Meaning
Signal generation techniques that apply discrete, short-duration energy bursts to a sensor or material help minimize power consumption and thermal drift. Instrumentation designers use pulsed excitation to run resistive sensors, such as thermistors and strain gauges, without causing them to heat up internally. This method drives the sensor with a brief pulse of current only when a measurement is taken, returning it to a low-power state between readings.
The resulting duty cycle reduction allows high-precision measurements to be performed with minimal energy draw.
Power Efficiency
Distributors of battery-powered industrial sensors highlight this design technique to appeal to buyers who need long-term field reliability. By utilizing pulsed excitation, these wireless sensor nodes can operate for years on a single primary battery. This efficiency reduces maintenance costs and lowers the total cost of ownership for the end-user.
Contractual Specification
Procurement contracts for high-precision measurement systems often require this drive method to be implemented in the analog front end. If the supplier’s hardware does not support this feature, the system may fail to meet the required drift and power budgets specified in the purchase agreement.
System Design
Engineers synchronize the analog-to-digital converter with the drive pulses to ensure that measurements are taken only when the signal has stabilized. This precise timing prevents measurement errors from noise and transient currents.
