Monitoring Methodology
Passive ultrasonic detection identifies transient elastic waves generated by rapid release of energy within a material undergoing deformation or fracture. Inside a high speed spinning frame, acoustic emission sensing identifies the specific frequency of a breaking flax strand before the physical gap is visible to the naked eye. The technology detects the structural failure of single filaments by measuring the high frequency signals emitted during molecular chain cleavage.
It operates independently of ambient audible noise because the piezoelectric transducers focus on the 100 kHz to 1 MHz range. This non destructive technique provides real time feedback on the health of the spinning process without interrupting the movement of the roving.
Mechanical Application
Continuous surveillance of the scutching blade contact point allows for the detection of excessive mechanical stress on the plant stem. When the blades strike the flax stalks with too much force, acoustic emission sensing registers the distinct sound of xylem shattering. Operators use this data to adjust the feed rate or blade speed immediately.
This prevents the degradation of long fibres into tow during the primary extraction phase.
Operational Limit
Effective signal reception depends entirely on the distance between the sensor and the source of the vibration. Because signal attenuation occurs rapidly through air or grease, sensors must be mounted directly onto the bearing housing or the frame chassis. Measurement accuracy drops noticeably if the material being tested is overly saturated with water.
Moisture dampens the elastic waves and shifts the frequency profile away from the calibrated detection range.
