*4.3.1 Sensor design and QR code reader*

Sensor is a heart of the CPOM system. It works as the interface signal processing from objects to the system input. There are many types of the sensors; fiber optic sensor, photo electric sensor, proximity sensor, area sensor, pressure sensor, multifunctional sensor. Such sensors can be used together with precision measurement, PLC, vision system, laser marker, barcode reader, digital microscope and so on. The CPOM system selects fiber optic amplifier. It can easily set light using automatic mode. It is amplified the light around 250 times. The respond speed is 50 μs. The monitor output can be LED or graph. The output can be single, double or analog

**Figure 22.** *The CPOM system development.*

*Automotive Industrial Supply Chain Performance Evaluation under Uncertain Constraints… DOI: http://dx.doi.org/10.5772/intechopen.93679*

output. The right **Figure 23** shows the relation of light intensity and displacement. There are different ranges but the effective performance is set on the certain displacement.

QR recorder is used to track a symbolic information of the production process. The QR code generator can be simply done by software and can link to the QR code reader. **Figure 24** shows the QR code reader using a mobile phone.
