Self-energising event detectors
Sensor Driven's detectors chips use energy from the event to be detected, to activate sensor electronics. Please see the introductory video below (4 minutes).
This technology originated in the Electrical Energy Management Research Group, at the University of Bristol, and is now licensed to Sensor Driven Ltd.
Based on self-energising event detectors, we have developed the ability to monitor many active and passive transducers, with detection thresholds down to 10 millivolt, consuming only around 10 nanowatts. When detectors are triggered, the sensor consumes around 1 microjoule to check and log the event. As a result, decades of lifetime are obtained from a coin cell, if the events occur less than once a minute.
Sensor-driven alerts can be generated from:
Temperature, overheating, frost
Sound, ultra-sound, sonic remote control
Ingress, leakage, humidity
Motion, vibration, tampering, theft, subsidence, acceleration
Voltage and current signals
Structural damage, cracks, crack propagation, impact
Pressure, strain, breakage, intrusion
Magnetic fields, proximity sensors
Light, infrared, remote control
Radio-frequency signals, inductive or capacitive transfer
Features, advantages, and benefits
Sensor-driven detection versus periodic sampling
Most sensors are periodically polled to check if the signal exceeds a defined threshold. Power is consumed both when polling and when sleeping between measurements. High frequency signals require rapid polling to avoid missing an event, and measurement power limits battery lifetime. Slowly changing signals can be sampled infrequently and sleep power limits battery lifetime.
Sensor Driven's self-energising event detectors, by contrast, are continuously aware, as they use the sensor signal as their wake-up call and power source. They do not consume battery power sleeping, nor do they measure irrelevant information. All battery resources are directed towards relevant events, enabling ultra-long lifetimes and very small batteries.
Samples and datasheets
We have provided a number of companies with self-energising event detector chips. If you would like to collaborate on a new product, please contact us.