Patent application number | Description | Published |
20090145232 | ULTRASONIC MEASURING APPARATUS AND ULTRASONIC MEASURING METHOD - An ultrasonic measuring method includes the steps of: receiving ultrasonic waves, which have been transmitted by a spread spectrum technique using mutually different codes, at first and second receivers, thereby generating first and second received signals, respectively; generating interference signals, of which the amplitudes are equal to or greater than respective threshold values, from the first and second received signals that have been despread with a code that has been used to spread any of the ultrasonic waves other than a desired one; removing the spread interference signals from the first and second received signals; calculating maximum correlation values between the first and second despread received signals for the respective threshold values; selecting one of the threshold values, at which the greatest one of the maximum correlation values has been obtained, as a threshold value for canceling interference; and calculating the propagation distance or propagation azimuth of the desired ultrasonic wave by the amount of time it has taken for the first and second received signals to arrive. | 06-11-2009 |
20090197739 | Passive-Type Exercising Device and its Control Device - A passive-type exercising device and its control device are provided in which accuracy of deriving exercise intensity is improved. The passive-type exercising device includes an exercise assistance mechanism for assisting exercise of a user; a load setting value acquisition unit | 08-06-2009 |
20100049452 | ULTRASONIC MEASURING DEVICE AND ULTRASONIC MEASURING METHOD - An ultrasonic measurement method, including: receiving a plurality of ultrasonic waves that have been spectrum-spread with different codes by first and second wave-receivers; de-spreading the first and second receive signals respectively with a selected code and a non-selected code; obtaining an amplitude ratio between the produced selected de-spread signal and the non-selected de-spread signal; determining a threshold value based on the amplitude ratio; extracting a signal having an amplitude greater than or equal to the threshold value from the non-selected de-spread signal to thereby produce an interfering signal; spreading the interfering signal with a corresponding non-selected code and then removing the interfering signal from the first and second receive signals to thereby produce first and second receive signals from which the interfering signal has been removed; de-spreading the first and second receive signals from which the interfering signal has been removed each with the selected code to thereby obtain first and second de-spread signals from which the interfering signal has been removed; and calculating the propagation distance and the propagation direction of the selected ultrasonic wave based on points in time at which the first and second de-spread signals arrive at the first and second wave-receivers. | 02-25-2010 |
20100180693 | ULTRASONIC RECEIVER - An ultrasonic receiver according to the present invention includes: a wave propagating portion | 07-22-2010 |
20110123199 | OPTICAL ULTRASONIC MICROPHONE - An optical ultrasonic microphone includes an acoustic waveguide that transmits a sound wave received from an opening, an optical acoustic propagation medium that forms at least one portion of a wall face of the acoustic waveguide and an LDV head, and a sound wave proceeding through the acoustic waveguide is received by the optical acoustic propagation medium so that a change in the refractive index caused by the proceeding sound wave inside the optical acoustic propagation medium is generated with high efficiency, and by detecting this as an optical modulation by the LDV head, the optical ultrasonic microphone is allowed to have a very wide band. | 05-26-2011 |
20120055250 | ULTRASONIC MEASURING METHOD AND ULTRASONIC MEASURING APPARATUS - An ultrasonic measuring method includes: (A) receiving a coded spread spectrum ultrasonic signal in at least two receivers, and generating at least two received signals; (B) performing an quadrature detection on the received signals using the carrier frequency, and producing I and Q components of the received signals; (C) performing phase difference processing on the I and Q components with a coding period synchronized with that of the carrier frequency, and obtaining I′ and Q′ components from which a phase shift caused by a Doppler shift has been canceled; (D) despreading the I′ and Q′ components signals using different codes at time intervals synchronized with the carrier frequency, and obtaining despread I″ and Q″ components; (E) computing the amplitude and phase information based on the I″ and Q″ components; and (F) calculating the propagation distance and/or orientation of the ultrasonic wave based on the amplitude and phase information. | 03-08-2012 |
20120075637 | OPTOACOUSTIC CONVOLVER - An optoacoustic convolver includes: a light source; a first acoustic waveguide filled with a light-transmissive first acoustic medium; a second acoustic waveguide filled with a light-transmissive second acoustic medium; an optical system whereby light emitted from the light source is split into a first light beam and a second light beam, the first light beam entering the first acoustic waveguide, and the second light beam entering the second acoustic waveguide, thereby generating interference light between the first light beam having passed through the first acoustic waveguide and the second light beam having passed through the second acoustic waveguide; a light-receiving section for receiving the interference light and outputting an electric signal based on an intensity of the received light; and a correlation determination section for determining whether the received signal is correlated with the reference signal by observing the electric signal output from the light-receiving section. | 03-29-2012 |
20120204649 | OPTICAL MICROPHONE - There is provided an optical microphone for detecting an acoustic wave propagating in an ambient fluid, the optical microphone including: a propagation medium section; a light source for emitting a light wave to be transmitted through a diffraction region in the propagation medium section; and a photoelectric conversion section for detecting the light wave having been transmitted through the propagation medium section. A first acoustic wave which is a portion of the acoustic wave and a second acoustic wave which is another portion thereof are allowed to propagate in the propagation medium section so as to simultaneously arrive at the diffraction region, and an interference component between a +1 | 08-16-2012 |
20120321110 | POROUS SILICA MATERIAL AND OPTICAL MICROPHONE USING THE SAME - A porous silica material in which silica particles are connected to one another three-dimensionally, wherein: the porous silica material includes a through hole including first pores smaller than a mean free path of an air, and second pores larger than the first pores; the porous silica material has a density of 100 kg/m | 12-20-2012 |
20130142519 | OPTICAL MICROPHONE - An optical microphone includes: a propagation medium portion; a light source to output a light wave passing through the propagation medium portion across the acoustic wave propagating through the propagation medium portion; a reflecting section to retroreflect the light wave having passed through the propagation medium portion; and a photoelectric conversion section to receive the light wave having been reflected by the reflecting section and passed through the propagation medium portion to output an electric signal. 0 | 06-06-2013 |
20130230329 | OPTICAL MICROPHONE - An optical microphone includes: a light source; a first polarizer for allowing linearly-polarized light, of light output from the light source, to pass therethrough; a second polarizer for allowing linearly-polarized light having a different polarization plane from the first polarizer to pass therethrough; a sound-receiving section including an acoustic medium having a smaller sound velocity than the air, wherein an acoustic signal propagates through the acoustic medium, the sound-receiving section being arranged so that the linearly-polarized light from the first polarizer passes through the acoustic medium and enters the second polarizer; and a photodetector for converting an intensity of light having passed through the second polarizer to an electric signal, wherein between the first polarizer and the second polarizer, the linearly-polarized light having passed through the first polarizer is given different phase shifts in two orthogonal directions which are each different from a polarization direction. | 09-05-2013 |
20130301114 | ACOUSTO-OPTIC IMAGING DEVICE - An acousto-optic imaging device disclosed in the present application includes: an acoustic wave source; an acoustic lens system for converting a scattered wave produced by irradiation of an object with an acoustic wave emitted from the acoustic wave source into a predetermined converged state; an acousto-optic medium section which is arranged such that a scattered wave transmitted through the acoustic lens system is incident on the acousto-optic medium section; a light source for emitting a light beam which is formed by a plurality of superposed monochromatic light rays traveling in different directions; an image formation lens system for condensing diffracted light of a plurality of the monochromatic plane wave light rays produced at the acousto-optic medium section; and an image receiving section for detecting light condensed by the image formation lens system to output an electric signal. | 11-14-2013 |
20130308957 | OPTICAL MICROPHONE - An optical microphone includes: an acousto-optic medium section having a pair of principal surfaces and at least one lateral surface provided therebetween; a restraint section which is in contact with the at least one lateral surface for preventing a shape change of the acousto-optic medium section; and a light emitting section for emitting a light wave so as to propagate through the acousto-optic medium section between the pair of principal surfaces. The pair of principal surfaces are in contact with an environmental fluid through which an acoustic wave to be detected is propagating and are capable of freely vibrating, and an optical path length variation of a light wave propagating through the acousto-optic medium section, which is caused by the acoustic wave that comes into the acousto-optic medium section from at least one of the pair of principal surfaces and propagates through the acousto-optic medium section, is detected. | 11-21-2013 |
20130330262 | METHOD FOR PRODUCING POROUS SILICA MATERIAL - A method of producing a porous silica material includes: preparing a raw material solution containing silicon alkoxides including diisobutyldimethoxysilane and tetramethoxysilane in such a mass ratio that a mass of the diisobutyldimethoxysilane is 0.25 or more and 1 or less per mass of the tetramethoxysilane, and a solvent; obtaining a wet gel by adding, to the raw material solution, an aqueous solution containing a catalyst for promoting hydrolysis and condensation polymerization of the silicon alkoxides, the aqueous solution having a pH of 8.9 or more and 11.3 or less; washing the wet gel; and drying the washed wet gel under supercritical conditions. | 12-12-2013 |
20140007688 | ACOUSTO-OPTIC IMAGING SYSTEM, AND ACOUSTO-OPTIC IMAGING APPARATUS - An acousto-optic imaging system includes: an ultrasonic wave source for irradiating an imaged object with an ultrasonic wave; an acoustic lens for converting a scattered wave of the ultrasonic wave to a plane wave; a light-transmitting acoustic medium provided in an area on an opposite side of the imaged object with respect to the acoustic lens; a light source for outputting a monochromatic light plane wave; an image-forming lens arranged so as to condense diffraction light of the monochromatic light plane wave which is produced in the light-transmitting acoustic medium; an image-receiving section for obtaining an optical image formed by the image-forming lens; and a distortion compensation section for correcting a distortion of the optical image or a distortion. | 01-09-2014 |
20140050489 | OPTICAL MICROPHONE - An optical microphone for detecting an acoustic wave propagating through an environmental fluid by using a light wave, includes: an acoustic wave receiving section having a propagation medium portion through which an acoustic wave propagate and a first support portion for supporting the propagation medium portion; a light source for outputting a light wave so that the light wave passes through the propagation medium portion across the acoustic wave propagating through the propagation medium portion; a light-blocking portion having an edge line for splitting the light wave having passed through the propagation medium portion into a blocked portion and a non-blocked portion; and a photoelectric conversion section for receiving a portion of the light wave having passed through the propagation medium portion which has not been blocked by the light-blocking portion to output an electric signal. | 02-20-2014 |
20140056590 | POROUS SILICA MATERIAL AND OPTICAL MICROPHONE - A porous silica material disclosed in the present application is a porous silica material in which a plurality of silica particles are connected to one another three-dimensionally, wherein: a density of the porous silica material is less than 220 kg/m | 02-27-2014 |
20140104615 | DEVICE FOR DETECTING FLUCTUATION IN MOISTURE CONTENT, METHOD FOR DETECTING FLUCTUATION IN MOISTURE CONTENT, VACUUM GAUGE, AND METHOD FOR DETECTING FLUCTUATION IN VACUUM DEGREE - A moisture content fluctuation detection device including: a silica aerogel placed, disposed to a measurement object space; and a detection unit configured to detect fluctuation in moisture content within the measurement object space, the detection unit including: a light source configured to emit light to the silica aerogel, the light having at least a portion of a range of wavelengths of 1850 nm or greater and 1970 nm or less; a light receiving unit configured to receive the light which has passed through the silica aerogel and has at least a portion of the range of wavelengths of 1850 nm or greater and 1970 nm or less; and a calculation unit configured to calculate the fluctuation in moisture content within the measurement object space from change in light intensity of the light received by the light receiving unit. | 04-17-2014 |
20140114188 | ACOUSTO-OPTIC VIBROMETER - An acousto-optic vibrometer includes: an acoustic wave source to irradiating an object with an acoustic wave; an acoustic lens system which places a scattered wave from the object into a predetermined converged state; an acousto-optic medium portion in which the scattered wave transmits; a sensing light source to emit a sensing light beam in which monochromatic rays of light with different traveling directions are superposed and which is incident on the acousto-optic medium portion; a reference light source to emit a reference light beam in which monochromatic rays of light with different traveling directions are superposed and which is to be superposed on sensing light beam based diffracted light produced by the acousto-optic medium portion; an imaging lens system which converges the diffracted light on which the reference light beam is superposed; and an image receiving section which senses the light converged by the imaging lens system. | 04-24-2014 |
20140121490 | ACOUSTO-OPTIC IMAGING DEVICE - An acousto-optic imaging device includes: an ultrasonic wave transmitter for transmitting a divergent ultrasonic wave into a subject; an acoustic lens for converging a reflection ultrasonic wave derived from the ultrasonic wave from the subject; an acousto-optic cell including an acousto-optic propagation medium section which has a smaller sound velocity than the subject and through which the reflection ultrasonic wave converged by the acoustic lens propagates; a light source for emitting convergent light so as to irradiate the reflection ultrasonic wave propagating through the acousto-optic propagation medium section in a direction not parallel to a traveling direction of the reflection ultrasonic wave; and an image formation optical system for detecting Bragg diffracted light of the convergent light which is produced in the acousto-optic propagation medium section and converting the detected Bragg diffracted light to an electric signal. | 05-01-2014 |
20140126324 | ACOUSTO-OPTIC IMAGE CAPTURE DEVICE - An acousto-optic image capture device includes: an acoustic beam source, an acoustic lens system; an acousto-optic medium portion arranged on the path of the scattered wave transmitted through the acoustic lens system; a light source that emits a light beam including monochromatic rays of light toward the acousto-optic medium portion obliquely; an imaging lens system that condenses diffracted rays of light produced by the acousto-optic medium; and an image receiving section that detects the rays of light condensed by the imaging lens system. The acoustic lens system includes at least a telecentric acoustic system and a sound-collecting acoustic system arranged on the image space. The distance between acoustic systems is equal to the sum of the respective focal lengths of the telecentric acoustic system and the sound-collecting acoustic system. The light beam is transmitted at the focal point of the sound-collecting acoustic system through the acousto-optic medium portion. | 05-08-2014 |
20140293737 | ACOUSTO-OPTIC IMAGE CAPTURE DEVICE - An acousto-optic image capture device includes: an acoustic wave source to irradiating an object with an acoustic wave; an acoustic lens system which transforms a scattered wave from the object into a plane acoustic wave; an acousto-optic medium portion which is arranged so that the scattered wave transmitted through the acoustic lens system is incident there; a light source to emit a light beam in which monochromatic rays of light with different traveling directions are superposed and which is incident on the acousto-optic medium portion; an imaging lens system which condenses diffracted rays of light of the plane wave monochromatic rays of light produced by the acousto-optic medium portion; and an image receiving member which detects the rays of light condensed by the imaging lens system to output an electrical signal. The acoustic lens system includes at least two reflecting mirrors. | 10-02-2014 |