Main Features

• Small and light because it is a film
• Placeable anywhere (measurable even in the water)
• Convenient for multipoint measurements at the same time for it can be prepared in large numbers
• Amount of light quanta as well as amount of solar radiation is measurable
• Required size of film is obtained by cutting, so it is low cost per piece

Example of use

• Measurement of solar radiation amount at plantations of vegetable and fruit or forests
• Measurement of solar radiation at plant leaf surfaces
• Measurement of solar radiation in greenhouse or the like (a calibration curve in greenhouse required)
• Measurement of solar radiation at the surface or shadow of buildings
• Measurement of solar radiation on the surface of human bodies
• Measurement of water turbidity based on amount of solar radiation in water

Agricultural crops

Can be attached to plant leaves

in the forest

Photo courtesy: Dr. Akihiro Isoda, Faculty of Horticulture, Chiba University

Examples of using OptoLeaf （Papers）

• Evaluation of photosensitive films for light measurements in the fruiting zone of grapevine canopies
• Effect of early sowing on growth and yield of determinate and indeterminate soybean(Glycine max (L.) Merr.)cultivars in a cool region of northern Japan
• AUSTRALASIAN SOCIETY FOR PHYCOLOGY AND AQUATIC BOTANY
  OptoLeaf: Measure Photosynthetic Photon Flux Density using a Light Sensitive Film
• A method of measuring in the light environment of multiple storied stands－Acomparison of using color acetate film as a simple recording film for measuring integrated global solarradiation and illuminometers
• An estimation of the light environment under forest canopy by a simple recording film for measuring integrated global radiation - A relationship between fading of color acetate films and integrated PPFD
• The applicability of a color acetate film for estimating photosynthetic photon flux density in a forest understory
      Source: The Japanese Forest SocietyJournal of Forest Research　Vol.10 No.3 P.247 2005

Specification

Size: Roll of 35 mm (width) x 10 m (Cut it and use it)
Select an OptoLeaf type to be used depending on your operating environment (site, ambient temperature, etc.) and measurement period.

R-3D(Red-3Days)
Standard type (Measurement period as a guideline: 3 to 7 days)

Y-1W(Yellow-1Week)
Long-term measurement type (Measurement period as a guideline: 1 to 3 weeks)

O-1D(Orange-1Day)
Short-term measurement type (Measurement period as a guideline: 1 to 3 days)
※ This type is suitable for a place where the amount of solar radiation is low or a place (or time) where (when) color fading is too slow because of low ambient temperatures.

To obtain the OptoLeaf color fade degree, an instrument to measure the absorbance of OptoLeaf is necessary.

OptoLeaf color fade curve (calibration curve)

【approximate expression】（R-3D / Y-1W / O-1D）

• The integrated amount of solar radiation
• The integrated amount of light quanta

The provided OptoLeaf color fade curves (calibration curves) are based on the actually measured values in Tokyo and Chiba prefectures. Therefore, in some areas, there may be errors between the provided data and actual amount of solar radiation. If higher accuracy is required, it is recommended to create calibration curves at the point of use.