Central Paving, LLC 7/9/2025 - Laserfiche WebLink

2025 FEDERAL OVERLAY, BROADWAY – CALIFORNIA ST TO 18TH ST SPECIAL PROVISIONS FEDERAL AID# STBGUL-2715(012); COE PW# 3841 SP-111 May 6, 2025 The Thermal Traffic Sensor shall not depend on any visible or invisible 1 (infrared) illumination or image intensifier to “see” i.e. produce images. The 2 Thermal Traffic Sensor shall be totally passive and not produce any energy or 3 emit light in any bandwidth. The Thermal Traffic Sensor shall allow the user 4 to clearly identify images in the total absence of light. 5 The Thermal Traffic Sensor shall utilize a Vanadium Oxide (VOx) uncooled 6 microbolometer sensor responding in the LWIR (Long Wave Infrared) spectral 7 range of 7 – 14 μm, which is beyond what is visible to the human eye. 8 The Thermal Traffic Sensor shall be based on Vanadium Oxide (VOx) 9 microbolometer detector technology and shall not be susceptible to 10 permanent damage after imaging the sun. This is in contrast to some 11 systems based on amorphous silicon detector technology, which can be 12 permanently damaged when viewing the sun or even reflections of the sun. 13 The Thermal Traffic Sensor shall not utilize shutters to prevent damage from 14 the sun, but rather the Thermal Traffic Sensor shall provide uninterrupted 15 video which shall be required for traffic and ITS installations. 16 The Thermal Traffic Sensor shall not utilize dynamic apertures to protect the 17 image sensor because these mechanisms reduce sensitivity for an extended 18 period of time, thus reducing the Thermal Traffic Sensors performance, which 19 shall not be acceptable for traffic installations. 20 The Thermal Traffic Sensor shall provide a thermal optics that automatically 21 adjust to background thermal changes, and therefore do not require re-22 adjustment and/or thermal refocusing. 23 The Thermal Traffic Sensor shall not be susceptible to “image blooming” 24 caused by bright lights as are image intensifiers and visible spectrum 25 cameras. 26 The Noise Equivalent Temperature Difference (NETD) is the measure of the 27 smallest object temperature that can be detected by the thermal image sensor 28 relative to the system noise. The measurement is usually quantified as an mK 29 value. This is the most common Figure of Merit of a thermal imaging system 30 and a true measurement of the thermal camera’s sensitivity. The Thermal 31 Traffic Camera image sensor shall provide a NETD of <50mK f/1.0 or lower. 32 The Thermal Traffic Sensor shall include Auto Digital Detail Enhancement 33 (Auto DDE) which is an advanced non-linear image processing algorithm. 34 The Auto DDE function is fully automatic and requires no input or adjustment 35 from the user. The Auto DDE shall enhance the image detail to match the 36 total dynamic range of the original image allowing details to be visible to the 37 user even in scenes with low or high thermal contrast. Auto DDE will increase 38 the probability of detection of low contrast images. These settings shall be 39 optimized for performance with Traffic Video Detection. 40