According to one embodiment, a corrosion determination system according to an embodiment includes one or more sensors, an index data acquirer, and a corrosion determiner Elastic waves generated from a structure including at least a member that generates elastic waves due to corrosion are detected. The index data acquirer acquires index data that is an index of an amount of water on the surface of the structure. The corrosion determiner determines whether there is corrosion in the structure based on elastic waves generated due to corrosion identified based on the index data among a plurality of elastic waves detected by the one or more sensors.

Ultrasonic pulse velocity (UPV) is an extremely important parameter for the assessment of strength of concrete structures and study of elastic properties. ASTM international standard: (ASTM: C597-09) covers the determination of the propagation velocity of longitudinal stress wave pulses through concrete. The suggested method involves transmission of longitudinal ultrasound by transmitting transducer and receiving by a suitable similar transducer. The transit time-measurement and the associated triggering pulses must provide the overall time-measurement resolution of at least 1 μs. The present invention relates to the design of ultrasonic pulse velocity measuring device capable to generate ultrasound preferably in the solid materials including concrete or material supporting the propagation of ultrasound and precisely measure the ultrasonic propagation delay time commonly known as the transit time. The present invention relates to an improved design of an ultrasonic transit time measurement device having provision for automatic pulse threshold error correction. The invention also discloses the method to realize fast counting for the generation of high resolution with relatively slower microcontrollers. The accuracy in the transit time measurement is relatively improved by subtracting the threshold corrected zero offset (without material under test) from the threshold corrected transit time (with sample).

A diagnosis device includes a data acquirer, a data recorder, and a health diagnoser. The data acquirer acquires a measurement data of a structure at a predetermined timing. The data recorder causes a storage to store the measurement data acquired by the data acquirer as a standard data. The health diagnoser diagnoses a health of the structure by comparing the measurement data that is acquired by the data acquirer this time with the standard data that has been acquired by the data acquirer last time and stored in the storage.

Systems and techniques for measuring process characteristics including electrolyte distribution in a battery cell. A non-destructive method for analyzing a battery cell includes determining acoustic features at two or more locations of the battery cell, the acoustic features based on one or more of acoustic signals travelling through at least one or more portions of the battery cell during one or more points in time or responses to the acoustic signals obtained during one or more points in time, wherein the one or more points in time correspond to one or more stages of electrolyte distribution in the battery cell. One or more characteristics of the battery cell are determined based on the acoustic features at the two or more locations of the battery cell.

A gas sensor having a heater, a receiver, and a space arranged between the heater and the receiver, is described, the heater being configured to generate a thermoacoustic sound wave propagating through the space by using a stimulation signal. The receiver is in this case configured to receive the thermoacoustic sound wave that has propagated through the space and to convert it into a reception signal that has a time-of-flight-dependent shift with respect to the stimulation signal and therefore information relating to the gas concentration in the space.

A method of distinguishing a first physical phenomenon captured in a sensory measurement time waveform from a second physical phenomenon captured in the waveform includes: receiving the waveform on a processor from a sensor in sensory contact with an object undergoing first and second physical phenomena, wherein the first phenomenon is a comparatively fast event; deriving a first rate of change data stream from the time waveform with a processor operable on a processor, wherein each value of the first rate of change data stream is based on a difference in extreme amplitudes of the waveform during a first interval of waveform samples; and analyzing with the processor the derived first rate of change data stream to distinguish the comparatively fast first physical phenomena from the second physical phenomenon captured in the waveform.

The present invention provides a management method, a measuring method, a measuring device, a crystal oscillator sensor and a set for more easily managing the purity of a chemical liquid containing an organic solvent. The management method of the present invention is a management method of managing a purity of a chemical liquid containing an organic solvent by sensing impurities in the chemical liquid. The management method includes Step 1 of preparing a target chemical liquid containing an organic solvent; Step 2 of bringing the target chemical liquid into contact with a crystal oscillator sensor including an adsorption layer that adsorbs the impurities and a crystal oscillator and obtaining an amount of change in a resonance frequency of the crystal oscillator resulting from contact of the target chemical liquid; and Step 3 of managing the purity of the chemical liquid by comparing whether or not the obtained amount of change in the resonance frequency falls within a permissible range of the amount of change in the resonance frequency based on a preset purity of the target chemical liquid. In Step 2, at least a part of a liquid contact portion coming into contact with the target chemical liquid is made of a fluorine-based resin.

A method and system are described for processing tissues according to particular processing protocols that are established based on time-of-flight measurements as a processing fluid is diffused into a tissue sample. In one embodiment, measurement of the time it takes about 70% ethanol to diffuse into a tissue sample is used to predict the time it will take to diffuse other processing fluids into the same or similar tissue samples. Advantageously, the disclosed method and system can reduce overall processing times and help ensure that only samples that require similar processing conditions are batched together.

Methods and systems for material identification include generating a plurality of first fingerprints for a plurality of material sheets supplied by a supplier at a first step of processing the plurality of material sheets. Each first fingerprint in the plurality of first fingerprints represents a first attenuation measurement of each material sheet in the plurality of material sheets as captured by an array of transducers. Further, the methods and systems include generating a batch mask relating to the first step of processing the plurality of material sheets and based on the plurality of first fingerprints. The batch mask represents a signal correlation of the plurality of first fingerprints that is unique to the plurality of material sheets supplied by the supplier. A target material can be identified using the batch mask.

Methods and systems for inspecting a weld area between a first and a second metallic sheet are provided an acoustic wave is generated in the first metallic sheet for propagation towards the second metallic sheet, across the weld area. A weld quality indicator is obtained. In some variants, the weld quality indicator is obtained from a comparison of first and second sheet time-varying signals representative of a surface motion in the first and second metallic sheets. In some variants, the weld quality indicator is based on the frequency-dependent attenuation of the acoustic wave in the second metallic sheet.