Data Acquisition and Signal Conditioning : Data Acquisition and Signal Conditioning An Overview
-Rakesh Objective : Objective W5H of DAS …..EXAMPLE : …..EXAMPLE Process terminologies used.
Real-world implementation. System = Formula 1 Racing Car : System = Formula 1 Racing Car One of the most sophisticated cars.
Fitted with Most complex Telemetry system considering the form-factor.
Fastest car ever built.
[Telemetry system: is a technology that allows the remote measurement and reporting of information of interest to the system designer or operator Slide 5: Sensors: 150-200
Type A : For Monitoring Parameters.
Type B : For Controlling Parameters.
Type C : A+B = Calibration.
Example: a wheel speed sensor (type C) not only monitors the wheel speed but also the speed of the vehicle, location on the track and an input to traction and launch control systems.
[Sensor: A device that sense physical phenomena and produce equivalent Electrical signals / signal of interest.]
[Physical phenomena: Temperature, Pressure, Heat, Flow, Mass/Load, Energy(Cosmic rays, Photons etc.) Slide 6: Engine: Revs per minute, fuel and oil pressure, water and oil temperature, turbo charger boost pressure, exhaust gas temperature, battery voltage, inlet air temperature and throttle position.
Chassis: Wheel speed, steering angle, lateral and longitudinal G-force (applied from braking and cornering), Brake line pressure, damper movement and gear position.
Advanced Chassis control: Ride height, drive shaft or prop shaft torque, suspension loads, tyre pressure and compound temperature, and brake disk temperature.
Optional: aerodynamic parameters, including air speed and local air pressures. Slide 7: Accelerometer
Active pixel sensor
Air flow meter
Carbon paste electrode
Carbon monoxide detector
Catalytic bead sensor
Chemical field-effect transistor
Carbon dioxide sensor
Displacement receiver Electrolyte–insulator–semiconductor sensor
Hall effect sensor
Heat flux sensor
Inertial Reference Unit
Infrared point sensor
Lace Sensor a guitar pickup Laser distance measurement sensor
Light-addressable potentiometric sensor
Linear variable differential transformer
Liquid capacitive inclinometers
Magnetic anomaly detector
Magnetic level gauge
Mass flow sensor
Microwave chemistry sensor
Net radiometer infrared sensor
Nitrogen oxide sensor
Passive infrared sensor
Quantum sensor Rain sensor
Sniffer coil (detects electromagnetic fields)
Sulphur dioxide sensors
Throttle position sensor
Torque sensor Touch pad
Variable reluctance sensor
Vibrating structure gyroscope
Wheel speed sensor
Yaw rate sensor
magnetic reed sensor Slide 8: RS232, RS485, Optical Fiber cable, Wireless Signal conditioning
Electrical signals generated by transducers often need to be converted to a form acceptable to the data acquisition hardware, particularly the A/D converter which converts
the signal data to the required digital format. In addition, many transducers require some form of excitation or bridge completion for proper and accurate operation.
The principal tasks performed by signal conditioning are:
• Excitation Slide 9: Data acquisition is the process by which physical phenomena from the real world are transformed into electrical signals that are measured and converted into a digital format for processing, analysis, and storage by a computer. Slide 11: Laboratory Virtual Instrumentation Engineering Workbench Slide 12: LabVIEW is a graphical program development application developed by National Instruments in 1986 to integrate engineering tasks like;
interfacing computers with the instruments, collecting, storing, analyzing, transmitting measured data,
developing program in a graphical environment, providing an effective user interface.
LabVIEW delivers real solutions to the practical problems faster than any other graphical environment. …Conclusion : …Conclusion Data acquisition system goal: Get data into digital form where it can be processed easily and losslessly.
highly accurate, versatile and reliable solution. Slide 14: Future? Slide 15: MEMS ASIC + = DOC/SOC Slide 16: Thank you