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AUTOVIDI™ SCREEN PHOTOMETER SYSTEM (Reflector Lamp Video Photometer)

LSI offers a unique CCD (Charge Coupled Device) camera-based AutoVidi™ Screen Photometer system specifically designed for near-instantaneous measurement of beam forming lighting devices.  This form a digital camera is the same type as used by astronomers for incredibly accurate and detailed light measurement in deep-space applications.

AutoVidi combines powerful hardware and software to form a high speed comprehensive measurement and analysis capability for laboratory and quality control applications.

Lighting Sciences' AutoVidi Screen Photometers rapidly measure light distribution patterns and verify product performance versus specifications.  Controlled by windows-based software, the AutoVidi Screen Photometer is easy to use and requires no special training.

Near-Instantaneous Testing

With this new form of photometer, the lamp to be tested is placed on its test stand, which aims its towards a screen.  The adjacent AutoVidi digitizes the light pattern on the screen to provide many thousand of sport readings to an on-line computer.  Using unique software and calibration routines, the digitized image allows automatic determination of the intensity distribution in candelas of the test lamp.  The light pattern is captures virtually instantaneously, without any movement of the lamp.

Quality Control

The AutoVidi Screen Photometer can be used in the laboratory or factory.  It save you time and money and ensures your lighting products are consistently produced with a high level of quality.  It reduces the reject rate of your products by quickly discovering any out-of-specification units.  Photometry is performed to any desired industry specifications.  Special user-defined tests can be performed, including the measurement of isocandela data.

How it Works

A Charge Coupled Device (CCD) video camera has been integrated into the system to provide the capability of capturing the calibrated photometric readings.  Unlike a film camera, the CCD camera incorporates a sensor which, in effect, consists of many thousands of individual photocells.  The LSI AutoVidi camera incorporates a 768 x 512 array of pixels for a total of roughly 400,000 measurement points in a single frame.  Optimum stability and high signal-to-noise ratio are provided by an internal scientific grade Peltier solid state cooling system.

NIST Traceable Accuracy

Each pixel is individually calibrated traceable to NIST.  This is achieved using a Goniometer calibrated standard light source (provided with the instrument) which illuminates the screen.  The calibration software captures the image and computes calibration data for every pixel.  These are stored and then applied in subsequent tests.  In this way, any variations in screen reflectance are canceled and direct NIST Traceability is provided. Recalibrations can be made any nay time in a few minutes.  Typical accuracy is better than +/-5%.

Instant Pass/Fail

A computer interface board captures the digitized readings form the camera.  system software can automatically set the test voltage (optional) and all electronic parameters.  Complete isocandela then can be displayed and output files can be built.  Alternatively the photometric results can be analyzed and compared to stored specifications.  A pass/fail determination may be displayed on the system's monitor with an identification f failure points.

Detailed specifications could be obtained upon request.