Sensors & transducers
MEASUREMENT OF AXIAL ROLL RUNOUT In order to enable the guide or coating rolls to operate at the highest precision, the axial roll runout is continuously measured. For this purpose, eddy current displacement sensors detect the axial movement of the roll by determining the distance to the roll. In addition to the compact design, the advantage of the eddy current sensors is their resistance to harsh environments: the sensors provide precise measurement results even when oil, dirt, temperatures or pressure act on the sensor. The compact eddyNCDT 3001 sensors also have an integrated controller, which further simplifies integration.
3D SURFACE INSPECTION
The scanCONTROL laser line profile sensors enable stable measurement with high resolution and can be used to build 3D visualisation and inspection of coated films and battery pouches. Defects with the smallest geometries, for example, spalling and inclusions, are reliably recognised and output by the sensors.
of up to 200°C. Due to integrated temperature compensation, they deliver stable measurement values in the sub-micrometer range.
MEASURING THE THICKNESS OF WET LAYERS
Confocal chromatic sensors from Micro-Epsilon are also capable of monitoring the coating thickness of wet materials. These sensors provide both extremely high resolution and high measuring rates. Installing several sensors next to each other enables concurrent determination of the homogeneity of the coating over the complete strip width.
ONE-SIDED THICKNESS MEASUREMENTS OF BATTERY ELECTRODE COATINGS The new combiSENSOR KSB6430 combines an eddy current sensor with a capacitive displacement sensor in a single housing. This unique sensor concept enables high precision one-sided thickness measurements of battery coatings transported over chrome coated steel roller. Due to its robust design and high accuracy, the sensor is suitable for inline thickness measurements in battery film coating processes.
WEB EDGE CONTROL OF ELECTRODE FILM
During the production of battery cells, electrode and separator films must be guided reliably. Optical optoCONTROL micrometers detect the required edge position for web edge control with high accuracy. Operating several micrometers enables the concurrent detection of the web width.
Instrumentation Monthly May 2025
OFFLINE THICKNESS MEASUREMENT OF BATTERY FILMS
The new capaNCDT TFG6220 has been developed to determine the film thickness of test coupons from battery film production runs. The dual capacitive sensor system combined with an integrated vacuum bed ensures wrinkle-free support of the delicate material and enables offline thickness measurement with maximum precision for quality inspection and referencing of films.
CAPACITIVE DISTANCE SENSORS FOR ROLLER GAP CONTROL
Inductive sensors are normally used to monitor and control calender and coating rollers. As the requirements of end customers and plant manufacturers increase, Micro-Epsilon uses its capacitive sensors, often in a flat design, to measure the direct roller gap. These are available in various designs and detect the roller gap with micrometer accuracy. These compact sensors can be integrated into confined installation spaces to measure directly against the rollers or the roller suspension. Direct gap measurement is possible via integration on the roller, for example, using a flat 0.9 mm thick sensor. The sensor can measure on both sides and therefore detects two distances. Another option is indirect gap measurement via integration on the shaft using an extremely compact capacitive sensor with dimensions of just 4 x 3.5 mm. Its robust design and high temperature stability enables the sensor to be used in high ambient temperatures.
COATING APPLICATION ON EDGES Electrodes must be coated with extreme precision. Any excess coating can build up along the coated edge which can cause issues when the material is being coiled. Therefore, laser scanners from Micro-Epsilon inspect the coating profile on the edge. This is how anomalies of the coating and undulations are detected.
DETECTION OF CURVED EDGES AFTER CUTTING
Films may have curvatures and deformations after longitudinal cutting. In order to detect these deviations reliably, laser profile sensors from Micro-Epsilon are used. Due to their extremely high resolution and insensitivity to reflecting surfaces, these sensors provide stable measurement results.
POSITION CONTROL OF BATTERY CELLS After the battery cells have been assembled, laser scanners from Micro-Epsilon inspect their completeness and position. These precise profile sensors generate a 3D image that is then compared with the CAD data.
BATTERY EXPANSION DURING CHARGING
When the battery is first charged, the battery cell expands. To detect the critical point before rupture and to interrupt the charging process, the battery is installed in a test stand. Laser sensors from Micro- Epsilon check the vertical expansion in several charge and discharge cycles. The compact sensors can also be accommodated in confined spaces and deliver high measurement accuracy.
Micro-Epsilon
www.micro-epsilon.co.uk 17
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