Submitting Data

Submitting Data

LBNL is working on measurement procedures for different scattering products. After the publication of measurement procedure(s), an inter-laboratory comparison (ILC) will be conducted. The ILC is expected to be completed, and a full report published, within a year of its commencement. Upon completion of a successful ILC, with at least 1 commercial laboratory showing competence, commercial measurement of scattering systems will be approved.

Currently, LBNL is measuring optical properties of scattering products for number of different materials and product types. Please send your request with completed submission form. Please contact CGDB@lbl.gov for a quote, lead time, and shipping address of your samples.

The following are specific requirements for different product types.

Venetian Blind Slats

Venetian blinds (horizontal louvered shades) can be modeled according to ISO 15099 and also using matrix method (Klems 1994). These methods require optical properties of slat material under the followng assumptions:

  1. Ideally flat 3"x3" samples of the used material and color should be submitted but at least larger than 1" on the shortest side.
  2. The slat material is opaque.
  3. The perforation used to suspend the blinds can be ignored.
  4. Both front and back surface are diffuse (e.g. painted). Unfinished aluminum is typically too specular (mirror-like) to work with the model.
  5. The geometry has no more than a single curve (flat is fine, but no "S" or "W" like shapes).
  6. The slats are thin compared to the gap between the slats. Typical geometries are less than 1 mm thickness to a 15 mm gap between slats and that is fine.

Note: Experiment with the WINDOW 7 shade layer interface for Venetian blinds to see what geometries are possible and what information is required. If your product meets those requirements it can be included in the CGDB as a shade material and shade layer.

Shade Screens and Cellular Shades (Fabric Type Materials)

  1. The fabric is thin (i.e., less than 1 mm).
  2. The pattern scale should be no more than 2 mm or much larger than 25 mm.
  3. The material is effectively flat.
  4. If the product consists of more than 1 fabric, each fabric needs to be measured individually (e.g., for a cellular shade, front, back, and glue line could each be a separate fabric)
  5. If the fabric has different front and back properties, the front should be clearly marked. The front surface corresponds to the exterior surface, i.e. the surface seen from the outside of the window.

Perforated Screens

  1. The screen material is thin.
  2. The screen has a regular pattern of circles or rectangles.
  3. The unperforated material is homogeneous.
  4. The material is effectively flat.

Fritted Glass, Diffuse Laminate Interlayers, and Patterned Glass

These classes of products do not have a good pathway for measurement right now. The standard 150 mm integrating spheres have proven to be insufficient in several different inter-laboratory comparisons and it is well understood why. An NFRC task group is investigating the use of 270 mm spheres (and larger) as well as goniophotometers as alternatives.

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