The disclosure discloses a laser opto-ultrasonic dual detection method and device using a pulse laser incident on the surface of a sample to generate plasma and the optical emission and ultrasonic waves are generated, to simultaneously analyze the element compositions, structural defects and residual stress of the sample. The detection system includes an excitation unit, a spectrum detection module, an ultrasonic detection module and an analysis control module. The digital delayer generator is connected to the computer, the high-precision 3D displacement platform is electrically connected to the digital delayer generator. The the pulsed laser is focused on and incident onto the surface of the sample to be tested through modulation of the optical path system to generate plasma, which simultaneously generate optical emission and ultrasonic waves. The ultrasonic detection unit is configured to detect the ultrasonic waves. The spectrum detection unit is configured to detect the plasma emission spectrum.

This disclosure presents a process to determine characteristics of a subterranean formation proximate a borehole. Borehole material can be typically pumped from the borehole, though borehole material can be used within the borehole as well. Extracted material of interest can be collected from the borehole material and prepared for analyzation. Typically, the preparation can utilize various processes, for example, separation, filtering, moisture removal, pressure control, cleaning, and other preparation processes. The prepared extracted material can be placed in a photoacoustic device where measurements can be taken, such as a photoacoustic imager or a photoacoustic spectroscopy device. A photoacoustic analyzer can generate results utilizing the measurements, where the results of the extracted material can include one or more of fracture parameters, fracture plane parameters, permeability parameters, porosity parameters, and composition parameters. The results can be communicated to other systems and processes to be used as inputs.

A part defect testing system includes a hammer beam system that provides laser light having a first wavelength. A read-out beam system provides laser light having a second wavelength. A control system is used to direct the generated hammer beam laser light toward a first position on a part to provide an acoustic hammer pulse that induces surface movement of the part. An areal camera is arranged to produce an interferogram derived from reading surface movement of the part using the read-out beam directed to a second position on the part.

The invention relates to a device (1) and a corresponding method for mid-infrared microscopy and/or analysis, the device (1) comprising at least one radiation unit (10) configured to generate radiation (11) of time-varying intensity, the radiation (11) comprising one or more wavelengths in the mid-infrared spectral range, at least one refractive and/or reflective optical unit (12) which is configured to focus and/or direct the radiation (11) to at least one region or point of interest (20) located on and/or with-in an object (2), at least one detection unit (18) configured to detect ultrasound waves (17) emitted by the object (2) at the at least one region or point of interest (20) in response to an interaction of the radiation (11) with the object (2) and to generate according detection signals, and an evaluation unit (25) configured to derive infor-mation regarding at least one property of the object (2) from the detection signals and/or to generate a spatial and/or spatio-temporal distribution of the detection sig-nals or of information derived from the detection signals obtained for the at least one region or point of interest (20) located on and/or within the object (2).

Photoacoustic detecting device (1) intended to be applied, via a contact face (3), against a medium (2) to be analysed, the device comprising: a hollow cavity (20) that opens onto a contact aperture (22), the contact aperture being produced in the contact face; a pulsed or amplitude-modulated light source (10) configured to emit, when it is activated, an incident light beam (11), in an emission spectral band (LA), through the cavity (20), to the contact aperture; an acoustic transducer (28) connected to the cavity, and configured to detect a photoacoustic wave (12) extending through the cavity; such that, under the effect of an illumination of the medium by the incident light beam, the acoustic transducer detects an acoustic wave produced by heating of the medium (2); wherein the cavity comprises a membrane extending through the cavity, facing the contact face; the membrane is bounded by a lower face (23.sub.i) and an upper face (23.sub.s), the membrane comprising through-apertures (23.sub.o) produced between the lower face and the upper face.

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.

A transparent ultrasound transducer has a transparent substrate and a transparent transducer structure. The transducer structure has a bottom electrode, a top electrode electrically insulated from the bottom electrode, and an array of acoustically active elements within a separating layer between the top electrode and the bottom electrode. The top electrode and bottom electrode have a conductive transparent material. One or both of the top electrode and the bottom electrode have a composite layer made from the conductive transparent material and a supplemental material that has a greater conductivity of the conductive transparent material. A majority of an area of the composite layer comprises the conductive transparent material.

A system for measuring a membrane potential is disclosed. The system comprises a photoacoustic probe including a laser and an ultrasound transducer. The laser is configured to emit a light signal at one or more wavelengths to a neuronal cell. The neuronal cell may comprise a voltage-sensitive protein configured to absorb the light signal in a voltage-dependent manner. The ultrasound transducer is configured to receive a photoacoustic signal from the voltage-sensitive protein in response to absorbing the light signal. The system further comprises a processor configured to receive the photoacoustic signal from the ultrasound transducer and calculate a membrane potential of the neuron based on the photoacoustic signal. Methods of measuring a membrane potential and biomaterials related to the voltage-sensitive protein are also disclosed herein.

Provided are a photoacoustic image generation apparatus, a photoacoustic image generation method, and a photoacoustic image generation program that can perform a more appropriate reconstruction process regardless of the type of probe, without causing a reduction in the speed of an arithmetic process. It is identified whether a probe that detects photoacoustic waves and outputs a photoacoustic wave detection signal is a probe in which detection elements are arranged by a coordinate system using polar coordinates or a probe in which detection elements are arranged by a rectangular coordinate system. In a case in which the probe is identified as the probe in which the detection elements are arranged by the coordinate system using the polar coordinates, a time domain reconstruction process is selected to generate a photoacoustic image.

An additive manufacturing apparatus according to one embodiment includes a manufacturing unit, an elastic wave generation unit, an elastic wave detection unit, and an inspection unit. The manufacturing unit sequentially stacks a layer formed by emitting a first energy beam to a material and solidifying the material. The elastic wave generation unit emits a second energy beam to a manufactured object including the layer and generates an elastic wave propagating in the manufactured object. The elastic wave detection unit detects the elastic wave. The inspection unit inspects the manufactured object on the basis of a detection result from the elastic wave detection unit.