TML ARF/ARH/ARJ Series Piezoresistive Accelerometers

Overview

The TML ARF, ARH, ARJ, ARE, ARS, ARM, and ARK series are precision piezoresistive accelerometers engineered for high-fidelity dynamic acceleration and vibration measurement across structural health monitoring, mechanical testing, transportation dynamics, and civil infrastructure applications. Unlike charge-mode or IEPE-based sensors, these devices utilize micro-machined silicon piezoresistive elements integrated with temperature-compensated Wheatstone bridge circuitry—enabling true DC-coupled response, zero-phase shift at low frequencies (<0.1 Hz), and stable baseline retention under static loading conditions. This architecture supports direct measurement of quasi-static acceleration (e.g., tilt-induced gravity components), transient shock events, and broadband vibratory motion from 0.01 Hz to over 10 kHz (model-dependent). Designed and manufactured in Japan under strict JIS Q 9001-certified quality control, each sensor undergoes individual calibration traceable to NMIJ (National Metrology Institute of Japan) standards.

Key Features

• DC-coupled output enables measurement of both dynamic vibration and static acceleration (e.g., gravitational vector, slow ramping loads)
• Piezoresistive sensing technology ensures excellent long-term zero stability and minimal thermal drift (typ. <±0.02 %FS/°C)
• Compact, lightweight design minimizes mass-loading effects—critical for modal analysis of slender structures (e.g., cable-stayed bridge stay cables, turbine blades)
• Triaxial models (ARM-A-T, ARF-A-T, ARJ-A-T, ARE-A-T) provide synchronized orthogonal measurements without spatial interpolation error
• IP68-rated waterproof housing (ARH-A series) permits permanent embedment in concrete, submersion in freshwater/marine environments, or long-term outdoor deployment
• High-frequency variants (ARJ-A, ARK-A) optimized for shock and impact testing—with resonant frequencies up to 35 kHz and rise times <10 µs
• Strain-gauge-derived sensitivity calibration ensures linearity better than ±0.5 %FS across full operating range

Sample Compatibility & Compliance

TML accelerometers are routinely deployed on metallic, composite, concrete, and timber substrates across diverse field and laboratory settings—including ASTM E756 (vibration transmissibility), ISO 5347 (vibration sensor calibration), ISO 10816 (machinery vibration severity), and JSME S001 (Japanese structural monitoring guidelines). The ARH-A series complies with JIS A 1131 for embedded concrete sensors and meets IEC 60068-2 environmental stress test requirements (damp heat, thermal cycling, mechanical shock). All models support GLP-compliant data acquisition when paired with TML’s DS-2000 series signal conditioners, which provide 24-bit ADC resolution, programmable gain/filtering, and audit-trail-enabled configuration logging per FDA 21 CFR Part 11 requirements.

Software & Data Management

Raw analog outputs interface seamlessly with industry-standard DAQ systems (NI PXI, Dewesoft, HBM Catman, or Keysight PathWave). TML provides calibration certificates with individual sensitivity factors, nonlinearity, and transverse sensitivity data—importable into MATLAB, Python (SciPy), or LabVIEW for automated correction and spectral post-processing. Optional TML-DAQLink software enables real-time FFT, time-domain waveform capture, and alarm-triggered event logging. For structural monitoring networks, sensor metadata (serial number, calibration date, mounting orientation) is stored in XML-based device descriptors compliant with ISO/IEC 11179 metadata registry standards.

Applications

• Bridge cable tension estimation via natural frequency shift analysis (ARS-A, ARM-A-T)
• Seismic response monitoring of high-rise buildings and nuclear containment structures (ARH-A, ARE-A-T)
• Rotating machinery fault detection (bearing defect frequencies, imbalance harmonics) using ARJ-A-D in gearbox housings
• Vehicle ride comfort evaluation per ISO 2631-1, with triaxial ARM-A-T mounted on seat rails and chassis nodes
• Underwater pile driving impact assessment using submerged ARH-A sensors coupled to sonar arrays
• Wind turbine blade root strain-acceleration correlation studies under turbulent inflow conditions
• Explosive shock wave propagation characterization in geotechnical blast monitoring (ARK-A, ARE-A)

FAQ

Are TML accelerometers compatible with IEPE-powered data acquisition systems?
Standard ARF/ARH/ARJ models require external regulated excitation (typically ±15 V DC). IEPE-compatible versions (e.g., ARF-IEPE series) are available upon request with built-in constant-current supply conditioning.

What is the recommended mounting method for optimal high-frequency fidelity?
For frequencies above 1 kHz, use 10–32 UNC stud mounting with torque-controlled installation (0.5–0.8 N·m) and flat, machined surfaces. Adhesive bonding (epoxy or cyanoacrylate) is suitable up to 5 kHz; surface preparation per ASTM D2093 is advised.

Can ARH-A sensors be embedded directly into fresh concrete without signal degradation?
Yes—ARH-A units feature hermetically sealed stainless-steel housings and polyurethane-cured cable exits rated for alkaline exposure (pH 12.5) and compressive loading up to 40 MPa during curing.

Do calibration certificates include traceability documentation?
Each unit ships with a NMIJ-traceable certificate listing as-found/as-left sensitivity, frequency response (5–5000 Hz), and transverse sensitivity (<3 %), conforming to ISO/IEC 17025 requirements.