Abstract: An optical transmission unit (3) transmits an optical signal having a light intensity set as a Low level component of a pulse. An optical partial reflector (6) is provided on a path through which transmission light is transmitted from a circulator (5) to the atmosphere, and reflects the optical signal. A detection unit (11) performs coherent detection on reception light using, as local light, a signal in a Low level section in the optical signal reflected by the optical partial reflector (6).

Abstract: An ultrasonic probe including: a plurality of transducers; a plurality of low-noise amplifier circuits individually corresponding to the plurality of transducers, the plurality of low-noise amplifier circuits having a variable resistor feedback unit making a resistance value variable by an electrical signal inputted to a control terminal; and a control circuit; wherein the control circuit has a dummy circuit generating a bias voltage of a feedback unit of the low-noise amplifier circuit, and an adding circuit outputting an added signal of a bias voltage by the dummy circuit and a control signal increasing or decreasing with a lapse of time; and the plurality of low-noise amplifier circuits input an output of the adding circuit to the control terminal of the variable resistor feedback unit to perform variable control on a gain of the low-noise amplifier circuit.

Abstract: A laser radar device calculates a wind speed for each of a plurality of divided sections obtained by dividing a trajectory drawn by a laser beam in front of a wind turbine.

Abstract: In a conventional laser radar device, there has been a problem that since a distance resolution is changed in advance depending on a measurement distance, it is necessary to perform measurement again after changing the distance resolution.

Abstract: A laser radar device calculates a wind speed for each of a plurality of divided sections obtained by dividing a trajectory drawn by a laser beam in front of a wind turbine.

Abstract: An optical transmission unit (3) transmits an optical signal having a light intensity set as a Low level component of a pulse. An optical partial reflector (6) is provided on a path through which transmission light is transmitted from a circulator (5) to the atmosphere, and reflects the optical signal. A detection unit (11) performs coherent detection on reception light using, as local light, a signal in a Low level section in the optical signal reflected by the optical partial reflector (6).

Abstract: A lidar apparatus includes a foreign matter detector detecting foreign matter hindering laser light and reflected light from passing through the light transmission window, based on at least one of the measurement success or failure result and the signal-to-noise ratio; a precipitation determiner determining whether precipitation, included in the foreign matter, exists on the external surface of the light transmission window based on a time elapsed since the latest wiper operation, when the foreign matter detector detects the foreign matter, and that the precipitation does not exist, when the foreign matter detector does not detect the foreign matter. When the precipitation determiner determines that precipitation exists, the wiper operation controller causes the wiper to operate and the washer fluid supplier not to operate.

Abstract: A lidar apparatus includes a foreign matter detector detecting foreign matter hindering laser light and reflected light from passing through the light transmission window, based on at least one of the measurement success or failure result and the signal-to-noise ratio; a precipitation determiner determining whether precipitation, included in the foreign matter, exists on the external surface of the light transmission window based on a time elapsed since the latest wiper operation, when the foreign matter detector detects the foreign matter, and that the precipitation does not exist, when the foreign matter detector does not detect the foreign matter. When the precipitation determiner determines that precipitation exists, the wiper operation controller causes the wiper to operate and the washer fluid supplier not to operate.