Gigahertz - Model LCRT-2005-S -Light Transmission Meter for Mobile and Stationary Use

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.

LCRT-2005-S spectrophotometer

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.

Traceable measurements

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

General
Short description    

Mobile measuring Instrument for light transmission.

Main features    

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.

Measurement range    

• 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

Typical applications    
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.

Calibration    

• Realative measurement methode with 100 % reference adjustment.
• Optional calibration with 70 % or 80 % calibration standards.  

Product
Measurement geometry    
D/0 geometry; measurement of the luminance ratio with a diffuse light source as per CIE 130 & DIN 5036.

Beam diameter    
6.6 mm at contact measurement

Light Source    
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.

Sensor    
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.

Spectral range    
425 nm to 705 nm

Measurement range    
5 % to 100 % transmission for a color-neutral transmission spectrum

Typical Measurement uncertainty    
± 1 % absolute

Data Resolution    
0.1 %

Calibration    
Relative measurements after performing 100% match against air.
Traceable measurements after matching with calibrated standard filters.

Source

Light Source    
White LEDs in pulse mode, usable wavelength range: 425 nm to 705 nm

Monitor detector    
array spectrometer based on a 256 pixel diode

Connector    
Length 1.5m
Mini DIN plug
RS232 and voltage supply

Housing    
Aluminium profile with plastic caps
Threaded bores for mounting

Dimensions    
160 mm x 45 (60) mm x 85 mm

Weight    
450 g

Light Source    
Integrating sphere with synthetic ODM98 coating. 20 mm illumination field diameter with homogenous luminance distribution (lambertian radiator). Illumination field equipped with a protective shield.

Receiver
Sensor    
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

Dimensions    
160 mm x 45 mm x 85 mm

Weight    
400 g

Controller
Source and receiver connector    
Two mini DIN plug connections

Display    
Monochromatic display with backlight that can be switched on/off

Parameter adjustment    
Menu operated
saving of the last used settings
four control buttons

Interface    
USB

Power Supply    
4 x AA batteries
alternative 4 x AA batteries with external charger
USB

Dimensions    
230 mm x 72 (115) mm x 35 (50) mm

Weight    
400 g

Miscellaneous
temperature range    
10 °C to 40 °C

Humidity    
Above the saturation temperature