Abstract:
An integrated optical component coupled to a circuit board of an aerosol sensor is provided. The integrated optical component comprising a medium including a first, second plane, third plane, wherein the first plane is adjacent to a detection area, the second plane is positioned about a photosensor, and the third plane is opposite an angle formed by an intersection of the first and second plane. The integrated optical component further comprising a first lens configured on the first sidewall, the first lens configured to receive incident light from the detection area and focus the incident light onto a reflector through the medium, the reflector configured on the third sidewall, the reflector configured to reflect the incident light towards a second lens, and the second lens configured on the second sidewall, the second lens configured to receive the incident light from the reflector and focus the incident light to the photosensor.
Abstract:
The invention relates to a measuring device for determining a vegetation index value (REIP) of plants. The measuring device comprises a plurality of light emitting elements, each of which emits substantially monochromatic light at a predetermined wavelength, a light receiving element which receives light from the light emitting elements reflected by the plants and generates a signal indicating the respective intensity of the received light, and a control means which successively activates the light emitting elements in a cyclical sequence, determines the respective intensity of the reflected light based on the output signal of the light receiving element, and calculates the vegetation index value based on the determined intensities of the overall measurement cycle. According to the invention, a light frequency converter is provided as the light receiving element.
Abstract:
The photoacoustic device for measuring the quantity of at least one gas. The Helmholtz-type esonant container comprises at least two tubes closed at their ends and linked together, close to each of their respective ends, by capillary tubes of diameter lower than the diameter of the parallel tubes. Each of the two radiant laser energy sources is physically separated and adapted to supply an excitation energy to the gas in the container at a different emission wavelength. The modulation means modulates the excitation energy supplied by each laser energy source with a modulation frequency corresponding to the acoustic resonance frequency of the container. At least one acoustoelectric transducer disposed on one of the tubes detects the produced acoustic signals produced and supplies an electric signal representative of the gas concentration in the container.
Abstract:
The infrared detecting element has a first base plate that has a first front surface, a first back surface, a first recessed portion, and an infrared detecting section for detecting infrared rays provided in an area of the first front surface that opposes the first recessed portion; a second base plate that has a second front surface, a second back surface on the opposite side of the second front surface, and a second recessed portion provided in an area of the second back surface that faces the first recessed portion; and an adhesion film that bonds the first back surface and the second back surface, wherein a second outer peripheral portion where the second recessed portion intersects with the second back surface surrounds a first outer peripheral portion where the first recessed portion intersects with the first back surface.
Abstract:
The disclosure provides for a system and method for detecting a threat agent. A sample is illuminated to produce photons Raman scattered and emitted by the sample. The Raman scattered photons are collected using time-gated detection without collecting the emitted photons. A Raman spectroscopic data set is generated from said Raman scattered photons wherein said Raman spectroscopic data comprises at least one of a Raman spectrum and a Raman chemical image. The Raman spectroscopic data is assessed to thereby determine the presence or absence of a threat agent in the sample. The sample may be in a target area. The sample may be illuminated using a pulsed laser or an intensity modulated laser. The illumination source may be synchronized with a gating element that enables time-gated detection.
Abstract:
A Raman spectroscopy sensor integrated with an unmanned ground vehicle (UGV) includes a UGV having a robot arm and a camera mounted on the robot arm. A laser and telescope associated with a Raman sensor are mounted on the robot arm in such a way as to point in substantially the same direction in which the camera is pointed. A Raman spectral data acquisition and control module is mounted on the UGV and is configured to receive Raman spectral data from the telescope. A remote base station having a display and a data processing and analysis module is configured to receive data from the data acquisition and control module and to display for an operator images from the camera and information related to the Raman sensor. An autofocus system is preferably employed to automatically control telescope focus and thereby enable the Raman sensor to operate over a wide range, e.g., 0.5 m to 10 m.
Abstract:
A mixture of H.sub.2 O, CO.sub.2 and CO are measured in the same sample chamber by infrared radiation passing through the chamber and absorption filters passing a narrow band in their respective absorption curves to an infrared detector. Background radiation is zeroed by grounding the detector response when an opaque segment is disposed in the path. A reference filter detects drift which is automatically corrected.
Abstract:
Various embodiments are provided herein for a system and method for automatic monitoring of pavement condition. In at least some embodiments provided herein, there is provided a method for assessing a condition of a pavement segment, the method comprising: analyzing, using a trained machine learning model, an image of the pavement segment; generating, by the machine learning model, an output comprising one or more identified first pavement distresses in the pavement segment; analyzing accelerometer data associated with the pavement segment; based on the analyzing, determining one or more identified second pavement distresses in the pavement segment; and based on the one or more identified first and second pavement defects, determining pavement condition data associated with the pavement segment.
Abstract:
Disclosed herein are light diffuser devices comprising a sphere having at least two openings, a track, a light source, a cart, and one or more plates, and their methods of use. Also, disclosed here are light diffuser systems comprising a light diffuser device and a portable infrared gas analyzer.
Abstract:
A retroreflectivity measurement system comprises a light source arranged to project light across a traffic lane during a measurement run, the light being limited to a particular portion of the visible light spectrum. A camera is selectively sensitive to this light to provide first filtered images and separately selectively sensitive to light at a portion of the spectrum not including the particular portion to provide second filtered images. A controller obtains sequences of first and second filtered images during the measurement run, and identifies within the sequences of images an illuminated road marking; determines a first intensity of the marking from a first filtered image, and a further intensity of the marking from the second filtered images; estimates an ambient intensity of the marking, by applying a scaling factor to the further intensity; and determines a retroreflectivity of the marking as a function of the first and estimated ambient intensities.