JianHu JH-Transmittance Tester

Overview

The JianHu JH-Transmittance Tester is a benchtop optical instrument engineered for precise, repeatable measurement of visible-light transmittance (T%) across flat, transparent, or semi-transparent solid samples. It operates on the fundamental principle of spectrophotometric transmittance analysis—comparing incident radiant flux (I₀) at wavelengths from 380 nm to 780 nm against transmitted flux (I) through the sample, calculating T% = (I/I₀) × 100. Its optical path integrates a stabilized tungsten-halogen light source, precision collimating optics, a calibrated silicon photodiode detector, and a thermally stable sample chamber. Designed for traceable metrology, the system incorporates factory-calibrated reference standards traceable to NIM (National Institute of Metrology, China) and conforms to international transmittance testing protocols used in optical material qualification, display component verification, and thin-film R&D.

Key Features

• High-fidelity visible-spectrum measurement (380–780 nm) with optical resolution ≤1 nm, enabling spectral profiling of transmission edges and bandpass characteristics.
• Automated zero/reference calibration routine with dual-position shutter mechanism—ensuring baseline stability and minimizing drift over extended operation.
• Adjustable sample aperture (10–100 mm diameter) accommodates standard optical substrates, laminated films, coated glass, polymer sheets, and display cover lenses without mechanical modification.
• Integrated temperature-compensated photodetector electronics delivering ±0.2% T repeatability under ambient lab conditions (23 ± 2 °C, 40–60% RH).
• Rugged aluminum alloy chassis with EMI-shielded enclosure, designed for continuous use in teaching laboratories, QC environments, and low-vibration R&D spaces.
• Compliance-ready firmware architecture supporting audit trails, user access levels, and data integrity safeguards aligned with GLP and ISO/IEC 17025 documentation requirements.

Sample Compatibility & Compliance

The JH-Transmittance Tester accepts rigid or semi-rigid planar specimens up to 5 mm thickness and 120 mm × 120 mm footprint. Common applications include optical filters, AR/AF coatings on smartphone cover glass, PET and TPU screen protectors, acrylic and polycarbonate glazing, optical adhesives, and thin-film solar substrates. The instrument satisfies key regulatory and industrial test standards including ISO 9050 (glass in building—determination of light transmittance), ASTM D1003 (standard test method for haze and luminous transmittance of transparent plastics), and GB/T 2410 (Chinese national standard for determination of transmittance and haze of transparent plastics). All measurement reports generated by JianHuTrans software include embedded metadata (operator ID, timestamp, calibration certificate ID, environmental log) to support FDA 21 CFR Part 11–compliant workflows when configured with digital signature modules.

Software & Data Management

JianHuTrans v3.2 is a Windows-native application providing real-time spectral visualization, batch measurement sequencing, statistical process control (SPC) charting, and export to CSV, PDF, and XML formats. The software implements role-based user authentication (Admin, Operator, Viewer), full electronic audit trail logging (including parameter changes, calibration events, and report generation), and optional integration with LIMS via ODBC drivers. Raw spectral data files (.jht) are stored with embedded CRC-32 checksums to ensure data integrity. For academic and institutional users, the software supports multi-instrument synchronization mode—enabling comparative transmittance mapping across multiple samples within a single experimental session. All firmware updates and calibration certificate renewals are delivered through a secure, TLS-encrypted portal requiring institutional credentials.

Applications

• Quality assurance of anti-glare, oleophobic, and nano-ceramic coated screen protectors—validating claimed transmittance ≥90% across the sRGB gamut.
• Optical characterization of encapsulation materials in OLED and microLED display manufacturing, where sub-0.5% transmittance deviation impacts color uniformity and brightness binning.
• Teaching laboratory experiments in photonics, materials science, and physical chemistry—demonstrating Beer-Lambert law deviations in doped polymer matrices.
• Regulatory testing of automotive glazing per UN Regulation No. 43, verifying minimum 70% luminous transmittance for windshields and side windows.
• R&D evaluation of transparent conductive oxides (TCOs), such as ITO and AZO films on flexible PET substrates, correlating sheet resistance with integrated visible transmittance.

FAQ

What wavelength range does the JH-Transmittance Tester cover, and is it suitable for UV or NIR measurements?
The instrument is optimized for the CIE-standard photopic visible spectrum (380–780 nm) and does not extend into ultraviolet (780 nm) regions. For UV transmittance, a dedicated UV-Vis spectrophotometer with deuterium/tungsten dual-source configuration is recommended.
Can the JH-Transmittance Tester measure haze simultaneously with transmittance?
No—it measures total luminous transmittance only. Haze assessment requires a separate integrating sphere configuration compliant with ASTM D1003; JianHu offers the optional JH-Haze Module for concurrent T% and haze reporting.
Is the calibration certificate NIST-traceable?
Calibration is traceable to NIM (China’s national metrology institute); NIST-traceable calibration is available upon request with additional lead time and documentation fees.
Does the system support automated pass/fail judgment against user-defined transmittance limits?
Yes—JianHuTrans v3.2 includes configurable acceptance thresholds with visual alert indicators and automatic flagging of out-of-spec results in exported reports.
What maintenance is required to ensure long-term measurement stability?
Annual recalibration is recommended. Daily operation requires only lint-free lens cleaning and verification using the included certified reference standard (certified T% = 92.5 ± 0.15 at 550 nm).