Sensors and Measurement Systems Flashcards
Why do we measure?
- Monitoring processes
- Thermometers, barometers for monitoring weather
- Control processes and operations
- Feedback control systems
- Experimental engineering analysis
- Decisions are made from measured data
- Poor data → Poor foundation for decision making → Disaster!
How to obtain good quality of measurements?
- Full documentation
- If possible, according to standard protocol – Example: SAE J211 – Instrumentation for Impact Test – Part 1
- Calibrate all systems before and after testing
- Repeated measurements done by an independent group
List different types of sensors in Laboratory.
In the laboratory
- Load cells
- Accelerometers
- Rotational velocity sensors
- Pressure transducers
- Displacement transducers
- Gyros
- Temperature sensors
- Cameras
- Volume flow
- Temperature
- Position
List different types of sensors in production vehicles (safety).
- Acceleration, roll, and yaw
- Deformation
- Suspension travel (Potentiometers)
- Wheel speed sensors (Halleffect)
- Object identification and tracking sensor (camera)
- Distance sensors (radar, lidar)
- …
Explain Displacement Sensors
Explain Strain Gauge Sensors
A strain gauge is a device used to measure strain on an object. Invented by Edward E. Simmons and Arthur C. Ruge in 1938, the most common type of strain gauge consists of an insulating flexible backing which supports a metallic foil pattern. The gauge is attached to the object by a suitable adhesive, such as cyanoacrylate.[1] As the object is deformed, the foil is deformed, causing its electrical resistance to change. This resistance change, usually measured using a Wheatstone bridge, is related to the strain by the quantity known as the gauge factor.
Which are the physical properties of Displacement, Velocity and Accelerations?
Explain the Dynamic effects of Accelerometers.
Explain Sensors and Transducers…
Sensors and Transducers
- The mass and the strength of the transducer influence the object that you are measuring on…
- Ideal transducer
- No mass
- No volume
- Measure at one point
- Measure in one single direction
- Only measuring quantities of interest
- DC to infinite frequency response
- Linear
Explain Sensor Sensitivity
How to measure changes in resistance?
Explain process of data sampling
Explain Aliasing.
Explain Sampling speed to avoid aliasing.
Explain differences between analog and digital signals.
Explain Setting Limits Allows DAQ Device to Make Better Use of Number of Bits in ADC
Setting Limits Allows DAQ (Data Aquisition) Device to Make Better Use of Number of Bits in ADC
Explain Different types of noise.
How to handle Electrical noise.
Explain electrical setup of Analogue filters.
Explain Electrical setup of Band-pass Filter.
Explain how filters can improve EMG signal.
Explain Digital filter and give an example.
