Adamant Namiki NMH-01 Optical Interferometric Internal Circumferential Surface Profilometer
| Brand | Adamant Namiki |
|---|---|
| Origin | Japan |
| Model | NMH-01 |
| Measurement Principle | Optical Interference (Near-Infrared) |
| Measurement Method | Non-contact |
| Measured Parameter | Ra |
| Minimum Measurable Internal Diameter | 1.1 mm |
| Repeatability | σ = 0.2 µm |
Overview
The Adamant Namiki NMH-01 Optical Interferometric Internal Circumferential Surface Profilometer is an advanced metrology instrument engineered for high-precision, non-destructive characterization of internal cylindrical surfaces. Utilizing near-infrared optical interference combined with proprietary micro-optomechanical probe architecture, the NMH-01 enables full-field topographic reconstruction of bore interiors without sectioning or mechanical contact. Its core measurement principle relies on low-coherence interferometry—where axial and angular scanning of a miniaturized interferometric probe generates phase-resolved surface height maps with sub-micron lateral and vertical resolution. Designed specifically for critical small-bore components in aerospace, medical devices, analytical instrumentation, and precision fluid systems, the NMH-01 addresses a longstanding gap in geometric metrology: the inability to simultaneously quantify internal diameter, roundness, form deviation, and surface roughness (Ra) within bores as small as φ1.1 mm.
Key Features
- World’s smallest integrated motorized probe (φ0.9 mm) enabling access to ultra-narrow bores down to φ1.1 mm internal diameter
- Patented optical imaging probe with built-in tilt-compensation algorithm that automatically corrects for workpiece inclination and eccentricity during scanning
- Simultaneous acquisition of multiple geometric parameters: internal diameter, roundness (per ISO 1101), form error (cylindricity, straightness), and arithmetic mean roughness (Ra per ISO 4287/ISO 25178-2)
- Measurement repeatability of σ = 0.2 µm under controlled environmental conditions (temperature-stabilized lab, vibration-isolated bench)
- Non-contact operation eliminates probe wear, surface deformation, or contamination risk—critical for sterile or high-value components
- Integrated semi-transparent calibration tube minimizes optical path fluctuations and enhances phase stability during interferometric acquisition
Sample Compatibility & Compliance
The NMH-01 is optimized for rigid, rotationally symmetric internal surfaces including fuel injector nozzles, hollow surgical instruments, microfluidic channel liners, and precision bearing races. It accommodates materials with moderate reflectivity (e.g., stainless steel, titanium, alumina, fused silica) and supports measurement on both metallic and ceramic substrates. While not intended for highly absorptive or optically scattering surfaces (e.g., black anodized aluminum or porous sintered metals), surface preparation protocols—including light cleaning and optional anti-reflection coating verification—are documented in the operator manual. The system complies with relevant portions of ISO/IEC 17025 for calibration traceability and supports audit-ready documentation required under GLP and GMP environments. All measurement algorithms adhere to definitions and evaluation methods specified in ISO 1101 (geometrical tolerancing), ISO 4287 (profile roughness), and ISO 25178-2 (areal surface texture).
Software & Data Management
The NMH-01 operates via dedicated Windows-based metrology software featuring modular analysis workflows, real-time interferogram visualization, and automated report generation. Raw interferometric data is stored in vendor-neutral HDF5 format with embedded metadata (scan parameters, environmental logs, calibration timestamps). Software includes configurable pass/fail thresholds aligned with engineering drawings, statistical process control (SPC) charting for longitudinal monitoring, and export capabilities to CSV, STEP AP210, and PDF/A-1a for regulatory submission. Audit trail functionality records all user actions, parameter changes, and recalibration events in accordance with FDA 21 CFR Part 11 requirements when configured with electronic signature modules. Data integrity is preserved through SHA-256 hashing of measurement datasets and role-based access control.
Applications
- Aerospace: In-process verification of fuel nozzle internal geometry and surface finish post-electrochemical machining
- Medical Devices: Qualification of lumen surfaces in catheter shafts, endoscope channels, and drug-eluting stent delivery systems
- Fluid Power: Roundness and roughness assessment of hydraulic valve spool bores and servo-actuator cylinders
- Analytical Instrumentation: Metrology validation of capillary columns, nebulizer orifices, and micro-chromatography manifolds
- Research & Development: Correlation studies between internal surface topography and functional performance (e.g., flow resistance, particle adhesion, fatigue initiation)
FAQ
What is the minimum measurable internal diameter?
The NMH-01 achieves reliable measurement down to φ1.1 mm internal diameter using its patented φ0.9 mm motorized interferometric probe.
Does the system require sample sectioning or disassembly?
No—measurements are fully non-contact and non-destructive; intact parts can be evaluated in their as-manufactured condition.
Which surface roughness parameter does it report?
The primary output is arithmetic mean roughness (Ra) calculated per ISO 4287; additional parameters (Rz, Rq, Rsk) are available upon request and subject to optical signal-to-noise ratio.
How is measurement repeatability verified?
Repeatability (σ = 0.2 µm) is validated using NIST-traceable step-height standards and repeated measurements across multiple operators, days, and environmental conditions per ISO 5725-2.
Can the NMH-01 measure tapered or stepped bores?
It is optimized for straight, constant-diameter bores; tapered geometries require custom probe trajectory programming and are supported under advanced service agreements.
