Schlieren Imaging
Schlieren Imaging is a technique that makes invisible flow elements, like gases, air, and other transparent media, visible. Recent advancements in high-speed imaging technology have greatly improved the image quality achievable through this method. Enhanced light sensitivity, faster frame rates, and specialized features have expanded the range of applications for this technique.
For a more comprehensive exploration of how Phantom cameras are used in schlieren imaging, you can download our free whitepaper, “High-Speed Imaging Uncovers the Invisible with Schlieren Imaging.”
Our Phantom Academy Transparent Flows Course offers detailed insights on how to improve your schlieren imaging techniques.
For further information, explore the Frequently Asked Schlieren Questions on the Vision Research website.
Why Use High-Speed Cameras for Schlieren Imaging?
Enhanced Visibility High-speed cameras allow researchers to capture and analyze detailed images of phenomena that are typically invisible. Phantom cameras, equipped with advanced CMOS sensors, support various frame rates, resolutions, and exposure times, enabling precise control over experimental settings. Certain Phantom models also feature on-camera data storage, allowing for extended recording sessions. These data management capabilities reduce downtime between experiments, optimizing lab efficiency while data is transferred.
Superior Data Quality The main objective of Schlieren is to capture high-quality data, which is why an elaborate mirror system is used. Phantom cameras contribute to data integrity by allowing operators to temporarily turn off the camera’s cooling fans, which helps prevent heat from the sensor from interfering with the schlieren field and compromising data quality.
Consistency is equally vital. Environmental factors, such as small temperature or air quality changes, can affect the data. Phantom cameras, with their robust data management features, allow for quick repetitions of high-speed events, minimizing the impact of these uncontrollable changes.
Improved Light Sensitivity Since schlieren imaging involves visualizing fast processes using a very small light source, sensitivity is key to obtaining clear images. Schlieren is naturally high-contrast, so the ability to adjust tonal curves is more important than having a wide dynamic range. By fine-tuning these tonal curves, researchers can control grey-levels and extract maximum detail from the images.
Both monochromatic and color sensors can be used for schlieren imaging, but mono sensors generally offer better light sensitivity. When choosing a Phantom camera, consider the type of data needed and select the sensor that will deliver optimal results.
Download the free whitepaper below.
