Abstract: A visibility measurement device (10) comprising a camera (12) and a computing device (14) communicatively coupled to the camera and configured to: receive a first image from the camera; select a measurement feature in the first image, the measurement feature corresponding to a location within the field of view of the camera; measure an optical characteristic of the measurement feature to obtain a measured optical characteristic value for the location; and determine an ambient fog intensity value based on: the measured optical characteristic value; a reference optical characteristic value for the location; and a distance between the camera and the location, such that the ambient fog intensity value can be used to calculate the visibility in a direction between the camera and the location.

Abstract: Provided is a device for detecting precipitation conditions. In one aspect, the device includes a Yagi-Uda antenna tuned a resonant frequency and a signal generator coupled to the Yagi-Uda antenna by a transmission line, the signal generator being configured to output an excitation signal to the Yagi-Uda antenna to the Yadi-Uda antenna. The device also includes a processing system coupled to the Yagi-Uda antenna, the processing system being configured to measure the ability of the Yagi-Uda antenna to radiate a signal following excitation of the Yagi-Uda antenna by the excitation signal and, based on the measured ability of the Yagi-Uda antenna, to identify a precipitation or other meteorological condition.

Abstract: Provided is a device for detecting precipitation conditions. In one aspect, the device includes a Yagi-Uda antenna tuned a resonant frequency and a signal generator coupled to the Yagi-Uda antenna by a transmission line, the signal generator being configured to output an excitation signal to the Yagi-Uda antenna to the Yadi-Uda antenna. The device also includes a processing system coupled to the Yagi-Uda antenna, the processing system being configured to measure the ability of the Yagi-Uda antenna to radiate a signal following excitation of the Yagi-Uda antenna by the excitation signal and, based on the measured ability of the Yagi-Uda antenna, to identify a precipitation or other meteorological condition.