Based on WOSP-SUNBLOCK, the WOSP-NOLAB system can be used in glass factories to measure solar reflectance and transmittance (300 … 2500 nm) of large pieces of glass. Total measurement time is about 5 s.
The CODE software used for data acquisition can predict the technical performance data (color, g-value, solar R and T) of arbitrary final glazing products built with the just produced coated pane. All data (spectra, measured and predicted performance data) can be automatically exported to an external SQL database.
We have copied our tutorial videos to a second platform which is available in China. Click the following link:
WTheiss videos on alternative platform
A halogen light, 16 UV-LEDs and an integrating sphere have been combined with 2 spectrometers to the WOSP Sunblock system. It measures reflectance in the range 300 … 1050 nm, with the option to extend the NIR range up to 2500 nm.
The light sources inject radiation into a sphere (76 mm diameter). The intensity at the sphere wall as well as the intensity reflected by the sample are simultaneously recorded with 2 spectrometers. Signals recorded for a reference mirror and the sample are combined to compute the final reflectance of the sample.
The whole block can be mounted on a traverse or a robot arm – only electrical cables leave the system.
The rack mounted system shown above has been used to record some demonstration spectra discussed below. All spectra have been acquired in less than one second.
Since the final spectrum is based on ratios of spectra the absolute light source intensity cancels – this leads to very stable results. The spectra shown below have been recorded with a delay of more than half an hour:
The next set of spectra show reflectance spectra of float glass with SiN layers of different thickness:
The last demo set shows spectra of solar glass with AR coatings, applied on one side only and on both sides of the glass:
The format of Optoplex NGQ csv files has been changed and we had to modify our import routine to match the new structure of the files – the new procedure is active starting with object generation 4.68. This may eventually cause trouble if you are still working with the older format. Please tell us if that happens …
An error in the computation of carrier mobility for the extended Drude model has been removed. The new (hopefully correct) values are all smaller than the previously computed values.
Once youhave optimized the design of your coating product with respect to angular variation of color you have to check if it really performs as CODE predicts.
The prototype described in this section will do the job: You can record absolute reflectance and transmittance spectra in high quality for the range 8° to 85° of the angle of incidence. The 85° are possible only for thin samples, with thickness below 5 mm. You do not need a calibration mirror since the 100% reference measurement can be done with light source and detector facing directly opposite to each other.
WOSP-ART consists of a light source and a detector mounted on arms which can be rotated individually. Spectra are recorded for the wavelength range 380 … 1100 nm. Extensions to the UV (down to 280 nm) and the NIR (up to 2500 nm) are possible.
Measurements are performed using our CODE software which can export results to data files or external SQL databases.
Here is a video demonstrating the operation of WOSP-ART.
We have updated the documentation of the connectivity to external SQL databases. SCOUT and CODE can save configurations, materials and measured spectra as well as fit results. The required table structure is generated automatically.
Below is the link to the relevant section of the SCOUT manual:
The computation of the total solar heat gain coefficient (g-value) following the rules of standard ISO 52022-3 (2017) has been implemented. The procedure takes into account the temperature change of panes and gases due to absorption and re-emission of solar radiation. The absorbed solar power and the final temperature of each pane are side-results of the routine and are available in addition to the g-value.
This problem has been described in a previous post. The recommended installation of the Microsoft redistributable package does not seem to solve the problem in every case.
We have made the missing DLLs available on our website. You can download the files here and copy them to your SCOUT or CODE program folder directly, without executing any installation routine.
The relevant program folders are (very likely) c:\scout\ (in the case of SCOUT) or c:\code\ (for the CODE software).
On monitors with high dpi values (small pixel size) Windows 10 sometimes decides to scale text output on graphics pages. In this case main view graphics of SCOUT, CODE and BREIN may look ugly, like on low resolution screens.
If this happens on your computer you can right-click the program file (scout.exe, code.exe or brein.exe) and select ‘Properties’ (or ‘Options’) and then open the tab ‘compatibility’. Check the option ‘Disable display scaling on high DPI settings’ as shown below:
That should solve the problem.
Thanks to S. Eraslan for pointing out this solution!