|
|
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.)
|
|
IEEE 1451.2 architecture
|
| | 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
|
| | digital signal conditioner |
|
|
Evaluation of measured quantity
|
| | evaluation of measured quantity |
|
|
Adaptive concept of calibration
|
| | adaptive concept of calibration |
|
|
|
|
University of Ljubljana
|
