I Can an Aspheric Lens Narrow the FOV for Motion Detection Systems?

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An aspheric lens can potentially narrow the field of view (FOV) for motion detection systems, but specific dimensions and design considerations are crucial. Users are exploring alternatives like blocking pieces to achieve a narrower FOV, suggesting practical solutions beyond just lens selection. The discussion emphasizes the need for more details, such as dimensions and sketches, to provide tailored advice. The challenge lies in finding a suitable lens that meets the desired specifications of around 20 degrees FOV. Overall, the conversation centers on optimizing lens choice and design for effective motion detection.
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Curious if fresnel lenses are needed for motion detection.
I want to build a motion detection system, however I want to narrow field of view. I cannot find a Fresnel lens with a narrower FOV than 30 degrees. Was looking for something around 20 degrees.

Can I use an aspheric lens to achieve this, does anyone know?
 
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You just want to narrow your FOV with a pre-lens? What dimensions? Can you not just use some blocking pieces to narrow the FOV? More details and a sketch would be helpful. Thanks.
 
Thread 'Simple math model for a Particle Image Velocimetry system'

Thread 'Simple math model for a Particle Image Velocimetry system'

Hello togehter, I am new to this forum and hope this post followed all the guidelines here (I tried to summarized my issue as clean as possible, two pictures are attached). I would appreciate every help: I am doing research on a Particle Image Velocimetry (PIV) system. For this I want to set a simple math model for the system. I hope you can help me out. Regarding this I have 2 main Questions. 1. I am trying to find a math model which is describing what is happening in a simple Particle...
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