Abstract: A photoacoustic detecting device to be applied, via a contact face, against a medium to be analyzed, is disclosed. The device includes: a hollow cavity that opens onto a contact aperture, the contact aperture being produced in the contact face; a pulsed or amplitude-modulated light source configured to emit, when activated, an incident light beam, in an emission spectral band, through the cavity, to the contact aperture; and an acoustic transducer connected to the cavity and configured to detect a photoacoustic wave extending through the cavity. Under the effect of illuminating the medium by the incident light beam, the acoustic transducer detects an acoustic wave produced by heating the medium. The cavity includes a membrane extending through the cavity, facing the contact face. The membrane is bounded by a lower face and an upper face. The membrane includes through-apertures produced between the lower face and the upper face.

Abstract: The present invention aims at providing a small-diameter wire/rod/tube ultrasonic detector with an end blind area and an automatic ultrasonic nondestructive detecting system, wherein a sealing cover of the ultrasonic detector is located on a water storage device; an annular array unit mounting rack and a water pump are fixed in the water storage device, and an annular array detecting unit is connected to the annular array unit mounting rack; the water pump is connected to an input end of water circulation input and output; a sensor is mounted in one side of the sealing cover in which a detected material is allowed to enter; the annular array detecting unit comprises an outer ring part and an inner ring part, and the outer ring part and the inner ring part are connected into a whole by means of a wire inlet side end cover and a wire outlet side end cover; the outer ring part consists of an outer ring substrate and an outer ring arraying probe, and the inner ring part consists of an inner ring inner core and an

Abstract: An acoustic impedance measuring system configured to measure an acoustic impedance of an acoustic component includes a first chamber, a second chamber, a first sound pressure sensing device, a second sound pressure sensing device and a sound source. The first sound pressure sensing device is configured to sense a sound pressure in the first chamber. The second sound pressure sensing device is configured to sense a sound pressure in the second chamber. The sound source is connected to the first chamber, wherein the sound source generates a sound propagating towards a first cavity inside the first chamber. The acoustic component is disposed between the first chamber and the second chamber for being measured the acoustic impedance of the acoustic component, and the acoustic impedance of the acoustic component is measured by the first sound pressure sensing device and the second sound pressure sensing device.

Abstract: A method of designing a test fixture configured to mount to a vibration slip table and fix a test article to the vibration slip table during a vibration test includes performing finite element analysis using one or more boundary conditions determined from parameters of the vibration slip table, the test article, or the vibration test to optimize a topology of the test fixture, and outputting a geometric model of the test fixture having the optimized topology. Another method of designing a test fixture includes inputting the one or more boundary conditions into a topology optimizing solver. A vibration test system includes a test fixture designed according to the method.

Abstract: A density detection system uses a magnetic force feedback actuator positioner to maintain a precise selected pressure between transducer wheels and the surface of a sheet of material as the sheet of material moves through a position between transducer wheel and lift wheel. Consequently, the antiquated mechanical/pneumatic springs/airbags of prior art ultrasonic density detection systems are replaced with a highly responsive magnetic force feedback actuator positioner capable of providing a precise and relatively constant force that can react to the introduction of a sheet of material, and/or variations in the surface of a sheet of material, extremely rapidly without the bounce/recovery oscillations associated with prior art ultrasonic density detection systems. Consequently, precise density measurements of an entire sheet of material can be obtained with unprecedented accuracy.

Abstract: An integrated photoacoustic transducer, sensing system and method for assisting in sensing a concentration of a species in a fluid such that the integrated photoacoustic transducer includes a waveguide structure. The waveguide structure has an optical resonance spectrally overlapping a spectral absorption line or band of the species. The photoacoustic transducer includes at least one acoustic cavity formed in a portion of the waveguide structure and configured for receiving the fluid for sensing comprising the species. The at least one acoustic cavity has an acoustic resonance spectrally overlapping with a harmonic of a modulation frequency. At least one acoustic transducer comprising a deformable mechanical portion is included in the photoacoustic transducer.

Abstract: A photoacoustic gas sensor device is proposed for determining a value indicative of a presence or a concentration of a component in a gas. The photoacoustic gas sensor device comprises a substrate, and a measurement cell body arranged on a first side of the substrate. The substrate and the measurement cell body define a measurement cell enclosing a measurement volume. The measurement cell comprises an aperture for a gas to enter the measurement volume. The device further comprises an electromagnetic radiation source for emitting electromagnetic radiation, and a microphone for measuring a sound wave generated by the component in response to an absorption of electromagnetic radiation by the component. The electromagnetic radiation source and the microphone are arranged on the first side of the substrate and in the measurement volume. The microphone has a bottom port facing the substrate, and the measurement volume is communicatively coupled to the bottom port.

Abstract: An assembly and method for detecting cross bores involving a sewer system and a gas pipe includes an acoustic generator placed within an interior of the sewer system and an acoustic receiver placed either within an interior of the gas pipe or in proximity to an end of the gas pipe. The acoustic generator generates an acoustic signal to transmit through the interior of a sewer pipe of the sewer system. A controller detects, in response to the acoustic receiver hearing the acoustic signal, a cross bore involving the sewer pipe and the gas pipe. A microphone may be placed within the interior of the sewer system at a location remote from the acoustic generator. In this case, the controller determines, in response to the acoustic receiver not hearing the acoustic signal and the microphone hearing the acoustic signal, that a cross bore involving the sewer pipe and the gas pipe is absent.

Abstract: A method and system for cement evaluation. The method may include disposing an acoustic logging tool into a pipe string that is disposed in a first casing of a wellbore, transmitting an acoustic wave at a first location within the wellbore from an acoustic source disposed on the acoustic logging tool, and recording one or more acoustic signals with one or more receivers on the acoustic logging tool at the first location. The method may further include performing a multichannel multimode dispersion analysis of the one or more acoustic signals, extracting one or more fluid modes propagating in the first casing from the dispersion analysis, extracting one or more pseudo-lamb waves propagating in the first casing from the dispersion analysis, extracting one or more pseudo-SH-plate waves propagating in the first casing from the dispersion analysis, and identifying a bonding condition between the first casing and a cement.

Abstract: A system and method for accessing contents of a tank through a tank opening disposed on the tank. The system and method may obtain samples, use a sensor to analyze sludge or may clean the tank. The system has a rotatable head connected to a rigid tube having a central axis. The rotatable head is adapted to be inserted through the tank opening. The rotatable head comprises a displacer and a head opening. A flexible tube has an insertable end and an external end. The flexible tube is slideably movable within the rigid tube and has a range of motion relative to the rigid tube so that the insertable end of the flexible tube can be directed by the displacer through the head opening at an angle offset from the central axis of the rigid tube.

Abstract: Provided are systems and methods for line volume calibration, and measurement of fluid samples delivered to an interrogation point. In various embodiments, a known fluid volume comprising a sample line fluid and a secondary fluid is delivered to a fluid boundary sensor. The fluid boundary sensor assists in determining the position of the boundaries between the various fluids, and the positions of these boundaries are used to determine the sample line fluid volume.

Abstract: A photoacoustic detector unit comprises a housing having an opening, and also a photoacoustic transducer designed to convert optical radiation into at least one from a pressure signal or a heat signal. The photoacoustic transducer covers the opening of the housing, such that the photoacoustic transducer and the housing form an acoustically tight cavity. A pressure pick-up is arranged in the acoustically tight cavity.

Abstract: In some implementations, a system may receive a cable map for a deployed cable. The system may receive vibration data indicating a vibration associated with a first section of the cable. The system may determine a characteristic associated with the first section of the cable based on the vibration. The system may determine a location associated with the characteristic based on the cable map. The system may determine that the first section of the cable is associated with the location based on the location being associated with the characteristic. The system may associate the location and a length of a second section of the cable extending from an initial location to the location. The system may receive an input identifying the length of the second section of the cable and may output the location based on associating the location and the length of the second section of the cable.

Abstract: The invention relates to a modulatable infrared emitter comprising an aperture structure, a structured micro-heating element, and an actuator, wherein the aperture structure and the structured micro-heating element are movable relative to each other in parallel planes by means of the actuator to modulate the intensity of emitted infrared radiation. The invention further relates to methods of manufacturing the infrared emitter, a method of modulating emission of infrared radiation using the infrared emitter, and preferred uses of the infrared emitter. In further aspects the invention relates to a system comprising the infrared emitter and a control device for regulating the actuator.

Abstract: A photo-acoustic gas sensor using a method for modulating the wavelength of the laser radiation, the modulation being obtained via judicious use of an electric current, called the generation current, which pumps the one or more laser sources, and is configured to cause the one or more laser sources to operate in pulsed mode, and of a current, called the base current, which takes non-zero values between each laser pulse with a lower magnitude than the magnitude of the generation current, the magnitude of base current being modulated so that the one or more laser sources emit, into the cell, light radiation having a wavelength that varies periodically about a central wavelength so as to take, at regular intervals, a value specifically suitable for the excitation of a gas to be detected, whereby an interaction between the light radiation and the gas to be detected contained in the cell induces the generation of acoustic waves at a resonant frequency of the cell.

Abstract: Methods and apparatus for inspecting oilfield infrastructure components. Methods include methods of identifying a micro-annulus outside a casing in a cemented wellbore. Methods may include transmitting an acoustic pulse incident on the casing; making a measurement of a first acoustic impedance property value from pulse-echo information generated responsive to an echo of the acoustic pulse reflected from the casing; propagating a circumferential guided wave in the casing; making a measurement of a second acoustic impedance property value from propagating wave information generated responsive to the propagating acoustic wave; and determining from the first acoustic impedance value and the second acoustic impedance value a presence of a micro-annulus between the casing and the cement.

Abstract: A pseudo-static test device and method for seismic behavior of connection joints of a wallboard. The device includes ground anchor holes, a support frame including a steel beam and two steel columns, and a test wallboard. A bottom plate of the steel beam is provided with at least two first connecting holes. A top plate each steel column is provided with a second connecting hole. A bottom plate of each steel column is provided with a third connecting hole. The bottom plate of the steel beam is provided with a connection joint assembly configured to hingedly or rigidly connect a top of the test wallboard to the steel beam. Each first connecting hole is connected to the second connecting hole through a flange assembly.

Abstract: Disclosed are a linkage device, a transceiver module and a plane stress field measuring device and method capable of achieving synchronous adjustment of distance and angle, and relates to the field of ultrasonic non-destructive testing. The existing technical means for measuring plane stress in the field of ultrasonic testing has the shortcomings that the same testing is only applicable for single materials and the deflection angles of transmitting and receiving transducers are inconsistent.

Abstract: According to an embodiment, an inspection device includes a transmitter, a receiver, and a processor. The transmitter transmits a first ultrasonic wave including burst waves of a first period. The first ultrasonic wave is incident on an inspection object between the transmitter and the receiver. The first ultrasonic wave passed through the inspection object is incident on the receiver. The receiver outputs a signal corresponding to the first ultrasonic wave. The processor obtains the signal and performs a first operation. The first operation includes deriving first and second signal values from the signal, and inspecting the inspection object based on at least one of the first signal values and at least one of the second signal values. The first signal values correspond to maximum values of the signal in each of first periods The second signal values correspond to maximum values of the signal in each of second periods.

Abstract: A system for detecting characteristics of a fluid includes a sonic sensor. The sonic sensor includes a transducer, a transduction surface, and an acoustically reflective pad member. The transducer may be contained within a probe body, and the transduction surface may be an element of the probe body. A stem may connect the pad member to the transduction surface. The transducer will generate pulses that are transmitted to the pad member via a fluid when the transduction surface and pad member are immersed in the fluid. The system will detect the pulses when reflected and use that data to determine a speed of sound within the fluid. The system may use the speed of sound to determine density, specific gravity and/or stiffness of the fluid. The system may use that determination to assess a level of processing activity of the fluid, such as fermentation activity.