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Example D : Null measurements

3. MEASUREMENT METHODS. 3.1. Deflection, difference, and null methods. Example D : Null measurements. Let us first define some new terms that describe the interface of a measurement system:.

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Example D : Null measurements

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  1. 3. MEASUREMENT METHODS. 3.1. Deflection, difference, and null methods Example D: Null measurements Let us first define some new terms that describe the interface of a measurement system: • the transducer is any device that converts a physical signal of one type into a physical signal of another type, • the measurement transducer is the transducer that does not destroy the information to be measured, • the input transduceror sensor is the transducer that converts non-electrical signals into electrical signals, • the output transducer or actuator is the transducer that converts electrical signals into non-electrical signals. Reference: [1]

  2. 3. MEASUREMENT METHODS. 3.1. Deflection, difference, and null methods Example D: Null measurements Input transducer (sensor) Non-electrical signal Sensor Electrical signal ES N-ES

  3. 3. MEASUREMENT METHODS. 3.1. Deflection, difference, and null methods Example D: Null measurements Output transducer (actuator) Electrical signal Actuator Non-electrical signal N-ES ES

  4. 3. MEASUREMENT METHODS. 3.1. Deflection, difference, and null methods Example D: Null measurements Measurement system interface Measurement System Sensor Actuator Non-electrical signals Non-electrical signals Sensor Actuator

  5. 3. MEASUREMENT METHODS. 3.1. Deflection, difference, and null methods Example D: Null measurements Our aim in this example is to eliminate temperature drift in the sensitivity of a dc magnetic field sensor with the help of a linear temperature-insensitive reciprocal actuator. Reference (Helmholtz coils) Ha VS Vo Hact Sensor Actuator Vs Hact T1 T2 T1 T2 Ha Vo

  6. 3. MEASUREMENT METHODS. 3.1. Deflection, difference, and null methods Example D: Null measurements Any ideas?

  7. 3. MEASUREMENT METHODS. 3.1. Deflection, difference, and null methods Example E: Difference measurements Any ideas?

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