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Smart sensors
Smart sensors
  • sensor + microcontroller/ASIC/FPGA: embedded system for advanced sensor applications.
Digital evaluation of sensor quantity
  • minimize the offset voltage impact (offset up to 320% of FS signal)
  • Adaptation of full scale range
  • Compensation and measurement sensor nonlinearity and sensor offset temperature drift.
Calibration algorithms
  • Compensation of unwanted dependencies (temp, humidity etc.)
  • Start: Raw sensor, without any offset or temperature compensation
  • Aim: Sensor fully adapted to user's requirements (FS range, precision, conversion rate etc.)

Smart Sensor 1

IEEE 1451.2 architecture

Smart Sensor 2
IEEE 1451.2 architecture

Signal conditioner overview

Classification to compensation of unwanted quantities

  • Analog signal conditioner (passive - resistors, active- with OPAMP)
  • Digital signal conditioner (A/D → MCU → D/A)
  • Mixed signal conditioner (OPAMP + D/A(T) → analog signal)
Type PRO CONTRA
ANALOG speed, cost, simplicity inflexible, irreversible laser trimming
MIXED first order of compensation and linearization only
DIGITAL complete control of sensors, traceability, parameter measurement processing speed, complexity

Digital signal conditioner

Smart Sensor 3
digital signal conditioner

Evaluation of measured quantity

Smart Sensor 4
evaluation of measured quantity

Adaptive concept of calibration

Smart Sensor 5
adaptive concept of calibration
 

Membrane sensor structures
Cantilever actuators
Micro-optical benches
Silicon optical sensors
Silicon radiation sensors
Smart sensors
Microreactors
Nerve-root retractor

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University of Ljubljana