OTS - Optical Transmittance Spectroscopy

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This simple, yet elegant system is ideal for accurate, repeatable measurements of optical filters, glass and ophthalmic lenses.

We’ve combined our expertise in miniature spectrometers and accessories with experience as a manufacturer of precision optics to create a compact system for real-time transmittance measurement of ophthalmic lenses and other optical components. The Ocean Optics Optical Transmittance Spectrophotometer (OTS) is ideal for both in-line and in-lab applications where transmittance accuracy (to +/- 1.0%) and precision (+/- 0.1%) are critical. Common applications include measurement of optical coatings, windows and filters, and glass and plastic components.

About the System
The OTS covers the 380 – 850 nm wavelength range and accepts samples from 10 – 76 mm in diameter and up to 25.4 mm thickness. The system comprises several components:

High-resolution miniature linear CCD-array spectrometer configured for 380 –850 nm
High-power, 20-watt tungsten halogen light source
Fiber optic integrating sphere for collecting signal transmitted through the sample
Optics for improved beam collimation and spectral sensitivity distribution
Sample fixture (z-stage) to hold sample in place and exclude ambient light
Short optical fiber to channel signal from the integrating sphere to the spectrometer
SpectraSuite Operating Software for calculating %T, color and other measurement characteristics

Under the Hood

Characteristics
Spectral range:	380-850 nm
Detection:	Miniature fiber optic spectrometer
Light source:	High-power tungsten halogen (360 – 2000 nm)
Sample collection:	Fiber optic integrating sphere
Color calculations:	CIE color characteristics
Measurement calibration:	Manual calibration using known filter standard (not included); calibration time <30 seconds
System calibration:	Recommend annual recalibration
Transmittance calibration standards:	Not included
Typical samples measured:	Windows, filters, glass and plastic lenses
Sample size:	10 – 76 mm diameter, up to 25.4 mm thickness
Optical stage:	Aluminum (black anodized)
Software:	SpectraSuite Operating Software (contact an Applications Scientist for custom version)
Quality:	Calibration referenced to accepted standards
Manufacturing compliance:	CE/UL/RoHS/WEEE
Performance
Transmittance measurement accuracy:	+/-1.0%
Transmittance measurement precision:	+/-0.1%
Data acquisition time:	1.5 ms
Light source output:	20 watts
Light source stability:	0.5% (~5 minutes to stabilize)
Light source drift:	<0.3% per hour
Bulb lifetime:	2,000 hours
Bulb color temperature:	3,000 K
Light source temperature:	5 °C - 35 °C
Light source humidity:	5 – 95% at 40 °C
Dust:	Ambient
Computer Requirements
Operating systems:	Windows 98/Me/2000/XP, Mac OS X and Linux with USB port; Any 32-bit Windows OS with serial port
Computer interfaces:	USB 2.0 @ 480 Mbps; RS-232 (2-wire) @ 57.6 K baud

Contact an Ocean Optics Applications Scientist