Sensor Circuit Evaluation for Manipulation Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Magnetic sensors, particularly differential magnetic sensors, are vulnerable to manipulation and abnormal operating conditions, which can lead to inaccurate readings and potential hazards in critical applications such as medical treatment and transportation, due to external disturbances or misuse.
Innovation Solution
An apparatus comprising a signal processing circuit, a sensor element, and an evaluation circuit that processes input signals to generate an output signal and evaluates sensor signals to detect abnormal operating conditions, ensuring the reliability of measurements by distinguishing between normal and abnormal operating conditions based on predetermined criteria.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If magnetic sensors are used to measure physical quantities, then measurement capability is provided, but the sensors become vulnerable to manipulation and abnormal operating conditions
Solution Approach 1:
The patent applies preliminary action by evaluating the sensor signal for abnormal operating conditions before the measurement is finalized. The evaluation circuit continuously monitors the sensor signal and compares it against expected characteristics, allowing the system to detect manipulation or abnormal conditions before they compromise the measurement integrity.
Solution Approach 2:
The patent implements feedback by using the evaluation circuit to assess the sensor signal and provide information about operating conditions. The evaluation result feeds back into the measurement process, allowing the system to distinguish between valid measurements and those affected by manipulation or abnormal conditions, thereby improving reliability.
2Reliability
If sensor systems are made robust against manipulation through evaluation circuits, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent merges the evaluation function with the existing sensor circuit by integrating the evaluation circuit directly into the sensor signal processing path. This combination allows the system to gain manipulation detection capability without adding completely separate monitoring systems, thereby limiting the increase in overall device complexity.
Data Source
AI summary
An apparatus is described, including: a signal processing circuit adapted to process an input signal to obtain an output signal; a sensor element for sensing a predetermined physical quantity, wherein the sensor element is adapted to generate a sensor signal in response to the predetermined physical quantity; wherein the signal processing unit is adapted to process the input signal to obtain the output signal depending on the sensor signal; and wherein the apparatus further comprises an evaluation circuit adapted to evaluate the sensor signal and to generate an indication signal indicating an abnormal operating condition in case the sensor signal does not fulfill a predetermined normal operation criterion.