Passive instruments do not require a separate power source for measuring the vibratory response of a vibratory system.


Passive instruments are designed to measure the vibratory response of a system without the need for an external power source. These instruments are typically simple and do not require any additional energy input to function. Here are a few reasons why passive instruments do not require a separate power source:

1. Working Principle:
Passive instruments work on the principle of energy conversion. They convert the mechanical vibrations of the system into a measurable form, such as electrical signals or mechanical displacement. This conversion process does not require any external power input.

2. Sensing Mechanism:
Passive instruments use various sensing mechanisms to measure the vibratory response. These mechanisms include accelerometers, strain gauges, and displacement sensors. These sensors are designed to directly convert the mechanical vibrations into a measurable quantity without the need for an external power source.

3. Energy Harvesting:
Some passive instruments utilize energy harvesting techniques to power themselves. These instruments can extract a small amount of energy from the vibrations of the system and use it to operate. This eliminates the need for a separate power source.

4. Low Power Consumption:
Passive instruments are designed to have low power consumption to ensure that they can operate without a separate power source. They are engineered to be highly efficient in converting the available energy into a measurable output.

In contrast, active instruments require a separate power source for measuring the vibratory response of a system. These instruments typically incorporate an external power supply to operate and may include additional circuitry for signal amplification or processing.

In conclusion, passive instruments are capable of measuring the vibratory response of a system without the need for a separate power source. They work based on energy conversion principles and are designed to be self-powered or have low power consumption.