Schlieren Imaging System
Optical setup with parabolic mirrors and knives to visualize air flow and shock waves via density gradients. Classified HTS 9013.80.91.00 for other optical instruments in aerodynamic research. Excludes machine vision systems.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If consisting primarily of uncoated optical mirrors
Unmounted objective lenses/mirrors classify in 9002 regardless of end use.
If configured specifically for flow measurement
Measuring optical instruments for physical phenomena go to 9031.
If part of gas turbine testing apparatus
Parts principally for chapter 84 turbojet test equipment classify there.
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Import Tips & Compliance
• Document optical path diagrams showing schlieren-specific mirrors and cutoff
• Declare research end-use to potentially qualify for duty exemptions
• Separate mirrors if imported individually, as they may classify by material
Related Products under HTS 9013.80.91.00
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A helium-neon gas laser tube used in scientific instruments for alignment and interferometry. It generates a continuous visible red laser beam and falls under HTS 9013.80.91.00 as a laser other than laser diodes, not specified elsewhere. This classification covers standalone optical appliances for precision applications.
Holographic Interferometer
An optical instrument using lasers to measure surface deformations and vibrations via holography. Classified in HTS 9013.80.91.00 as other optical appliances not elsewhere specified, distinct from basic telescopes or measuring tools. Ideal for non-destructive testing in engineering.
Optical Spectrum Analyzer
A device that analyzes the optical spectrum of light sources using diffraction gratings and detectors. It qualifies under HTS 9013.80.91.00 for other optical instruments not specified elsewhere, used in photonics R&D. Excludes electrical spectrum analyzers.
Laser Beam Profiler
An instrument using CCD cameras and optics to measure laser beam intensity profiles and quality (M² factor). Falls under HTS 9013.80.91.00 as other optical appliances for laser characterization. Not a general measuring telescope.
Fabry-Perot Interferometer
Precision optical cavity with parallel mirrors for measuring laser wavelengths and fine spectra. HTS 9013.80.91.00 covers this as other unspecified optical instruments for spectroscopy. Not a scanning confocal microscope.
Laser Alignment Tool
Portable optical device combining laser source, beam expander, and target for machinery alignment. Under HTS 9013.80.91.00 as other optical appliances, not technical machine parts. Used in industrial maintenance.