LCRT-2005H-S

Light Transmission

Light transmission is the visually sensed light permeability of materials. It is particularly important when it comes to specification of window panes on all types of vehicles, display sheets and disks as well as all the other samples whose transmission is assessed with the photometric responsivity V(λ) of the human eye.

Light transmission is a relative measurement. It describes the signal difference of the measured luminance in a geometrically defined radiation beam path. The measurements are done both without a test sample (100%) and with a test sample. The light source of the measurement device is characterized by a spectrum that corresponds to the standard illuminant type A, C or D50. The spectral responsivity of the receiver matches that of the human eye. 

Description of the LCRT-2005H-S Measurement Device / Transmission Meter

The LCRT-2005H-S is elaborately designed for light transmission measurement of thin, scratched and clear samples. The d/0° measurement geometry comprises of an integrating sphere light source and a luminance measurement device. The monitor detector of the light source and that of the receiver are both equipped with a diode array spectrometer. The spectral measurement data enables precise simulation of the required standard source spectra and the photometric responsivity spectrum of the receiver. The sample is aligned in front of the light source for measurement. The degree of light transmission can thus be determined through diffuse sample illumination for thin scratched samples as well. A manually selected light trap is implemented for haze measurements. Multiple LEDs are used in order to cover a spectral range of 380 nm to 780 nm.

The integrating sphere light source is well guarded against shock and stains by its synthetic coating, LED lamps and the protective glass on the illumination field. In order to minimize any effects by ambient light, the measurement is performed using pulsed light. The device is also equipped with a camera to aid in alignment of the source and receiver for freehand measurements. The device can be powered using four AA batteries or via USB. A hard-top casing is also supplied for safe storage and transport of the device as well as its spare batteries and accessories.

Haze Measurement Device / Haze Meter

The LCRT-2005H-S incorporates a manually selected light trap that allows the measurement of haze according to ASTM D1003−13. The light trap installed allows precise measurements due to an innovative light trap design usable for mobile small devices like the LCRT-2005H-S. The meter supports the user during the measurement by intuitive display commands.

Usage as Spectrophotometer

The LCRT-2005H-S can also be used as a spectrophotometer due to its spectral measurement detectors implemented in source and receiver. The spectral range of the spectrophotometer is given between 380 nm and 780 nm.

Fast and Simple Freehand Measurements

One of the characteristic properties of the LCRT-2005H-S is its ability to easily perform a measurement in only a couple of seconds to minutes:

Transmission Measurement Procedure:

1) Connection of the source and receiver to the controller device
2) 100% adjustment measurement
3) Alignment to the test sample
4) Start of the measurement
5) Display of the measurement values

Haze Measurement Procedure:

1) Connection of the source and receiver to the controller device
2) 100% adjustment measurement with and without light trap
3) Alignment to the test sample
4) Start of the measurements (with and without light trap)
5) Display of the measurement values

USB Interface and Readout Software

The USB interface enables data readout and power supply. The software delivered with the device can be used for measurement data readout.

Traceable Measurements / Traceable Transmission Standards

Two transmission standards with 70% and 80% light transmittance are offered for device matching in applications where traceable measurement values are required.