A laser radar system for detecting objects transmits a laser beam which is frequency modulated by the motion of scanning mirrors, which scan the beam across an object to be imaged. The return beam, reflected by the object, is combined with the local oscillator beam, and the frequency difference is detected. This frequency difference is obtained by the Doppler induced frequency modulation which results from the motion of the scanning mirrors. A signal corresponding to this frequency difference may be provided to the x axis of an oscilloscope for displaying the image. The x and y axis outputs of the oscilloscope are supplied with signals used to control the scanning of the x and y-scanning mirrors, to synchronize display with the scanning of the object.
An apparatus for detecting the velocity information of an object comprises the irradiation optical system for performing the irradiation of beam to the predetermined position on an object to be measured; the photodetector for detecting the light from the irradiated object by the irradiation optical system, the velocity information being obtained by the detection; the detector for detecting the irradiating state for detecting the deviation of the irradiating position of the beam on the object to be measured; and the adjuster for adjusting the irradiating state of the beam on the object based on the detection result of the detector for detecting the irradiating state. With such constituents as above, the apparatus is capable of dealing with the fluctuation of the lightning to obtain a high-precision detection of the velocity information at a high speed.
Reducing blind spots of a laser radar observing wake turbulence is required for detecting efficiently the wake turbulence which appears behind the main wings of an aircraft and affects the flight of other aircraft. A first laser radar a and second laser radar each emit a laser beam from different positions. A signal processing device produces wake turbulence information based on the reception signal of the first and second laser radar. Further, the signal processing device specifies wake turbulence information for producing display data either by making a composite of wake turbulence information of two laser radar whose observation areas do not overlap each other or by selecting the larger value of wake turbulence information from two laser radars whose observation areas overlap each other and produces display data for indicating wake turbulence information on monitor display based on the specified wake turbulence information.
A fiber optic receiving antenna is provided that permits the reception of an incident electric field without re-radiating any portion of the incident power. The fiber optic receiving antenna includes a master oscillator for generating a reference signal and a fiber optic interferometer having first and second arms formed of respective optical fibers for receiving the reference signal. The respective electrooptic activity of the optical fibers that form the first and second arms differ such that the signals propagating along the first and second optical fibers will be modulated differently in response to an incident electric field. The fiber optic interferometer also includes a coupler for combining the signals that have propagated along the first and second arms and been differently modulated by the incident electric field. The fiber optic receiving antenna can also include a detector for receiving the combined signals and for generating a signal that is at least partially dependent upon the incident electric field. As such, a measure of the incident electric field can be determined by the fiber optic receiving antenna. However, the fiber optic receiving antenna does not generate any current and, therefore, does not re-radiate any portion of the incident power.
A system (24) for detecting an air disturbance in front of an aircraft (10) has a controller (26) that is coupled to an image detector (40). Image detector (40) generates an image signal corresponding to heated air in front of the aircraft (10). The air in front of the aircraft (10) is heated by direct high energy beams such as microwave beams (16, 18) from a respective microwave antenna (12, 14). By monitoring the image, the presence of an air disturbance may be determined. Position adjusters (30, 32) may be used to adjust the position of the beams (16, 18) by controlling the position of antennas (12, 14). The position of the beam is preferably maintained a predetermined distance (d) in front of the aircraft (10) so that an evasive maneuver may be performed.
At least a representative fraction of the peeled vegetables which have passed through a steam peeler, and abrasive peeler, or both, is presented to a video camera for inspection. The camera output is analyzed by a computer controller to determine the amount of peel remaining on the vegetable and displayed in a visual format to the operator. The controller provides information to the operator on peel fraction remaining so that the operator may manually adjust speed of brush rotation and auger speed or other parameters of the peeling apparatus, or automatically adjusts these parameters to maintain level of peel with varying vegetable attributes. More representative peel fraction data is obtained by analyzing only the central half of the vegetable image captured by the vision system.
