Ambient Light Measurement
Phorad Meter
Display Measurement
SMPTE RP133-1991

Spectra PhoRad Photometer

 Control the Lighting Condition Under Which Radiographs and Images are 

Viewed and Interpreted

 
New Phorad=

Ambient
============================

Ambient Light Measurement
Spectra  PhoRad  Illuminance Photometer (lux & fc) Model No. SC-800
Luminance
measures cd/m2 & Lux 
Model No. SC-820
 
Luminance  Measurement
Spectra  PhoRad Luminance Photometer 
measures cd/m2 
Model No. SC-810 &  SC-810-A

INTRODUCTION

The New Spectra PhoRad Photometer is exclusively designed for Radiologist and Radiographers for NDT/QA application and is well known for its precision, accuracy, and repeatability.

Spectra PhoRad Photometers are essential for quality assurance of medical imaging at Diagnostic Imaging departments in hospitals and clinics. PhoRad is very easy to use and most cost effective photometer in the industry.

This innovative, hand-held radiographic optical instrument is a completely portable, battery powered auto ranging photometer designed specifically to measure light intensity of medical diagnostic imaging displays, film viewing boxes, image monitors, collimator light field and etc.  Photometer reads directly in candelas per  meter squared (cd/m2) and nits as set forth in the new standards outlined in the  Standard Practice for Radiographic Examination (ASTM E-1742-08).

Also to optimize image contrast, it also measures the viewing room ambient background illumination falling on the viewer surface as set forth in the new standards.


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Diagnostic Imaging Background

Diagnostic Imaging (Radiology) Accuracy and reliability of diagnosis in hospitals and doctors clinics greatly depend upon the conditions under which radiographs and images are viewed. These conditions include the luminance levels in candelas per meter squared (cd/m2) of the display devices (viewing boxes, image workstation monitors, image intensifier monitors) as well as the ambient room illumination (the amount of light falling on the viewing surfaces) in lux.

In an effort to reduce the rate of misdiagnosis (estimated to be as high as 30% by a number of research studies), the Federal Drug Administration, American College of Radiology (ACR), the American Cancer Society and the European community of radiologists have all adopted guidelines and standards for viewing lighting levels.

In order to improve the quality of image interpretation and to reduce the chance of misdiagnosis. Spectra Cine is introducing this New Spectra PhoRad  Photometer and it could easily provide radiology departments with a hand-held photometer that measures both display device luminance and ambient light (illuminance).

Spectra PhoRad Photometer measures light output of illuminator to ensure that user is in compliance with ASTM E-1742-08 and ACR-recommended light levels. Readings are in nits or candelas per meter squared (cd/m2) or foot Lamberts (fl). A second Cosine Corrected Diffuser to measure the Ambient light in lux (lx) or foot-candles (fc). This instrument is essential for quality assurance of medical imaging at Diagnostic Imaging departments in hospitals and clinics.

 

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Preliminary Specifications

Phorad Combo

Spectra PhoRad System 

Luminance & Ambient measurement

 Model No.SC-820  

  • Type: Spectra PhoRad Photometer System is a completely portable hand-held, battery powered auto ranging photometer for measuring luminance intensity in candelas per meter squared (cd/m2) with the Luminance Probe and ambient light in lux (lx) with the cosine corrected Photodisc.
     

  • Light Sensor: Ultra-stable silicon photodiode, together with computer selected glass filters to match the spectral response of the human eye (the CIE 1931 photopic response function) V (λ) filter.
     Photopic Curve

  • MEASURING Principle: Contact measurement with the  Luminance Probe placed directly on the surface to be measured.

  • MEASURING CAPABILITY: Measures luminance  level in candelas per meter squared (cd/m2) and ambient light in lux 

  • Luminance Range: 1 - 100,000,  cd/m2

  • Illumianance Range: Ambient range 1 - 100,000, Lux (lx)

  • Cosine Response: Cosine response of the meter with Cosine Corrected Photodisc is 2%

Cosine Response

  • RESOLUTION: 1 to 999  in 1 cd/m2 / Lux  increments; 1,000 to 99,990 in 10  increments
     

  • ACCURACY: Incandescent light source (CIE Illuminant A) ±2.5% of the measured value., Additional error when measuring non-blackbody sources ±3%. 

  • Repeatability: ±0.2%
     

  • Calibration: Calibration is traceable to the National Institute of Standard Technology (NIST), Washington D.C. Certified for one year.

  • Lamp: Electroluminescent lamp for backlit display
     

  • POWER SOURCE: One 6 volt battery #A544, PX28L, PX28
     

  • DIMENSIONS: 5½" x 2½" x 2"
     

  • WEIGHT: Approximately 8 ounces
     

  • Warranty: One year limited warranty.
     

  • Spectra PhoRad system is supplied with:
    Phorad Photometer, luminance probe (luminance measurement), photodisc- cosine corrected diffuser (ambient measurement), attractive, sturdy foam-lined protective carrying case with space for accessories, Instruction Manual, NIST Traceable Calibration (certified for one year) and Battery

  • In the Box

  • manufactured in United States of America

Complies with Standard Practice for Radiographic Examination ASTM E-1742-08 Specifications.

* Operating Temperature Range: 32˚F to 130˚F (0˚C to 55˚C).
* SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE.


 

Preliminary Specifications

Spectra PhoRad illuminance  photometer

Model No. SC-800

  • Type: Spectra PhoRad Illuminance Photometer is a completely portable hand-held, battery powered auto ranging photometer for measuring ambient light in lux (lx) with the cosine corrected photodisc.

  • Photopic Response: Ultra-stable silicon photodiode, together with computer selected glass filters to match the spectral response of the human eye (the CIE 1931 photopic response function) V (λ) filter.

  •  .Photopic Curve 

    • Cosine Response: Cosine corrected response of the meter.

    Cosine Response
    • MEASURING CAPABILITY: Measures illuminance level in foot-candles (fc) and lux (lx).

    • Illuminance range: 1 to 100,000 lx;  0.1 to 70,000 fc
       

    • RESOLUTION: 0.1 to 49.9 in  0.1 increments; 50 to 999 1 increments; 1,000 to,99,990 in 10 increments.
       

    • ACCURACY: Incandescent light source (CIE Illuminant A) 2.5% of the measured value. Additional error when measuring non-blackbody sources 3%. 
       

    • Repeatability: 0.2%

    • Calibration: Calibration is traceable to the National Institute of Standard Technology (NIST), Washington D.C. Certified for one year.
       

    • Additional Functions: Memory Store and Recall.
       

    • Lamp: Electroluminescent lamp for backlit display
       

    • Power CONSUMPTION: Operating 5.00mA/ reading. Data Retention 5uA.
       

    • POWER SOURCE: One 6 volt battery #A544, PX28L, PX28
       

    • DIMENSIONS: 5" x 2" x 2"
       

    • WEIGHT: Approximately 6 ounces
       

    • Warranty: One year limited warranty.
       

    • Spectra PhoRad system is are supplied with
      Phorad Photometer, luminance probe (luminance measurement), photodisc- cosine corrected diffuser (ambient measurement), attractive, sturdy foam-lined protective carrying case with space for accessories, Instruction Manual, NIST traceable calibration and Certification and Battery
       

    • manufactured in United States of America

    Complies with Standard Practice for Radiographic Examination ASTM E-1742-08 Specifications.

    * Operating Temperature Range: 32˚F to 130˚F (0˚C to 55˚C).
    * SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE.

     

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    Preliminary Specifications

    Spectra PhoRad luminance Photometer

     Model No.SC-810 & SC-810-A

    • Type: Spectra PhoRad Photometer System Model # SC 810 & SC 810 A are  completely portable hand-held, battery powered auto ranging photometers for measuring luminance intensity in candelas per meter squared (cd/m2) with the Luminance Probe. 

    • Light Sensor: Ultra-stable silicon photodiode, together with computer selected glass filters to match the spectral response of the human eye (the CIE 1931 photopic response function) V (λ) filter. 

    Photopic Curve


     

    • measuring Sensor: Aperture 19 mm Measuring  surface 6.25 x 6.25 mm.
       

    • MEASURING Principle: Contact measurement with the  Luminance Probe placed directly on the surface to be measured.

    • MEASURING CAPABILITY: Measures luminance level in candelas per meter squared (cd/m2) or foot-lamberts (fl).

    • Luminance Range: 1 - 100,000,  *2X attenuator extends upper range to 199,980 (*with Model SC-810-A) cd/m2
       

    • RESOLUTION: 1 to 999  in 1 cd/m2  increments; 1,000 to 99,990 in 10  increments
       

    • ACCURACY: Incandescent light source (CIE Illuminant A) 2.5% of the measured value., Additional error when measuring non-blackbody sources 3%. 

    • Repeatability: 0.2%

    • Calibration: Calibration is traceable to the National Institute of Standard Technology (NIST), Washington D.C. Certified for one year.

    • Lamp: Electroluminescent lamp for backlit display
       

    • Power CONSUMPTION: Operating 5.00mA/ reading. Data Retention 5uA.
       

    • POWER SOURCE: One 6 volt battery #A544, PX28L, PX28
       

    • DIMENSIONS: 5" x 2" x 2"
       

    • WEIGHT: Approximately 6 ounces
       

    • Warranty: One year limited warranty.
       

    • Spectra  PhoRad meters are supplied with
      Supplied in attractive, sturdy foam-lined protective carrying case with space for accessories, Instruction Manual, NIST traceable calibration and Certification and Battery
       

    • manufactured in United States of America

    Complies with Standard Practice for Radiographic Examination ASTM E-1742-08 Specifications.

    * Operating Temperature Range: 32˚F to 130˚F (0˚C to 55˚C).
    * SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE.

     

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