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 measurement
Light transmission is a relative measurand. 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 must be characterized by a spectrum that corresponds to the standard illuminant type A, C or D50. The spectral responsivity of the receiver must match that of the human eye. These properties allow ECE R43 conform measurements.
LCRT-2005-S light transmission measurement device
The LCRT-2005-S is elaborately designed for light transmission measurement of thin, scratched and clear samples. The D/O 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 equipped with a diode array. The spectral measurement data enables precise simulation of the standard light 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.
The LCRT-2005-S can also be used as a spectrophotometer due to its spectral measurement detectors in source and receiver. The spectral range is between 425 and 705nm.
Measurement device for freehand measurements
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.
Fast and simple freehand measurements
One of the characteristic properties of the LCRT-2005-S is its ability to easily perform a quick measurement in only a couple of minutes:
1) Connection of the source and receiver to the controller device
2) 100% adjustment measurement
3) Alignment to the test sample
4) Automatic start of the measurement
5) Display of the measurement values
USB interface with readout software
The USB interface enables data readout and power supply. The software delivered with the device can be used for measurement data readout.
Two transmission standards with 70% and 80% light transmittance are offered for device matching in applications where traceable measurement values are required.
Mobile measuring Instrument for light transmission.
Spectral measuring method. Compact source and receiver. Build in camera for receiver to source alignment support. Controller with battery (four AA) or USB power operation. Puls modulated LED lamp for measurements in ambient light conditions.
Spectral range: 425 nm to 705 nm
Spectral resolution: 5 nm
Transmission range: 5 % to 100 %
Measurement beam diameter: 6.6 mm
Illumination: A, C, D65
Detection: Spectral Photometric, Spectral Radiometric
Measurement of the light lransmission of automotive and all other vehicles front and side windows. Measurement of the spectral transmission of thin films and thin plates.
Realative measurement methode with 100 % reference adjustment.
Optional calibration with 70 % or 80 % calibration standards.
D/0 geometry; measurement of the luminance ratio with a diffuse light source as per CIE 130 & DIN 5036.
6.6 mm at contact measurement
Integrating sphere light source with a 20 mm illumination field; LED lamps; diode array monitor detector.
Simulation of the standard illuminants type A, D65 and D50.
Diode array detector with radiance lens. Depolarizer for measurement of polarized samples. Simulation of photometric responsivity. Digital camera for aid in freehand setup of source and receiver.
425 nm to 705 nm
5 % to 100 % transmission for a color-neutral transmission spectrum
|typical Measurement uncertainty||
± 1 % absolute
Relative measurements after performing 100% match against air.
White LEDs in pulse mode, usable wavelength range: 425 nm to 705 nm
array spectrometer based on a 256 pixel diode
Mini DIN plug
RS232 and voltage supply
Aluminium profile with plastic caps
Threaded bores for mounting
160 mm x 45 (60) mm x 85 mm
Integrating sphere with synthetic ODM98 coating. 20 mm illumination field diameter with homogenous luminance distribution (lambertian radiator). Illumination field equipped with a protective shield.
256 pixel diode array spectrometer with an achromatically corrected lens. Implemented depolarizer for measurement of polarized samples.
|Measurement beam geometry||
Measurement field angle - 0.38 °
Sample alignment 0 °
illumination field diameter by contact measurement - 6.6 mm, in 1 m measurement distance 12.6 mm
160 mm x 45 mm x 85 mm
|Source and receiver connector||
Two mini DIN plug connections
Monochromatic display with backlight that can be switched on/off
saving of the last used settings
four control buttons
4 x AA batteries
alternative 4 x AA batteries with external charger
230 mm x 72 (115) mm x 35 (50) mm
10 °C to 40 °C
Above the saturation temperature
|LCRT-2005-S||LCRT-2005-S Brochure and applications|
|Produktname||Product Image||Description||Show product|
|B2S-40-TRTH||Rail-bench to extend the LCRT-2005-S use to evaluate thin samples transmission by diffuse and regular illumination.
Features: stable 1m length rail bench with stand for source and receiver. Carriage with sample holder.
|PMS-RIT||Stand to extend the LCRT-2005-S use to measure the regular (in-line) transmission of thick samples up to 100mm thickness.
Features: stable stand with mount for source and receiver. Sample table.