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SMRT Probe

Category: Sentinel Power

Ridgetop’s SMRT Probe (Sample Mode Response Technique™ Probe) is a resonant voltage-sampling sensor, shown below, that is attached to a module or assembly to extract degradation signatures. SMRT Probe monitors power systems by injecting a voltage stimulus to measure effective resistance and capacitance, enabling prognostic and degradation analysis. The system response will change due to loss of filter capacitance, changes in equivalent series resistance (ESR), MOSFET switch degradation, or other component degradation. The sensor processing unit (SPU) located on the host Sentinel Power™ prognostic analysis platform controls SMRT Probe and processes the data sampled by the probe.


  • Application:Power Systems
  • Sensor: SMRT Probe/RingDown
  • Data Type: Frequency
  • Reasoner: ARULE
  • GUI: Sentinel Dashboard


The front-end software of SMRT Probe performs a digital signal processing (DSP) analysis of the captured frequency response, including anomaly detection, producing a prognostic signature. SMRT Probe’s time-stamped data output includes 16-bit resistance and 16-bit capacitance measurements.

  • Power converters and inverters
  • Power supplies
  • Electromechanical power drive stages, such as electromechanical actuators
  • Heating elements, like those of aerospace total air temperature probes

Features & benefits

  • Shows change in system response as power devices degrade with age or stress
  • Prognostic indicator is independent of noise effects
  • Effective extraction of degradation signatures on highly damped and “stiff” systems
  • Optional ARULE™ algorithm to calculate state of health (SoH) and remaining useful life (RUL)
  • Applicable to a wide range of power systems
  • Compact form factor
  • Networked device communicates with host by Ethernet cable


Capacitance range: 132 µF to 13,200 µF
Input Voltage Range:  2.5 to 33 V
Connectivity  RJ45 Ethernet IEEE 802.3
Size: L = 7.5 in. (19.05 cm), W = 6 in. (15.24 cm), 

H = 1.5 in. (3.81 cm)

Frequency response range 850 Hz to 4.1 KHz 
Input connector: BNC
Temperature range: 0 to 40 °C
Power supply: 24 VDC/1.25 A

Resistance and capacitance

16-bit resolution
ESR range: 0.005 to 100 ohms



Adaptive Remaining Useful Life Reasoner for Prognostics and Health Management (PHM) Applications
ARULE Product Brief
Ridgetop’s Adaptive Remaining Useful Life Estimator (ARULE) is a powerful reasoner to determine the remaining useful life (RUL) and state of health (SoH) of complex systems. Working from acquired sensor data, ARULE employs an advanced prediction method related to extended Kalman filtering (EKF) to produce new RUL and SoH estimates for each new sensor data point.
ARULE is versatile and can be used for determining electronic and mechanical fatigue damage. The reasoner calculates fault-to-failure progression (FFP) signatures, accurate RUL (time-to-failure) estimates, and SoH estimates, which provide an early warning indicator for system maintenance personnel to schedule service to the system prior to catastrophic failure.

ARULE relies on diagnostic sensor data and a predefined model to produce an RUL estimate. It requires a sensor to "sense" data that are above a predefined "good-as-new" floor and below a "failed" ceiling. A new RUL estimate is produced based on changes to the model space; additionally, the new RUL estimate is used to produce a new SoH estimate.


  • Power systems
  • Battery management systems
  • Actuator control systems
  • Cable connection integrity