An object information acquiring apparatus comprises a light irradiation unit that irradiates an object with pulsed light; a probe that converts an acoustic wave generated in the object due to first pulsed light into an acoustic wave signal; a photo-detection unit that converts second pulsed light propagated through the object into an optical signal; a frequency analysis unit that acquires a background optical coefficient with respect to the inside of the object on the basis of a predetermined frequency component of the optical signal; a light intensity acquiring unit that acquires a distribution of light intensity of the first pulsed light reaching the inside of the object using the background optical coefficient; and an information acquiring unit that acquires object information, using the acoustic wave signal and the distribution of light intensity.

A photoacoustic apparatus includes a light irradiation unit configured to irradiate a subject with light a plurality of times; a driving unit configured to move a supporting member so that relative positions of the supporting member and the subject differ at each of the plurality of times; a plurality of transducers configured to receive acoustic waves generated through the plurality of times of irradiation and output a plurality of groups of reception signals corresponding to the plurality of times of irradiation; the supporting member configured to support the transducers such that directional axes of at least some of the transducers converge; a first memory configured to store the groups of reception signals; and a processing unit configured to obtain subject information at a target position by assigning, to each of the groups of reception signals, a weight corresponding to relative positions of the supporting member and the target position.

A photoacoustic remote sensing system (PARS) for imaging a subsurface structure in a sample has an excitation beam configured to generate ultrasonic signals in the sample at an excitation location; an interrogation beam incident on the sample at the excitation location, a portion of the interrogation beam returning from the sample that is indicative of the generated ultrasonic signals; an optical system that focuses at least one of the excitation beam and the interrogation beam with a focal point that is below the surface of the sample; and a detector that detects the returning portion of the interrogation beam.

A photoacoustic apparatus according to the present invention includes a light source, a conversion element configured to receive photoacoustic waves generated from light from the light source irradiated to a subject and output a signal, a color information acquiring unit configured to acquire information regarding color on the subject, a coefficient information acquiring unit configured to acquire information regarding an optical coefficient of the subject corresponding to the information regarding color of the subject acquired by the color information acquiring unit, and a subject information acquiring unit configured to acquire subject information based on the signal output from the conversion element and the information regarding the optical coefficient acquired by the coefficient information acquiring unit.

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.

A processing apparatus, comprises: a first acquirer configured to acquire a first specific information distribution of an object based on acoustic waves propagating from the object onto which light is irradiated; a second acquirer configured to acquire a characteristic value of the first specific information distribution of the object; a third acquirer configured to acquire information indicating a correspondence between an optical coefficient and the characteristic value of the first specific information distribution; and a fourth acquirer configured to acquire the optical coefficient of the object using the characteristic value of the first specific information distribution of the object and the information indicating the correspondence.

A method for testing a lifetime of a surface state carrier of a semiconductor, including the following steps, 1) a narrow pulse light source is used to emit a light pulse, and coupled to an interior of a near-field optical probe, and the near-field optical probe produces a photon-generated carrier on a surface of a semiconductor material under test through excitation. 2) The excited photon-generated carrier is concentrated on the surface of the semiconductor material, and recombination is conducted continuously with a surface state as a recombination center. 3) A change in a lattice constant is produced due to an electronic volume effect, a stress wave is produced, and a signal of the stress wave is detected in a high-frequency broadband ultrasonic testing mode. 4) Fitting calculation is conducted on the signal of the stress wave to obtain the lifetime of the surface state carrier τ.sub.c.

A photoacoustic gas sensor device for deter-mining a value indicative of a presence or a concentration of a component in a gas comprises a substrate and a measurement cell body, the substrate and the measurement cell body defining a measurement cell enclosing a measurement volume. A reflective shield divides the measurement volume into a first volume and a second volume. An opening in the measurement cell is provided for a gas to enter the measurement volume. In the first volume and on a front side of the substrate are arranged: An electromagnetic radiation source for emitting electromagnetic radiation through an aperture in the reflective shield into the second volume; and a pressure transducer communicatively coupled to the second volume for measuring a sound wave generated by the component in response to an absorption of electromagnetic radiation by the component. At least a portion of a surface of the reflective shield facing the second volume is made of a material reflecting electromagnetic radiation.

Technologies are generally described for normalized standard deviation transition based dosimetry monitoring for laser treatment. In some examples, a response signal may be generated based on a physical response to a laser pulse detected through acoustic or optical means. Each response signal may be a time series of data with a number of points. Standard deviation may be determined for each response signal and normalized using a mean or comparable normalization factor. Thus, a robust distribution may be computed from the response to each laser pulse. A change in the normalized standard deviation from each single pulse's time domain response data may be used to determine how many laser pulses remain before completion of the treatment (similar to event onset response). Thus, laser treatment may be continued based on an estimation of remaining pulses for completion or ceased if completion is reached.

A photoacoustic remote sensing system (PARS) for imaging a subsurface structure in a sample, comprising one or more laser sources configured to generate a plurality of excitation beams configured to generate pressure signals in the sample at an excitation location, and a plurality of interrogation beams incident on the sample at the excitation location, a portion of the plurality of interrogation beams returning from the sample that is indicative of the generated pressure signals, an optical system configured to focus the plurality of excitation beams at a first focal point and the plurality of interrogation beams at a second focal point, the first and second focal points being below the surface of the sample, and a plurality of detectors each configured to detect a returning portion of at least one of the plurality of interrogation beams.