Low Energy UV Integrating Radiometer

UVIRAD®(단종) [대체모델 : UVICURE PLUS-II and UV POWER PUCK-II for Low Power Version]

Features:

• Monitors UV energy at work surface
• No external connections required
• Instrument won't damage artworks, platen
• Easy to use
• Digital readout
• Battery powered low battery indicator
• Carrying case and charger

Operation and Application:

• Q.C. tool in manufacturing printed circuit boards, screens, color proofing, and most UV imaging situations
• Exposure machine intensity profiling
• Platen and artwork opacity measurements
• UV lamp evaluation
• Platen and artwork opacity measurements

Introduction

Exposure of ultraviolet sensitive materials requires controlled amounts of ultraviolet energy. Many variables, such as time, temperature, geometry, etc. combine to make the amount of UV energy delivered by an exposure machine vary. Visual observation is not a reliable way of determining UV intensity since UV cannot be seen by the unaided eye. Further, total energy delivered is a function of time of exposure as well as of intensity. As a result, obtaining and maintaining proper energy in a UV exposure machine is difficult. Conventional UV measurement practices make use of a UV sensor to measure UV intensity at the point of interest. In some cases, intensity is assumed to be constant with time while in other cases an electronic integrator, which provides total energy delivered during the exposure period, is connected to the sensor from an external location. In either case the UV sensor, because of its size and geometry, is inconvenient to use, may damage film or exposure machine components and requires external connections to provide a readout.

Measures Under Actual Working Conditions

ElT's UVIRAD, low energy UV integrating radiometer, provides a rapid, convenient means of measuring total UV energy striking a workpiece. A UV sensor, associated electronics and digital readout are combined and housed in a 3/8" thick, 5-1/4" diameter aluminum housing that can be placed under artwork platen and/or cover sheet while under full vacuum. Or it may be used on top of the exposure surface. UVIRAD provides the ability to determine the performance of an exposure machine as it occurs under actual operating conditions. A UV sensor is located on the top side of the instrument. All necessary electronic circuitry, including batteries, is located inside the housing. In most applications, UVIRAD is placed so that the UV light striking it is the same as that falling on the UV sensitive material being exposed. The items between the material and the lamp would include the Mylar platen, artwork and vacuum frame glass, and foreign material such as dust. They are included because they typically have substantial impact on the amount of UV striking the material. Thus, the UVIRAD is able to measure the actual UV reaching the work surface as opposed to what external UV sensors measure.

Easy To Use

In operation, the unit is turned on or reset by pushing a flush mounted button on the top surface. UVIRAD is then placed in the position where UV energy is to be measured. It measures UV during the exposure cycle and retains the value. Upon completion of an exposure cycle, UVIRAD is removed from the exposure machine and the value of total energy, in milliJoules/cm2 of UV, which fell on it is read on the digital display. Subsequent cycles are measured by resetting UVIRAD and replacing it in the measurement position. UVIRAD will accommodate intensities from l00µW/cm2 to 100mW/cm2, which covers most UV exposure intensities. The 4 digit, UV resistant display covers the energy range from 0 to 9999 milliJoules. A threshold circuit inhibits counts whenever intensity is below 100µW/cm2to prevent nuisance counting in room light. Calibration is recommended at 6 month intervals under normal circumstances. EIT maintains calibration and repair facilities and provides a turnaround time of approximately 10 working days.