Lanjing LJ-SX128 Portable Real-Time Acoustic Imaging Camera

Overview

The Lanjing LJ-SX128 Portable Real-Time Acoustic Imaging Camera is a precision-engineered passive acoustic measurement instrument based on beamforming technology with a 128-channel MEMS digital microphone array. It captures and visualizes sound pressure distribution across a defined spatial field—converting acoustic energy into high-temporal-resolution color-coded sound intensity maps overlaid on real-time optical imagery. Unlike conventional single-point sound level meters or basic ultrasonic leak detectors, the LJ-SX128 applies delay-and-sum beamforming algorithms in real time to localize and quantify sound sources with angular resolution optimized for industrial distances (0.5–50 m). Its dual-band capability—spanning audible (2 kHz) through near-ultrasonic (48 kHz) frequencies—enables detection of both mechanical anomalies (e.g., bearing faults, valve chatter) and high-frequency emissions from partial discharge (PD) in energized HV equipment or pressurized gas leaks. Designed for field-deployable operation, it operates independently of external cameras or calibration references, integrating optical imaging and acoustic processing within a single handheld chassis.

Key Features

• Integrated Acoustic-Optical Architecture: Built-in 5″ capacitive touchscreen with native 800 × 480 optical imaging (fixed 3.9 mm lens, 64° FoV) and synchronized acoustic overlay—no external camera mounting or alignment required.
• Real-Time Beamforming Engine: On-device FPGA-accelerated processing delivers continuous 25 FPS acoustic image generation and video recording without latency-induced motion blur—even during dynamic inspection of moving machinery or live-switchgear operations.
• Wideband Frequency Coverage: Configurable spectral analysis from 2 kHz to 48 kHz supports multi-scenario diagnostics: low-frequency tonal emissions (e.g., compressor imbalance), mid-band turbulence noise (e.g., pipe erosion), and high-frequency transient bursts (e.g., corona discharge, micro-leaks).
• Robust Field Deployment: IP51-rated enclosure, −20 °C to +55 °C operational range, sub-1 kg mass, and dual-battery system (internal + hot-swappable external) ensure sustained use in substations, petrochemical plants, and manufacturing floors.
• Comprehensive Diagnostics Suite: Preconfigured analysis modes for gas leak localization (pressure-dependent sensitivity mapping), PD pattern recognition (pulse repetition rate, phase-resolved partial discharge [PRPD] compatibility), and time-domain waveform capture with timestamped metadata.

Sample Compatibility & Compliance

The LJ-SX128 is validated for non-contact, non-intrusive assessment of energized high-voltage assets (IEC 60270-compliant PD screening), pressurized pneumatic/hydraulic systems (ASTM E2653-22 for ultrasonic leak detection), and rotating equipment under load. It requires no physical coupling, vacuum chambers, or acoustic enclosures. All acoustic data—including raw channel waveforms, beamformed intensity matrices, and annotated image/video exports—are stored with embedded timestamps, operator ID, GPS coordinates (optional via Wi-Fi geotagging), and device serial traceability. The firmware architecture supports audit-ready data integrity: file-level checksums, write-once storage policies, and export logs compliant with ISO/IEC 17025 documentation requirements for accredited laboratories. While not FDA-regulated, its data management structure aligns with GLP principles for engineering asset health records.

Software & Data Management

Acquisition and post-processing are managed via Lanjing’s proprietary AcoustiView™ desktop software (Windows 10/11), which imports .acx project files containing synchronized audio, video, metadata, and beamforming parameters. The software enables spectral slicing, dB-scale normalization, ROI-based amplitude quantification, and export to CSV, MP4, PNG, and industry-standard HDF5 formats. All internal storage (64 GB eMMC) enforces automatic file versioning and cyclic overwrite protection for critical inspections. Remote configuration, firmware updates, and live streaming are supported over secure Wi-Fi (WPA2-Enterprise compatible). Microphone array self-diagnostic routines—executed at power-on and on-demand—verify channel gain consistency, phase coherence, and SNR thresholds per IEC 61000-4-3 immunity guidelines.

Applications

• Non-invasive detection and localization of compressed air, SF₆, or natural gas leaks in pipelines, flanges, valves, and regulators—quantifying leak severity via calibrated dB SPL mapping.
• Routine condition monitoring of medium- and high-voltage switchgear, transformers, and GIS compartments using phase-synchronized PD imaging for early insulation degradation assessment.
• Vibration-induced acoustic emission (AE) source identification in motors, gearboxes, and pumps—correlating acoustic hotspots with mechanical wear patterns.
• Acoustic signature validation of safety-critical components (e.g., pressure relief valves, emergency shutdown actuators) during functional testing.
• Regulatory compliance verification for ISO 50001 energy audits—documenting compressed air losses as quantifiable energy waste metrics.

FAQ

What is the minimum detectable leak rate under standard conditions?
The LJ-SX128 achieves detection limits equivalent to ~0.1 SCFM (2.8 L/min) of air at 100 psi, measured at 1 m distance per ASTM E2653-22 Annex A1 methodology.
Can the device operate while charging?
Yes—continuous operation is supported when connected to the 12 V / 3 A DC power adapter; battery charging and acquisition occur concurrently without interruption.
Is third-party software integration possible?
Raw PCM audio streams and metadata JSON files are accessible via USB mass storage mode; API documentation for TCP/IP control and data streaming is available under NDA for OEM integration.
Does the system support multi-camera synchronization?
No—LJ-SX128 is a single-unit imaging platform. Synchronized multi-angle acoustic surveys require sequential manual repositioning and post-hoc spatial registration in AcoustiView™.
How is measurement traceability maintained for QA/QC reporting?
Each exported dataset includes embedded EXIF-like acoustic headers: sensor calibration date, firmware revision, environmental temperature/humidity (via onboard sensors), and user-defined inspection tags—all retained in unmodified format throughout export and archival.