LCRT-2005-S

Compact spectrophotometer designed for light transmittance measurement of coated and uncoated materials within the visible spectral range. Separate independent source and receiver units enable measurement of large size, framed and integrated objects such us windshields, solar cell cover glass, windows, cast glass. Typical 50x50mm sample glass plates typically measured in laboratory type spectrophotometers can be measured as well. The instrument is simple to operate and ideal for mobile use on-site. Calibrated filters are available with light transmittance values as specified in published standards, 70% light transmittance for ECE R43 for example. The filter standards are supplied with traceable calibration certification as required. Or simple 100% reference setting can be made without a light transmittance standard filter.

Using two diode array spectrometers one in source and one in receiver the quality of measurement and stability rival that of a dual-beam spectrophotometer. Another key feature is the LCRT-2005-S ability to simulate standard illumination A (recommended in ECE R43) or D65 day light illumination and photometric V(λ) responsivity through a spectral measurement method. Especially with colored glass, calculation using the spectral data is more accurate than straight measurement with filter corrected photometric detectors alone. Beside spectral transmittance within the total visible range, monochromatic transmittance at selected wavelengths can be measured. Spectral transmittance can be displayed in graph form.

For on-site mobile use the source is built with a rugged ODM98 coated integrating sphere and LED light sources. The alignment of source and receiver is simplified by an internal camera. Since pulsed light is used as the source signal measurements are made independent of ambient light. Up to 100 measurements can be stored in memory and read out via the USB interface later with the software supplied.

The LCRT-2005-S measurement geometry enables the measurement of light transmittance by placing the source directly on the sample (D/0). The absorption error caused by re-reflected light from the test sample back into the source is compensated by the source reference spectrometer. By enlarging the distance between source and sample the source illumination becomes increasingly parallel. In this 0/0 measurement geometry the regular part of light transmittance is measured. The difference between total transmittance and regular transmittance is the diffuse component. The unique function of the LCRT-2005-S, to adjust the sample illumination characteristic between diffuse and parallel, helps to increase the signal to noise ratio for scattered light (haze) measurement. The very narrow field-of-view of the receiver enables the measurement of real in-line transmittance used to specify the transparency of ceramics.

Complete description, specifications and ordering information for the LCRT-2005-S and accessories are provided in the PDF datasheet.

PDF LCRT-2005-S Spectrophotometer, light transmittance

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