The application of Scanning Acoustic Microscopy (SAM) in the Multi-Layer Ceramic Capacitor (MLCC) sector is crucial, primarily focusing on the following key areas:

I. Core Detection Capabilities

A. Defect Type Recognition

• Inspection Scope: SAM can precisely detect various micro-defects within MLCCs, including delaminations, cracks, air voids, porosity, and pseudo-solder defects. By generating high-resolution images from ultrasonic reflection signals, the technique supports both qualitative and quantitative analysis of defects (e.g., defect area, depth, and percentage).
• Superior Sensitivity: The technique is particularly sensitive to delamination defects, offering a distinct advantage over X-ray detection technology, which often fails to detect air-filled flaws.

B. Internal Structure Integrity Analysis

• Dimensional Analysis: SAM provides comprehensive internal quality mapping by utilizing multi-layer scanning and cross-sectional imaging.
• Key Targets: It assesses the structural integrity of the inner dielectric layers and electrode connections, quantifying flaw distribution and density.

II. Technical Advantages

A. Non-Destructive Testing (NDT)

• Sample Preservation: The testing process does not require the structural compromise of the MLCC, making it suitable for high-volume full inspection and critical reliability screening.

B. Efficiency and Intelligence

• Automation: Equipped with intelligent screening functions, SAM can perform batch inspection on similar products, pinpointing specific regions of interest, thereby boosting efficiency.
• Error Reduction: It supports automated defect identification and classification, significantly minimizing human operational errors.

C. Resolution and Frequency Adaptation

• High Resolution: By employing high-frequency ultrasound (e.g., $50\text{ MHz}$), the system can penetrate the multi-layered ceramic structure of the MLCC, achieving precise localization of minute defects.
• Dimensional Mapping: Support for delamination scanning and cross-sectional imaging provides a three-dimensional internal quality map.

III. Typical Application Scenarios

A. Production Quality Control

• Process Monitoring: Conducting 100% inspection during the MLCC manufacturing process to evaluate the bonding quality between the internal dielectric layers and electrode layers.
• Failure Prevention: Preventing component failure caused by intermittent connections or internal delamination.

B. Reliability Verification

• High-Reliability Markets: Mandatory full-spectrum non-destructive screening of MLCC products for sectors like aerospace, automotive electronics, and power systems to ensure stability under extreme environmental conditions.

IV. Technical Comparison and Industry Value

Industry Impact: SAM is instrumental in driving the miniaturization and higher density of MLCCs, meeting the stringent high-reliability component demands of emerging sectors such as 5G communications and New Energy vehicles.

Conclusion: By integrating high-frequency ultrasound technology with intelligent analysis, SAM has become the indispensable core NDT tool in the MLCC industry, significantly improving product yield and elevating the overall technological standard of the sector.