TRICOR's Models 823 Video Photometers

Overview

The Model 823 Video Photometer measures the absolute brightness of any size sample or scene and provides quantitative data in fL or cd/m2. The 823 employs a progressive scan non-interlaced IEEE 1394 "Firewire" camera to measure the performance of lamps, LEDs, backlit panels, control switches, etc. It also quantifies paint reflectance, hemi-spherical reflectance, micro pitting, mirror reflective haze, contrast, and other appearance characteristics.

The 823 generates a 1024 x 768 pixel image with a digitized 8 or 10 bit gray scale. It uses TRICOR's Eyeppearance® software, a Windows™ compatible PC-based software system, to provide analysis tools used to establish photometric levels for an image.

A user-friendly Windows™ interface offers many menu options for analyzing the acquired gray scale image; however, the real potential of Eyeppearance® is realized when a calibration transform file is loaded for the image. The calibration transform translates the relative gray levels into absolute radiometric levels. Pixel radiance levels and histogram distributions are given in photopic units.

Menu options, such as the Enhance option, provide a close coupling of the image data and the histogram distribution. The image is highlighted in green for a given section of the histogram. The user can use the mouse to quickly change the highlighted radiance levels in bandwidth and position on the histogram distribution. Also, false coloring can be applied to the bimage allowing the user to readily see those areas below, above, and within the user-specified tolerance band. Quantitative values associated with the highlighted area(s) are then displayed on the PC screen.

Another powerful feature of Eyeppearance® is its ability to define up to 254 regions of interest. Each region of interest may be any region as outlined by the user using the mouse. From this region an active subset can be selected, which establishes a new histogram distribution and limits image analysis to this active region only.

Specifications and Features

Type	CCD Progressive Scan IEEE 1394 "Firewire" video photometer with 16 user selectable shutter speeds.
Receptor	Silicon CCD filtered to closely match the CIE relative photopic luminosity response.
Calibration	System supplied with one set of calibration curves (one curve for each of the 16 shutter speeds at one lens f/stop).
Measurement Scales	Absolute: absolute luminance scale (fL or cd/m2) 10-bit image scale Digital: 8-bit image scale (256 gray levels) or (1024 gray levels)
Analysis Capabilities (partial listing)	Pixel interrogation and Contrast Calculation. CCF (Color Correction Factor) Real-time false coloring ROI (Region of Interest) selection.
Optical System	50-mm, f/1.3 lens standard (other lenses available).
Field of View	7° 12'H x 5° 24'V with standard lens.
Focusing Distance	1 m (3.3 ft) to infinity with standard lens and configuration.
Target Area	Minimum: as small as 1 image pixel [0.203 mm (0.008 inch) approx.] Maximum: dependent upon measuring distance and field of view with standard lens and configuration.
Luminance Units	cd/m2 or fL selectable; calibration values in memory automatically converted for user display.
Measurement Ranges	.01 to 999,999 fL; .034 to 999,999 cd/m2 Accuracy ±4% of measured value (Measuring conditions: subject: standard illuminant A; ambient temperature: 20° to 30° C (68° to 86° F)
Short-term Repeatability	±0.4% (Measuring subject: standard illuminant A)
Resultant Image	1024 x 768 x 8 bits resolution;1024 x 768 x 10 bits resolution
Pixel size	14 x 14 microns
Temperature Ranges	Operating: -5° to 45° C (23° to 109° F); relative humidity less than 85% at 32° C (90° F) Storage: -30° to 66° C (-19° to 134° F); with no condensation

System Components

• CCD Camera: 33H x 44 W x 116 L cm/(1.3 H x 1.7 W x 4.6 L inches) 250g (9 oz)
• Lens: 50-mm, f/1.3 lens
• Cables: 4.5 m long IEEE 1394 6P/6P
• Photopic Filter with one set of calibration curves
• Tabletop Tripod
• Eyeppearance® Software
• Reference Manual
• Personal Computer: Windows® 98, ME, NT, 2000, XP with IEEE 1394 Port

Options

• Measure luminance to MIL-P-7788E and SAE AS7788
• Additional Lenses
• Custom Chamber Custom Software
• Additional Calibration Curves
• Personal Computer

Sample Screenshots

Histogram Classification	Production Quick Buttons*
Profile Window*	3 Dimensional Contour Plot*
Typical Images	Locator Upgrade

*Options

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