IHARA T5 Plus Transmission Densitometer and Transmittance Meter

Overview

The IHARA T5 Plus Transmission Densitometer and Transmittance Meter is a precision optical instrument engineered for quantitative measurement of optical density (OD) and percent transmittance (%T) across black-and-white transmission media. Based on the principle of photometric absorption analysis—where incident light intensity (I₀) is compared to transmitted intensity (I) using the fundamental relationship OD = log₁₀(I₀/I)—the T5 Plus delivers traceable, repeatable results for quality control and process validation in printing, packaging, display manufacturing, and optical materials R&D. Its compact, battery-free design integrates an internal stabilized tungsten-halogen light source and silicon photodiode detector, optimized for CIE Standard Illuminant A spectral response. The instrument conforms to international standards governing densitometry, including ISO 5-3 (Densitometers for graphic technology), ISO 5-4 (Calibration of transmission densitometers), and ASTM E308 (Computing CIE colors from spectrophotometric data), ensuring metrological consistency across global laboratories.

Key Features

• Portable, benchtop-ready architecture with integrated optical stage—no external alignment or dark-room requirements.
• Three interchangeable aperture sizes (φ1 mm, φ2 mm, φ3 mm) enabling spatially resolved measurements on heterogeneous or patterned samples such as halftone films, lithographic masks, and coated substrates.
• High-resolution density readout up to 2.000 OD with 0.001 OD resolution, supporting both absolute density and relative Δ-density calculations.
• Simultaneous dual-mode display: optical density (D) and percent transmittance (%T), automatically converted in real time per DIN 4512-2 and ISO 5-2 conventions.
• Inter-manufacturer calibration compatibility via user-accessible offset/gain correction—facilitates cross-platform data harmonization when replacing legacy densitometers from X-Rite, GretagMacbeth, or Techkon.
• NIST-traceable calibration film and verification film included for daily performance verification and GLP-compliant audit trails.
• RS-232C serial interface (cable optional) supports automated data logging into LIMS or Excel-based QA databases; compatible with FDA 21 CFR Part 11–compliant software environments when paired with validated acquisition tools.

Sample Compatibility & Compliance

The T5 Plus is validated for transparent and translucent planar materials up to 1.0 mm thickness—including polyester (PET) and polycarbonate films, soda-lime and borosilicate glass substrates, acrylic and epoxy resins, and photographic emulsions. Samples must exhibit minimal scattering (i.e., 1 mm), IHARA offers custom optical path modifications—including extended-depth collimators and motorized sample holders—subject to engineering review. All factory calibrations are performed under ISO/IEC 17025-accredited conditions, and documentation includes full uncertainty budgets per GUM (JCGM 100:2008).

Software & Data Management

While the T5 Plus operates as a standalone instrument, its RS-232C port enables integration with third-party data acquisition platforms. Raw readings (OD, %T, timestamp) are output in ASCII format at 9600 baud, supporting direct ingestion into Python-based QC dashboards, MATLAB analysis pipelines, or validated LabWare LIMS modules. When deployed in regulated environments (e.g., ISO 13485 medical device manufacturing or IATF 16949 automotive supply chains), users may implement electronic audit trails via middleware that logs operator ID, calibration status, and environmental metadata (temperature/humidity). No proprietary software is bundled; this design prioritizes interoperability and long-term data sovereignty.

Applications

• Printing industry: Dot gain evaluation (positive/negative dot area %), ink film thickness estimation, and press run consistency monitoring per ISO 12647-2.
• Flat-panel display manufacturing: Color filter array (CFA) density uniformity mapping and polarizer contrast ratio verification.
• Photomask metrology: Critical dimension (CD) proxy assessment via density gradients on Cr-on-Quartz reticles.
• Pharmaceutical packaging: Transparent blister foil opacity verification for child-resistant compliance (ASTM D1003).
• Academic research: Quantitative kinetics of photochromic polymer degradation under UV exposure, tracked via time-resolved OD shifts.

FAQ

What is the maximum sample thickness supported without modification?
The standard T5 Plus configuration is validated for samples ≤1.0 mm thick. Thicker specimens require optical path extension—contact IHARA Engineering for feasibility assessment.
Does the instrument support color densitometry (CMYK)?
No—the T5 Plus is strictly monochromatic (broadband white light, CIE Illuminant A). For CMYK or spectral densitometry, consider the IHARA T7 series.
Is firmware upgrade capability available?
Firmware updates are performed exclusively by authorized service centers using IHARA’s certified diagnostic suite; end-user reprogramming is not supported to maintain metrological integrity.
Can measurement data be exported in CSV format?
Yes—when connected to a host PC via RS-232C and configured with terminal emulation (e.g., PuTTY) or custom Python scripts, ASCII-formatted output can be redirected to .csv files.
What calibration standards accompany the unit?
Each T5 Plus ships with two NIST-traceable reference films: one certified at OD 0.50 ±0.02 and another at OD 1.50 ±0.03, both with full CoA documentation per ISO/IEC 17025.