{"id":912,"date":"2025-08-16T14:42:28","date_gmt":"2025-08-16T05:42:28","guid":{"rendered":"https:\/\/acoustic-measurement.com\/?post_type=technology&#038;p=912"},"modified":"2025-08-04T14:49:11","modified_gmt":"2025-08-04T05:49:11","slug":"non-invasive-acoustic-testing-for-sealed-devices","status":"publish","type":"technology","link":"https:\/\/acoustic-measurement.com\/en\/technology\/non-invasive-acoustic-testing-for-sealed-devices\/","title":{"rendered":"Non-Invasive Acoustic Testing for Sealed Devices \u2014 Inspecting Internal Sounds from Outside with AEB \u00d7 HBK Sensors \u2014"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Introduction: How Do You Measure Sounds You Can\u2019t Reach?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Many modern devices\u2014from smart speakers to sealed sensors\u2014generate internal sounds that must be evaluated for quality assurance.<br>However, opening the enclosure or placing sensors inside is often not possible due to:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Waterproofing or dustproofing requirements<\/strong><\/li>\n\n\n\n<li><strong>High-voltage or sensitive internal circuitry<\/strong><\/li>\n\n\n\n<li><strong>Production constraints in mass testing environments<\/strong><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The solution: <strong>acoustic inspection from the outside<\/strong>, using a controlled environment and precision measurement tools.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>System Overview: AEB \u00d7 HBK for External Acoustic Sensing<\/strong><\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"tableSmall\"><thead><tr><th>Component<\/th><th>Description<\/th><\/tr><\/thead><tbody><tr><th>Measurement Environment<\/th><td>AEB (Anechoic Box): Blocks environmental noise and reflections<\/td><\/tr><tr><th>Sensors<\/th><td>HBK Free-Field Microphones + LAN-XI front-end<\/td><\/tr><tr><th>Target Products<\/th><td>Sealed enclosures, potted modules, water-resistant electronics<\/td><\/tr><tr><th>Analysis Software<\/th><td>HBK PULSE \/ BK Connect for FFT, comparison, and anomaly detection<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">This setup allows for <strong>stable, repeatable measurements of internal acoustic behavior<\/strong>, without opening the device.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Applications and Use Cases<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Detecting <strong>abnormal resonance or buzzing<\/strong> inside an enclosure<\/li>\n\n\n\n<li>Identifying loose components or vibrating panels without physical access<\/li>\n\n\n\n<li>Monitoring <strong>back-side cavity behavior<\/strong> in speaker modules<\/li>\n\n\n\n<li>Checking for <strong>air leakage or mechanical misalignment<\/strong> via acoustic patterns<\/li>\n\n\n\n<li>Comparing frequency signatures across multiple units for consistency<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Key Advantages<\/strong><\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"tableSmall\"><tbody><tr><th>Non-invasive<\/th><td>No need to open, disassemble, or connect to internal points<\/td><\/tr><tr><th>Consistent<\/th><td>High repeatability thanks to AEB\u2019s quiet, reflection-free space<\/td><\/tr><tr><th>Quantifiable<\/th><td>Recordable FFT data, usable for production QC logging<\/td><\/tr><tr><th>Flexible<\/th><td>Suitable for development, incoming inspection, and aging tests<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Ideal for<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Bluetooth speakers, wireless modules, and IoT devices<\/li>\n\n\n\n<li>Medical devices with sealed or sterilized casings<\/li>\n\n\n\n<li>Manufacturers of acoustic or structural enclosures<\/li>\n\n\n\n<li>Engineering teams analyzing <strong>changes caused by design modifications<\/strong><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Customization &amp; Integration Support<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Custom AEB sizing for your device portfolio<\/li>\n\n\n\n<li>HBK microphone and range selection based on acoustic target<\/li>\n\n\n\n<li>Threshold-based NG\/OK logic with spectrum overlay comparison<\/li>\n\n\n\n<li>Integration with automation (PLC, barcode scanning, etc.)<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u25b6 <strong>[<a href=\"https:\/\/acoustic-measurement.com\/en\/contact\/\"><strong>Contact Moritani for System Integration Support<\/strong><\/a>]<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Introduction: How Do You Measure Sounds You Can\u2019t Reach? Many modern devices\u2014from smart speakers to sealed sensors\u2014generate internal sounds that must be evaluated for quality assurance.However, opening the enclosure or placing sensors inside is often not possible due to: The solution: acoustic inspection from the outside, using a controlled environment and precision measurement tools. System [&hellip;]<\/p>\n","protected":false},"featured_media":0,"parent":0,"template":"","solution_cat":[4],"class_list":["post-912","technology","type-technology","status-publish","hentry","solution_cat-tax_aeb","en-US"],"acf":[],"_links":{"self":[{"href":"https:\/\/acoustic-measurement.com\/wp-json\/wp\/v2\/technology\/912","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/acoustic-measurement.com\/wp-json\/wp\/v2\/technology"}],"about":[{"href":"https:\/\/acoustic-measurement.com\/wp-json\/wp\/v2\/types\/technology"}],"wp:attachment":[{"href":"https:\/\/acoustic-measurement.com\/wp-json\/wp\/v2\/media?parent=912"}],"wp:term":[{"taxonomy":"solution_cat","embeddable":true,"href":"https:\/\/acoustic-measurement.com\/wp-json\/wp\/v2\/solution_cat?post=912"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}