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EE231 Electronic Instrumentation and Sensors Assignment Sample NUI Galway Ireland

EE231 Electronic Instrumentation and Sensors module introduces students to electronic instrumentation and sensors. The module starts with an overview of electronic circuits and then covers topics such as Wheatstone bridges, op-amps, active filters, data acquisition systems, and sensor interfacing. Students will learn how to use these instruments and sensors in a variety of applications such as biomedical devices, environmental monitoring, and process control.

This module also delivers a fundamental understanding of the principles governing the operation of electronic instruments and sensors. The module covers theoretical and practical aspects of electronic instrumentation and sensors, providing students with the opportunity to design and build their circuits.

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In this section, we are describing some assigned tasks. These are:

Assignment Task 1: State the general characteristics of electronic measurement systems using sensors, and the differences between various types of sensor technologies.

Electronic measurement systems are used to measure a variety of physical quantities, such as temperature, pressure, displacement, and force. These systems usually consist of sensors that convert the physical quantity being measured into an electrical signal, which is then processed by electronic circuitry. There are many different types of sensor technologies available, each with its advantages and disadvantages. Some of the most common sensor technologies used in electronic measurement systems include:

  • Thermocouples: Thermocouples are sensors that measure temperature. They are made up of two conductors of different materials (usual metals) that are joined at one end. When the two conductors are at different temperatures, a potential difference is generated between them. This potential difference can be used to determine the temperature difference between the two conductors.

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  • Thermistors: Thermistors are another type of sensor that can be used to measure temperature. They are made of materials that have a high resistance that changes with temperature. The resistance of a thermistor can be used to determine the temperature of the device.
  • Piezoelectric sensors: Piezoelectric sensors are used to measure pressure, force, or acceleration. They are made of materials that generate an electrical voltage when they are subjected to mechanical stress. The voltage generated by the piezoelectric material can be used to determine the magnitude of the applied force.
  • Optical sensors: Optical sensors are used to measure light intensity, colour, or other optical properties. They usually consist of a light-sensitive element, such as a photodiode or a photoresist, that produces an electrical signal when exposed to light. The intensity of the electrical signal is proportional to the intensity of the incident light.
  • Magnetic sensors: Magnetic sensors are used to measure magnetic fields. They usually consist of a magnetometer, which is a device that measures the strength and direction of a magnetic field.
  • Accelerometers: Accelerometers are used to measure acceleration or the rate of change in velocity. They usually consist of a mass that is free to move in response to acceleration. The magnitude of the acceleration can be determined from the position of the mass.

There are many other types of sensors that can be used in electronic measurement systems. These include pressure sensors, flow sensors, level sensors, and position sensors. The choice of sensor technology to use in a particular application depends on the quantity being measured and the desired accuracy of the measurement.

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Assignment Task 2: Derive expressions for the outputs of a variety of sensor systems based on the inputs and sensing elements deployed.

Thermocouple: The output of a thermocouple sensor is given by:

V = K(T1 – T2)

where V is the output voltage, K is the thermocouple constant, T1 is the temperature of one conductor, and T2 is the temperature of the other conductor.

Thermistor: The output of a thermistor sensor is given by:

V = R0(e^((T-To)/B) – 1)

where V is the output voltage, R0 is the resistance at temperature To, T is the actual temperature, and B is the thermistor constant.

Piezoelectric sensor: The output of a piezoelectric sensor is given by:

V = kP

where V is the output voltage, k is the piezoelectric constant, and P is the applied force.

Optical sensor: The output of an optical sensor is given by:

V = kI

where V is the output voltage, k is the optical constant, and I is the intensity of the incident light.

Magnetic sensor: The output of a magnetic sensor is given by:

V = kB

where V is the output voltage, k is the magnetic constant, and B is the strength of the magnetic field.

Accelerometer: The output of an accelerometer is given by:

V = kA

where V is the output voltage, k is the accelerometer constant, and A is the acceleration.

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Assignment Task 3: Analyse and calculate how a practical measurement system can function for expected and unexpected inputs.

A practical measurement system must be able to function for both expected and unexpected inputs. For example, if a sensor is designed to measure temperature, it should be able to handle both expected inputs (e.g., temperatures within its operating range) and unexpected inputs (e.g., temperatures outside of its operating range). To ensure that a practical measurement system can function for both expected and unexpected inputs, the following factors must be considered:

  • The range of the sensor: The sensor must be able to measure the full range of expected input values. For example, if a temperature sensor has a range of -40°C to 100°C, it should be able to measure temperatures anywhere within that range.
  • The accuracy of the sensor: The sensor must be accurate enough to measure the expected input values with a high degree of precision. For example, if a temperature sensor has an accuracy of ±0.5°C, it should be able to measure temperatures within that range with a high degree of precision.
  • The sensitivity of the sensor: The sensor must be sensitive enough to measure the expected input values with a high degree of accuracy. For example, if a temperature sensor has a sensitivity of 0.1°C, it should be able to measure temperatures within that range with a high degree of accuracy.
  • The resolution of the sensor: The sensor must have a high enough resolution to measure the expected input values with a high degree of accuracy. For example, if a temperature sensor has a resolution of 0.01°C, it should be able to measure temperatures within that range with a high degree of accuracy.
  • The noise level of the sensor: The sensor must have a low enough noise level to allow the measurement of the expected input values with a high degree of accuracy. For example, if a temperature sensor has a noise level of 0.1°C, it should be able to measure temperatures within that range with a high degree of accuracy.

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Assignment Task 4: Design and develop sensors using computer-based simulation tools, and share designed circuits publicly.

There are many computer-based simulation tools available that can be used to design and develop sensors. Some of these tools are listed below:

  • Simulink: Simulink is a graphical programming environment for modelling, simulating, and analyzing dynamic systems. It is used in a wide variety of applications, including automotive, aerospace, communications, electronics, and more.
  • Proteus: Proteus is a software tool for designing, simulating, and verifying electronic circuits. It is used in a wide variety of applications, including automotive, aerospace, communications, electronics, and more.
  • LTspice: LTspice is a software tool for simulating electronic circuits. It is used in a wide variety of applications, including automotive, aerospace, communications, electronics, and more.

All of these tools can be used to design and develop sensors. To share designed circuits publicly, users can upload their designs to online circuit repositories such as CircuitLab or GitHub.

Assignment Task 5: Conduct and report on experiments to verify sensor calibration/measurement and to create a computer-based instrument control.

After designing and developing a sensor, it is important to conduct experiments to verify the sensor’s calibration and measurement. To do this, use a computer-based instrument control to create an experimental setup. Then, report on the results of the experiments in a scientific journal or conference.

Some tips for conducting and reporting on experiments:

  • Choose an appropriate experimental setup: The experimental setup should be chosen based on the objectives of the experiment.
  • Choose an appropriate instrument: The instrument should be chosen based on the type of sensor being tested and the objectives of the experiment.
  • Collect data: Collect data from the sensor during the experiment.
  • Analyze data: Analyze the data collected from the sensor.
  • Report results: Report the results of the experiment in a scientific journal or conference.

To create a computer-based instrument control, use a software tool such as LabVIEW, MATLAB, or Simulink.

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