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Fujifilm UVScale

Visualizes UV light amount distribution by color density

Ultraviolet Light Amount Distribution Measurment Film

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Structure and How it works


One side of the base film has a UV light sensitive layer, with the opposite side having a white-colored layer. The light sensitive layer changes color according to the amount of UV light it receives so the amount of light distributed on the exposed surface is easily seen by observing a light senstive layer and white-colored layer are attached to the base. Since the color density of the white-colored layer corresponds to the amount of UV light received the light amount distribution on the light receiving surface can easily be investigated.


The color forming material in the microcapsules reacts to the UV light and changes color.

How to use

1. After cutting UVSCALE to the required shape (length), place it on the location that you want to measure.

2. Operate the equipment or device, and expose UVSCALE to UV light. *The side of UVSCALE with matt surface should be exposed.

3. The UVSCALE changes color in accordance with the amout of light.

4. After cutting UVSCALE to the required shape (length), place it on the location that you want to measure.

Reducing light Film

1. Mono sheet type (L)

For low levels of light, UVSCALE can be used alone.

2. Two sheet types (M/H)

For medium to high levels light, use UVSCALE M or H. These are two sheet types, where a reducing light film is placed over UVSCALE.

Standard Color Chart

[High pressure mercury lamp]

The following are color characteristics generated by a high-pressure mercury lamp. However, please note that these color characteristics are values generated by using FUJIFILM light source and devices, so there may be difference in color density for a given amount of light due to difference and variations in individual lamps or envirnoment.

  1. Each density is the value measured by FUJIFILM. It is not a warranty of density level.
  2. The amounts of UV-light are values using a 365nm UV illuminometer.
  3. The solid lines on the graph show the recommended measurement range. The broken lines represent values that are not as precise as the solid lines and should be used as a refernce only.
  4. Standard Color Samples show the density range for visual evaluation.

Touch Panels

Checking UV light distribution on a conveyer belt during the OCR attachment process

Challenges: 1

- An illuminometer requires measurements at a large number of points.
- It is not possible to check whether the UV light extends right to the edge of the conveyor belt.

Challenges: 2

- Cannot check for unevenness of UV exposure caused by multiple point light sources.


  • Unevenness of UV exposure and decreases in the amount of light can be checked by observing the intensity of the color.
  • Allows the height and position of UV lamps to be adjusted when equipment is installed.
  • Allows checking of the time for replacing lamps.

Checking UV light distribution between panels in the OCR attachment process


- It is not possible to check whether the areas below thecover glass decorative printing and touch panel metal lines are light
- Because the illuminometer will not fit into the space between panels, measurements cannot be made


  • By observing the intensity of color, allows checking of whether the whole surface between pannel is suitably exposed to uv light.

Spot Exposure


- Illuminometer cannot measure UV exposure coverage of diagonal rays.
- The extent and strength of UV exposure is not known.
- Measurements cannot be performed on curved surfaces.


  • Since decreases in the amount of UV light can be identified from the intensity of color, the presence of dirt on the lamp and the period for lamp replacement can be determined.
  • Allows the height and position of UV lamps to be adjusted when equipment is installed.

Food Packaging

Checking of UV exposure in UV sterilization of drink cartons

Challenges: 1

- Measurements cannot be taken of moving objects.
- It is difficult to measure the amount of light inside the drink cartons.


  • Coverage and strength of exposure can be determined from the intensity of color.
  • By attaching UVSCALE to a curved surface, the amount of light on a curved surface can be measured

Examples Application

Examples Application

Roll type 270 mm * 5 m
Sheet type 270 mm * 200 mm (5 sheets)
Light amount measurement range (mJ/cm2) 4 - 60 60- 700 700- 6,000
Thickness 0.1 mm 0.1 mm *2 0.1 mm *2
Classification Mono sheet type Two sheet type Two sheet type
  • Please note that these light amount measurement ranges are estimates using our own high pressure mercur y lamps, and that these ranges will var y depending on the type of lamp used as a light source and on the ambient environment.Light amount measurement range: For color density 0.30-0.75 in the standard color sample
  • Applies to wavelengths in the 200 to 420 nm range

Roll Type

Sheet Type

*Please note that the specifications and performance stated in this catalog may change without prior notice as a result of improvements. The diagrams used are schematic, and differ from those for actual measurements.