Classify sensors based on their transduction principles and provide examples for each classification.

Sensors can be classified based on their transduction principles into the following categories:

1. Mechanical Sensors: These sensors work on the principle of change in physical properties. For example, a pressure sensor measures pressure by detecting the deformation of a diaphragm.

2. Electrical Sensors: These sensors convert changes in physical quantities into electrical signals. For example, a thermocouple generates a voltage proportional to the temperature difference between its two junctions.

3. Optical Sensors: These sensors work on the principle of modulation of light. For example, a photodiode generates a current proportional to the incident light intensity.

4. Thermal Sensors: These sensors work on the principle of change in temperature. For example, a thermistor changes its resistance with temperature.

5. Magnetic Sensors: These sensors work on the principle of change in magnetic field. For example, a Hall effect sensor generates a voltage proportional to the magnetic field.

6. Chemical Sensors: These sensors work on the principle of chemical reaction. For example, a pH sensor measures the hydrogen ion concentration in a solution.

7. Biological Sensors: These sensors work on the principle of interaction of an analyte with a biological system. For example, a glucose sensor measures the glucose concentration in blood.

8. Acoustic Sensors: These sensors work on the principle of change in sound waves. For example, a microphone converts sound into an electrical signal.

Each of these sensor types has its own unique transduction principle, which is the method by which it converts a physical quantity into an electrical signal.