The vendor is required to provide for the purchase of a dual camera high speed particle image velocimetry system.
- Camera and software:
• System has two cameras
• Monochrome sensor with at least 3.5 megapixels at 4 KHZ (e.g., 2500 x 1400 pixels)
• Available triggering via TTL from BNC cable with insertion delay of < 5 microseconds
• Timing resolution of better than 100 ns
• Straddle time (interframe time between two successive images for PIV), must be no more than 2 microseconds based on the 99% to 1% transition time for the first image and 1% to 99% turn on time for the second image assuming the %50 transmission point for first and second images occur at approximately the same time, i.e., with a 2-microsecond laser temporal spacing less than 1% of signal from the first image should bleed into the second image.
• Bit depth of or greater 12 for acquired images
• Quantum efficiency (QE) at 500-600 nm of 70% or greater
• Pixel size of less than 10 micron
• Built-in mechanical shutter
• Software for control of camera and data acquisition is included with camera
• Software allows for saving files in standard formats (or have tools for converting files) such as tiff
• Image files are in a format that can be read into processing software such as Matlab and python.
• Ability to store a minimum of 50 memory segments on camera
• Minimum of 32 GB of on camera internal ram
• BNC connections for triggering included on the camera itself or as a separate breakout box or cable.
• PIV software has an option for VIC# method for data assimilation at the time of purchase.
• The software and hardware can combine the existing low-speed, 10 HZ, laser with a high-speed camera being purchased without compromising the maximum sensor resolution.
• The software has state-of-the-art shake-the-box (STB) technique and yields a direct estimate of the total (material) derivative of velocity, i.e., rate of change of velocity in langrage frame of reference.
• The software has a distributed processing
• The software has GPU processing capability
• The software has a PIV uncertainty quantification for instantaneous velocity fields
• The software has the ability of propagation of PIV uncertainty into statistics and derived quantities interest.
• Cameras are 12-bit and have 10 gigabit ethernet download speeds
- Laser:
• Laser system is ND: YLF          
• Laser output at 527-529 nm          
• Repetition rates from single-shot to at least 10 KHZ for each oscillator/head (with external triggering)    
• Fully flexible external triggering of each oscillator/head via TTL (from zero delay between pulses to any arbitrary delay consistent with the repo rate)          
• Minimum pulse energy of 30 MJ/pulse for an individual oscillator/head (60 MJ/pulse for both heads) from single-shot to 1 KHZ at 532 or 527 nm          
• Average power of greater than or equal to 90 w at 3 KHZ repetition rate (both oscillators/heads
combined)          
• Pulse to pulse variation of less than 0.5% rms          
• Pulse width less than 180 ns at 1 KHZ          
• The high-speed laser has the ability to align the beam overlap of the two cavities through software
• Beam divergence less than 9.5 milliradians          
• Chiller included for laser cooling          
• User adjustable beam combining optics included for precise overlap of beams from the two oscillators and heads          
• Maximum beam diameter of 6 mm at the exit.          
• Beam m-squared value of 16 or lower          
• Laser has an optical attenuator to adjust the output via the software