X4

X4 Light Analyzer Bi-Technology Sensor

The X4 Light Analyzer measures photometric illuminance, radiometric irradiance and spectral irradiance in absolute light measurement units. Its Bi-Tech sensor technology includes both filter detectors and a spectrometer working together for lowest measurement uncertainty.

Integral Detectors 

The broadband filtered detectors match the CIE photopic, scotopic or radiometric UV-A, VISIBLE and NIR spectral sensitivities. The solid state photodiodes feature a wide dynamic measurement range with superior linearity.

Diode-Array Spectrometer 

The diode array spectrometer provides spectral data in the wavelength range from 315 to 1050nm. The relative spectral data is used for:

• on-line correction of the broadband detectors spectral mismatch uncertainty
• spectrum, peak wavelength, half-band width, peak wavelength intensity
• color temperature, xy and u’v’ chromaticity values, color rendering index

Accessory Components 

The X4’s capabilities can be extend for luminous/radiance intensity, luminous/radiant flux and luminous/radiant intenstity spatial distribution measurement using optional accessory components.

Software 

The supplied S-X4 software supports complete control of the X4 and any accessory equipment included with the system. This includes Gigahertz-Optik’s LED and Lamp Power Supplies (LPS), goniometer (GBD) and integrating spheres (IS). Different routines for data acquisition, several numerical and graphical displays for visualization and different export options (ASCII and Microsoft Excel) are available.

Electronics

The X4-DE electronics unit contains the diode array spectrometer and detector electronics. The X4-DE devices are remote controlled via USB interface.

Bi-Technology Sensor Design

The diode array spectrometer is a compact Czerny Turner design equipped with a 2048 pixel CCD array.A SMA fiber optic input with collimating, focusing mirror and diffraction grating enable low light level and high resolution light measurement. A flexible light guide with 1m length connects the diode array spectrometer to the X4-BTS or LDM-9812 detector head.The four channel broadband detector electronics consists of a high sensitivity analog amplifier with switchable gain over a 0.1pA to 200µA measurement range.

Bench-Top or Rack-Mount Housing

The X4-DE is available in two versions. The X4-DE-UN in its own bench-top housing is designed for stand-alone applications. The X4-DE-UN-RM is designed for installation into a 19” rack or bench-top housing where it can be combined with other electronic devices like LED power supplies to form one complete electronics unit.

PC or Laptop Operation

To operate the X4-DE and display results a laptop or PC with USB interface is needed. The X4-DE is powered through the USB interface (5VDC operating voltage).

S-X4 Software

The software supplied supports PC remote control operation of the X4-DE including its set-up, measurement routine, data displayed as well as documentation.

Traceable Calibration of Spectroradiometer

Calibration and certification is done by Gigahertz-Optik’s calibration laboratory for light measurement quantities against calibration standards traceable to national and international metrology laboratories.

Broadband Detectors for Absolute Measurements and Diode Array for Spectral Measurements

The X4-BTS light sensor contains a SMA fiber connector for the light guide of the diode array spectrometer and up to four X4-ID type broadband detectors. A shared diffuser window for cosine correction ensures uniform illumination of the light guide and each of the sensor.

Trouble Free Light Guide Exchange

The use of broadband detector mounting design in the sensor housing ensures absolute measurements independent of influences by the exchangeable light guide.

Diode Array Spectrometer

The X4-BTS sensor is connected by a SMA fiber optic cable to the X4-DE diode array spectrometer for spectral irradiance measurements.. The fiber is placed behind the cosine diffuser. Offset compensation for the diode array detector is performed using a manually operated shutter between the diffuser and the fiber. A manually operated OD2 neutral density filter increases the diode array dynamic range when measuring low and high signal level light sources. The switch positions of both shutter and attenuator are fed back to the X4-DE-UN.

Traceable Calibrations of Detectors

The X4-DE with X4-BTS is calibrated for photometric and radiometric sensitivity of the integral detector(s) and the absolute spectral sensitivity of the diode array spectrometer within the wavelength range from 315nm to 1050nm. Calibration is performed by Gigahertz-Optik’s calibration laboratory for light measurement quantities against calibration standards traceable to national and international metrology laboratories.

Optional Accessory Components

Optional components can be ordered for the X4-BTS detector to expand measurement capabilities:

• • Integrating spheres for luminous flux and radiant power measurements

• • Goniometric bench for luminous intensity spatial siatribution

• • Front tubes with LED adapters for CIE 127 Averaged LED Intensity measurements

• • Front lens adapter for luminance and radiance measurements

The sensor head with 45mm diameter and V-groove fits onto the available Gigahertz-Optik accessory parts with 45mm diameter detector mount.

X4-ID3 400-800nm Detector