Theft detection system for catalytic converter

A computer implemented method comprising:

• receiving logic signals representative of axial movement of a magnetic ball disposed within a coil;
• sampling the logic signals for a first period of time;
• generating a sum of the logic signals for each of multiple sub-periods of time corresponding to the first period of time;
• comparing each sum to a first threshold;
• counting the number of sub-period sums exceeding the first threshold;
• and
• generating an alarm signal in response to the number of sub-period sums exceeding the first threshold exceeding a second threshold.

A device comprising:

• a processor;
• and
• a memory device coupled to the processor and having a program stored thereon for execution by the processor to perform operations comprising:
• receiving logic signals representative of axial movement of a magnetic ball disposed within a coil;
• sampling the logic signals for a first period of time;
• generating a sum of the logic signals for each of multiple sub-periods of time corresponding to the first period of time;
• comparing each sum to a first threshold;
• counting the number of sub-period sums exceeding the first threshold;
• and
• generating an alarm signal in response to the number of sub-period sums exceeding the first threshold exceeding a second threshold.