OMS PSP/TSP Post-Processing Software

During PSP or TSP acquisition, images are captured at a reference condition (wind-off) and then at a loaded condition (wind-on).  Then the ratio of those images is done to compute the intensity ratio which is later converted to a useable quantity using a calibration.  Background images are taken with the LED excitation sources off to capture any ambient light the camera may see and then subtract that from the wind-on and wind-off images. 

Post processing software is needed to compute the ratio of the luminescent intensity of the paint at an unknown test condition, I, with the luminescent intensity of the paint at a known reference condition, Io.  Using this wind-on wind-off ratio, the response of the system is then modeled using a modification of the Stern-Volmer equation.

Stern Volmer

Taking the ratio of the two signals drops illumination spatial variation and temperature variation from the equation.  This is a requirement for most low-speed PSP applications and wind tunnels or facilities with large temperature changes during a run (i.e. blowdown wind tunnels).  Post-processing software also is used to apply corrections like image filters, pressure tap corrections, image alignment and meshing of 2D PSP/TSP images to a 3D mesh.  From this, loads data from models can be calculated and compared to CFD.



Product ID: OMS-Lite


ProAcquire controls the system during data acquisition and records the data in a format that is compatible with the OMS-Lite image analysis software. ProAcquire allows the user to manipulate camera settings, file management, and other parameters.

OMS-Lite is a simpler version of our OMS ProImage package. OMS-Lite supports GUI-based PSP/TSP data processing in an interactive mode. The data reduction procedure for PSP involves taking the ratio of wind-off / wind-on images and converting this image to pressure using a calibration that relates this ratio to pressure. In practice, several other image processing steps are often required. These steps can include compensating for the background lighting, image alignment, image filtering, in-situ calibration, temperature correction, and resection (transformation of 3-D model coordinates into 2-D image coordinates), all of which are supported by OMS-Lite. The main window of OMS-Lite is shown below. It allows the user to load the relevant wind-off and wind-on data files, and to access any of the image processing and calibration features.



User Interface Front Panel of OMS-Lite

The following images show a basic single-channel (single luminophore paint) dataset being processed. The dataset begins with the raw wind-on image. The background is then removed from the image, and then the image is filtered, then the wind-off/wind-on ratio is taken and converted to pressure.

Un-corrected Wind-on image    Corrected Wind-on image 

Background Removed

 Ratio Image (Wind-off/Wind-on) with low-pass filtering    Pressure image

   Low-pass Filter Applied then Converted to Pressure via a Calibration


OMS-Lite Datasheet.pdf

Software: OMS-Lite v1.2.3 

Lab Demonstration 1: PDF

Lab Demonstration 2: PDF

Lab Demonstration 3: PDF

Lab Demonstration 4: PDF


Product ID: OMS-30i

ProImage is a data processing software developed for higher-end users for experiments with multiple cameras and test conditions.  ProImage includes many image editing and data processing tools that the basic OMS-Lite does not.  A region of interest can be selected and cleaned up in ProImage to produce high-quality pressure or temperature fields. 


Pressure Over Surface of Delta Wing in ProImage

Many additional features are available in ProImage to clean up images.  Imperfections such as screw holes, markers, and paint imperfections can be removed from the field.


ProImage Datasheet.pdf

ProImage User Manual.pdf

ProImage Basic Tutorial.pdf

Software: OMS ProImage x86.exe

Software: OMS ProImage x64.exe 

For ordering information, please contact our sales department: or call us at (937) 630-3012 

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