1. CONTINUOUS SENSORS
• There are a number of defining properties of interest when considering sensors,
- Accuracy - a sensor will statistically vary about an exact reading. If we take a statistical range for all readings (e.g., ±3 standard deviations) this will be a reasonable accuracy. Accuracy can also be given as a relative value (e.g. percentage)
- Resolution - Typically used for systems that ‘step’ through readings. This is the smallest increment that the sensor can detect.
- Repeatability - When a single sensor condition is made and repeated, there will be a small variation for that particular reading. This is the repeatability.
- Range - Natural limits for the sensor
- Dynamic Response - the frequency range for regular operation of the sensor. Typically sensors will have an upper operation frequency, occasionally there will be lower frequency limits.
- Environmental - temperature and humidity limits exist for many sensors
- Calibration - most sensors require some degree of calibration, and their readings may drift over time.
1.1 INPUT ISSUES
1.2 SENSOR TYPES
1.3 ANGULAR POSITION
1.4 LINEAR POSITION
1.8 FLOW RATE
1.11 LIGHT INTENSITY
1.13 PRACTICE PROBLEMS