Meaning
Electronic feedback mechanisms that adjust the amplification of a received signal in real time maintain consistent data quality across varying conditions. In ultrasonic monitoring of resin flow, adaptive gain control compensates for the loss of signal strength as the melt travels farther from the transducer. This feature ensures that the system detects the flow front with the same sensitivity at the end of the cavity as it does at the gate.
Software algorithms analyze the incoming wave amplitude and increase or decrease the gain to keep the signal within a predefined range.
Signal Normalization
Normalization of the peak height prevents the electronics from saturating when the signal is strong or disappearing when it is weak. During a moulding run, adaptive gain control accounts for small changes in material temperature or pressure that affect sound transmission. This automatic adjustment removes the need for manual recalibration during a production shift.
Attenuation Compensation
Attenuation of energy occurs as the sound wave passes through different layers of the polymer and the steel tool. Because thick parts or highly filled resins absorb more energy, adaptive gain control must apply higher levels of amplification to maintain a usable signal. This mechanism works by measuring the noise floor and the peak signal to calculate the necessary boost.
It ensures that the detection of the internal structure remains accurate even if the resin batch has a higher than expected glass fiber content.
Detection Reliability
Reliability in automated part rejection depends on a stable baseline for every measurement. If the gain remained fixed, a cold start of the machine could produce signals that look like defects. Using this technology allows the monitoring system to adapt to the thermal drift of the machine.
