2203 Lecture Notes
UNIT I SCIENCE OF MEASUREMENT
Measurement System – Instrumentation – Classification and Characteristics of
Transducers – Static and Dynamic – Errors in Measurements – Calibration – Primary and
UNIT II DISPLACEMENT, PRESSURE,TEMPERATURE SENSORS
Strain Gauge: Gauge factor, sensing elements, configuration, unbounded strain gage,
biomedical applications; strain gauge as displacement & pressure transducers: force
summing devices, capacitive transducer, inductive transducer, LVDT,
Passive types: RTD materials & range, relative resistance vs. temperature characteristics,
thermistor characteristics, biomedical applications of Temperature sensors. Active type:
Thermocouple – characteristics
UNIT III PHOTOELECTRIC AND PIEZO ELECTRIC SENSORS
Phototube, Photo Multiplier Tube (PMT), photovoltaic, photoconductive cells, photo
diodes, phototransistor, comparison of photoelectric transducers, spectro-photometric
applications of photo electric transducers. Piezoelectric active transducer and biomedical
applications as pressure & Ultrasound transducer.
UNIT IV SIGNAL CONDITIONING & SIGNAL ANALYSER
AC and DC Bridges –wheat stone bridge, Kelvin, Maxwell, Hay, Schering -Pre-amplifier –
impedance matching circuits – isolation amplifier. Spectrum analyzer.
UNIT V DISPLAY AND RECORDING DEVICES
Digital voltmeter – Multi meter – CRO – block diagram, CRT – vertical & horizontal
deflection system, DSO, LCD monitor, PMMC writing systems, servo recorders,
photographic recorder, magnetic tape recorder, X–Y recorder, thermal recorder.