Provided is an ultrasonic probe having an adjustable slew rate, the ultrasonic probe having minimal dimensions and circuit sizes. The ultrasonic probe includes: a transducer; a transmitting circuit; a correcting unit; and a distributing unit. The transmitting circuit includes a transducer driving unit and a current source. The transducer driving unit includes a current mirror of a low voltage transistor and a high voltage transistor. The high voltage transistor is connected to the transducer and the current source supplies an operating current to the low voltage transistor of the transducer driving unit. The correcting unit includes a transmission circuit driving unit replica, a bias unit, and an observing unit. The distributing unit transfers a signal to a current source of the transmitting circuit so that the same current value as the current value extracted by the observing unit flows.

A method for calibrating an ultrasonic sensor including a transducer, a reflector spaced a known distance from the transducer, and a memory. A water bath is heated to approximately fifty centigrade and the ultrasonic sensor is at least partially submerged in the water bath. When submerged, an ultrasonic wave is transmitted through a portion of the water bath from the transducer. The ultrasonic wave is transmitted toward the reflector and a reflected ultrasonic wave is received back at the transducer. A time of flight of the ultrasonic wave is measured. A calibration coefficient is determined based on the time of flight of the ultrasonic wave and an expected time of flight of the ultrasonic wave. The calibration coefficient is loaded into the memory of the ultrasonic sensor.

Methods and systems for determining a change in condition of a rock bolt. Some methods may comprise, at a first point in time, propagating shear and longitudinal ultrasonic waves along the rock bolt to measure a first time of flight for each of the shear and longitudinal waves, at a second point in time after the first point in time, propagating shear and longitudinal ultrasonic waves along the rock bolt to measure a second time of flight for each of the shear and longitudinal waves, and using the relative changes of the first and second time of flights, determining the change in condition of the rock bolt section.

There are provided a device for removing partial discharge noise and a method of diagnosing the same. The device includes a noise removing device configured to remove noise of a partial discharge signal using a reaction rate difference of signals when the partial discharge signal is generated, and output a signal in which noise is removed, a laser module configured to output a laser beam to a surface of a power device when the partial discharge signal is generated and extract sound wave and vibration data from a reflection signal of the laser beam, a correlation analyzing unit configured to compare the partial discharge signal in which noise is removed input through a sensor connecting unit and the sound wave and vibration data extracted through the laser module, and analyze a correlation, and a partial discharge diagnostic unit configured to perform partial discharge diagnosis on a signal that matches the partial discharge signal in which noise is removed with at least one of a generation cycle, a time, and a phase of the sound wave and vibration data based on a result of correlation analysis of the correlation analyzing unit.

There are provided a device for removing partial discharge noise and a method of diagnosing the same. The device includes a noise removing device configured to remove noise of a partial discharge signal using a reaction rate difference of signals when the partial discharge signal is generated, and output a signal in which noise is removed, a laser module configured to output a laser beam to a surface of a power device when the partial discharge signal is generated and extract sound wave and vibration data from a reflection signal of the laser beam, a correlation analyzing unit configured to compare the partial discharge signal in which noise is removed input through a sensor connecting unit and the sound wave and vibration data extracted through the laser module, and analyze a correlation, and a partial discharge diagnostic unit configured to perform partial discharge diagnosis on a signal that matches the partial discharge signal in which noise is removed with at least one of a generation cycle, a time, and a phase of the sound wave and vibration data based on a result of correlation analysis of the correlation analyzing unit.

A measuring device for measuring an inspection target on the basis of vibration generated when the inspection target has been irradiated with laser light includes a condensing position deriving portion configured to derive an amount of adjustment of a distance between condensing lenses of a laser condensing unit configured to condense the laser light on the basis of a distance between a laser device configured to radiate the laser light and an irradiation location of the laser light and a communicating portion configured to transmit control information including information representing the amount of adjustment to the laser condensing unit.

An apparatus for inspecting a well having nested multi-tubular structure, includes: an acoustic transducer conveyed in an inner-most tubular in the structure and configured to receive a return acoustic signal having a plurality of resonances due to the structure; an acoustic impedance matching material disposed on a sensing face of the acoustic transducer; a signal generator that generates a signal having a plurality of frequencies to drive the acoustic transducer; a signal shaper that modifies the signal to provide a drive signal to the acoustic transducer; and a processor configured to determine an annulus distance of any tubular in the structure with respect to an adjacent tubular using a time of flight of a transmitted acoustic signal, an acoustic speed in a component in the nested multi-tubular structure using the annulus distance and the plurality of resonances, and a characteristic of the component that corresponds with the acoustic speed.

A device and a method for detecting at least one defect in a test object (2). At least one test head (1) radiates an ultrasonic signal at different measuring points (MP) into the test object (2) with each point at an insonation or radiation angle (α) in order to ascertain multiple measurement data sets (MDS). The angle is constant for each data set (MDS). An analyzing unit (4) carries out an SAFT (Synthetic Aperture Focusing Technique) analysis for each ascertained measurement data set (MDS) using a common reconstruction grid (RG) inside the test object (2) in order to calculate an SAFT analysis result for each measurement data set (MDS). The analyzing unit (4) superimposes the calculated SAFT analysis results in order to calculate an orientation-independent defect display value (S.sub.RP) for each reconstruction point (RP) of the common reconstruction grid (RG).

A sensor for ultrasonically measuring a portion of a structure having a temperature significantly above room-temperature, the sensor comprising: a high-temperature portion for intimate contact with the structure, the high-temperature portion comprising at least: at least one transducer for converting a first signal to an ultrasonic transmit signal, and for converting an ultrasonic reflected signal to a second signal; a low-temperature portion comprising at least: at least one digital sensor interface (DSI) to which the transducer is electrically connected, the DSI being configured to transmit the first electrical signal and receive the second electrical signal, and to generate an A-scan signal based on the first and second electrical signals; a wireless interface for transmitting a digital signal based directly or indirectly on at least said A-scan signal; and a battery for powering the DSI and the wireless interface; and an elongated member containing one or more electrical conductors for conducting the first and second signals between the transducer and the DSI, the elongated member being configured to offset the low-temperature portion a sufficient distance away from the high-temperature portion such that the low-temperature portion is subjected to significantly less heat from the structure compared to the high-temperature portion.

A respiratory flow therapy apparatus including a sensor module can measure a flow rate of gases or gases concentration provided to a patient. The sensor module can be located after a blower and/or mixer. The sensor module can include at least an ultrasonic transmitter, a receiver, a temperature sensor, a pressure sensor, a humidity sensor and/or a flow rate sensor. The receivers can be immersed in the gases flow path. The receivers can cancel delays in the transmitters and improve accuracy of measurements of characteristics of the gases flow. The receivers can allow for detection of a fault condition in a blower motor of the apparatus.