Sensor Design
Semiconductor assemblies combine light sensitive elements with signal processing electronics on a single substrate to improve the signal to noise ratio. Efficient photo detector integration is essential for the high speed scanners that detect edge position and web breaks on paper machines. By placing the amplifier and the photodiode in close proximity, the system reduces the electrical interference that often plagues long cable runs in industrial settings.
Signal Efficiency
Fast response times are achieved when the parasitic capacitance of the circuit is minimized through advanced packaging. A system using photo detector integration can operate at higher frequencies, which allows for the detection of smaller defects at faster web speeds. This hardware configuration also lowers the power consumption of the sensor array.
Reliability Factor
Durability in harsh environments is a primary advantage of sealing the optical and electronic components together. Because photo detector integration eliminates many external connections, the sensor is less susceptible to failure from moisture or chemical exposure. This quality is necessary for units installed in the wet end of the machine or near the chemical coating stations.
The long term stability of the integrated unit reduces the frequency of maintenance and calibration cycles. Such an integrated approach also allows for sophisticated on chip diagnostics that alert operators to potential sensor degradation before a total failure occurs.
