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2025 FEDERAL OVERLAY, W MUKILTEO BLVD – GLENWOOD AVE TO DOGWOOD DR <br /> PAGE SP112 OF SP123 SPECIAL PROVISIONS <br />WORK ORDER #3842 April 15, 2025 FEDERAL AID# NHPP-2776(011) <br />emit light in any bandwidth. The Thermal Traffic Sensor shall allow the user 1 <br />to clearly identify images in the total absence of light. 2 <br />The Thermal Traffic Sensor shall utilize a Vanadium Oxide (VOx) uncooled 3 <br />microbolometer sensor responding in the LWIR (Long Wave Infrared) spectral 4 <br />range of 7 – 14 μm, which is beyond what is visible to the human eye. 5 <br />The Thermal Traffic Sensor shall be based on Vanadium Oxide (VOx) 6 <br />microbolometer detector technology and shall not be susceptible to 7 <br />permanent damage after imaging the sun. This is in contrast to some 8 <br />systems based on amorphous silicon detector technology, which can be 9 <br />permanently damaged when viewing the sun or even reflections of the sun. 10 <br />The Thermal Traffic Sensor shall not utilize shutters to prevent damage from 11 <br />the sun, but rather the Thermal Traffic Sensor shall provide uninterrupted 12 <br />video which shall be required for traffic and ITS installations. 13 <br />The Thermal Traffic Sensor shall not utilize dynamic apertures to protect the 14 <br />image sensor because these mechanisms reduce sensitivity for an extended 15 <br />period of time, thus reducing the Thermal Traffic Sensors performance, which 16 <br />shall not be acceptable for traffic installations. 17 <br />The Thermal Traffic Sensor shall provide a thermal optics that automatically 18 <br />adjust to background thermal changes, and therefore do not require re-19 <br />adjustment and/or thermal refocusing. 20 <br />The Thermal Traffic Sensor shall not be susceptible to “image blooming” 21 <br />caused by bright lights as are image intensifiers and visible spectrum 22 <br />cameras. 23 <br />The Noise Equivalent Temperature Difference (NETD) is the measure of the 24 <br />smallest object temperature that can be detected by the thermal image sensor 25 <br />relative to the system noise. The measurement is usually quantified as an mK 26 <br />value. This is the most common Figure of Merit of a thermal imaging system 27 <br />and a true measurement of the thermal camera’s sensitivity. The Thermal 28 <br />Traffic Camera image sensor shall provide a NETD of <50mK f/1.0 or lower. 29 <br /> The Thermal Traffic Sensor shall include Auto Digital Detail Enhancement 30 <br />(Auto DDE) which is an advanced non-linear image processing algorithm. 31 <br />The Auto DDE function is fully automatic and requires no input or adjustment 32 <br />from the user. The Auto DDE shall enhance the image detail to match the 33 <br />total dynamic range of the original image allowing details to be visible to the 34 <br />user even in scenes with low or high thermal contrast. Auto DDE will increase 35 <br />the probability of detection of low contrast images. These settings shall be 36 <br />optimized for performance with Traffic Video Detection. 37 <br /> The Thermal Traffic Sensor shall utilize Non-Uniformity Correction (NUC) 38 <br />which is a set of compensation factors for each pixel. NUC shall enable the 39 <br />following features and benefits: 40