Abstract: A tester includes self-test functions to test a state of a measurement circuit in the tester. For example, the self-test functions test an electrical state, e.g., electrical properties or connection or disconnection states, of a component of the measurement circuit. The self-test functions also test the signal state of an electrical component in the measurement circuit, which may include signal detection, signal transmittance, or measurement properties of the electrical component. The self-test functions improve the user experience of the tester from safety and reliability perspectives.

Abstract: A single handheld multimeter device includes two or more independent measurement channels that are completely electrically separated and independent from one another. Each measurement channel has its point of reference, typically configured to be coupled to the ground. Measurements by the two or more independent measurement channels can be conducted concurrently, and the measurement results of the two channels can be processed and displayed together.

Abstract: There is provided a measurement apparatus for a vacuum furnace, comprising a data acquisition device, comprising a sensor interface operable to electrically couple one or more sensors to the data acquisition device, and a thermally conductive layer disposed on a first surface of the data acquisition device and to provide a thermally conductive interface between the first surface of the data acquisition device and a cooled internal surface of the vacuum furnace.

Abstract: A control system controls an inductor-inductor-capacitor (LLC) converter according to a switching method that tunes the output power of the LLC converter based on the required power to be supplied to an output load coupled to the LLC converter. The tuning of the output power is based in part on changing the duty cycle of a switching module. In addition, the output power is adjustable by changing a frequency of switching (e.g., a switching cycle of the switching module output). The control system is capable of adjusting amplitude and changing rising slope of a current supplied to the output load by changing the duty cycle and switching cycle of the switching. A piece-wise linear control method is achieved by controlling the duty cycle and switching cycle differently when the input voltage is lower than a crossover voltage than when the input voltage is higher than the crossover voltage.

Abstract: Systems and methods for operating and calibrating electrical parameter measurement devices are provided herein. The devices may include a current sensor that includes a plurality of magnetic field sensors positioned around a measurement area that receive a current carrying conductor under test. The sensor may include a plurality of concentric rings of magnetic field sensors that provide accurate measurements that ignore magnetic fields from conductors or other components outside of the measurement area. The sensors may be used to determine the position of a conductor under test, and such information may be used to produce accurate measurements by accounting for the conductor's position. A calibration system may also be provided that is operative to generate calibration data that is subsequently used to provide more accurate measurements. The calibration data may include one or more lookup tables, coefficients for one or more mathematical formulas, or other types of data.

Abstract: Some systems include an electromagnetic imaging tool configured to receive electromagnetic radiation, a communication interface, a processor in communication with the electromagnetic imaging tool and the communication interface, and a housing. Systems can include a first sensor head having a first plurality of acoustic sensor elements arranged in a first acoustic sensor array. The communication interface can provide communication between the processor and the sensor head via wired or wireless communication. The communication interface can comprise a docking port in communication with the processor and configured to removably receive a corresponding docking mechanism of the first sensor head. Some systems may include a second sensor head having a second plurality of acoustic sensor elements. The second sensor head may be interchangeably connectable to the communication interface and/or the first sensor head.

Abstract: A handheld acoustic imaging tool and method of imaging acoustic signals includes receiving acoustic signals from a scene, identifying a subset of the acoustic signals based on a predetermined condition of an acoustic parameter of the acoustic signals, and generating a display image using electromagnetic image data representative of electromagnetic radiation from the scene. The display image visually indicates a location in the scene corresponding to the subset of the acoustic signals. Generating the display image may further include using acoustic image data representative of the subset of the acoustic signals, wherein the electromagnetic image data and the acoustic image data are shown together in the display image. In some cases, the acoustic image data in the display image may be palettized according to the acoustic parameter, for example according to an amount, an amount of change, or a rate of change, of the acoustic parameter.

Abstract: A temperature measurement system includes an optical resonator, a detector, and a computing subsystem. Light resonates in the optical resonator at resonant wavelengths that vary relative to a temperature in the optical resonator. The detector detects at least two resonant wavelengths of light output from the optical resonator. The computing subsystem determines the temperature of the optical resonator based at least in part on a mathematical operation on the at least two resonant wavelengths of the light output from the optical resonator. The mathematical operation may be a subtraction operation that determines a wavelength difference between two resonant wavelengths. In various implementations, the temperature of the optical resonator is determined based on a mapping of the wavelength difference to the temperature or based on an identified mode of the optical resonator and a mapping of the resonant wavelength to the temperature of the optical resonator in the mode.

Abstract: The present disclosure provides a thermal imaging system that uses the 3D ultrasound imaging system to transmit outgoing ultrasonic waves and receive incoming ultrasonic waves and then to determine distance data of one or more objects of a target scene based on the incoming waves. The thermal imaging system then detects initial temperature values of the one or more objects using an infrared temperature system. Based on the distance data and the initial temperature values, the thermal imaging system determines adjusted temperature values for the one or more objects.

Abstract: Methods of determining one or more shading conditions associated with a structure are provided. A method may include determining a first azimuth of a reference roof edge relative to an orientation of a first image of a structure. The method may further include determining a second azimuth of the reference roof edge relative to a second image captured proximate the structure. In addition, the method may include determining one or more shading conditions associated with the structure based on the first azimuth and the second azimuth. Non-transitory computer-readable media is also disclosed.

Abstract: Some systems include an acoustic sensor array configured to receive acoustic signals, an electromagnetic imaging tool configured to receive electromagnetic radiation, a user interface, a display, and a processor. The processor can receive electromagnetic data from the electromagnetic imaging tool and acoustic data from the acoustic sensor array. The processor can generate acoustic image data of the scene based on the received acoustic data, generate a display image comprising combined acoustic image data and electromagnetic image data, and present the display image on the display. The processor can receive an annotation input from the user interface and update the display image based on the received annotation input. The processor can be configured to determine one or more acoustic parameters associated with the received acoustic signal and determine a criticality associated with the acoustic signal.

Abstract: A structure includes a first substrate and a second substrate. The second substrate includes a device region, and a peripheral region that laterally surrounds the device region. An insulating layer is between the first substrate and the second substrate. An opening laterally surrounds the device region and separates the device region from the peripheral region. The opening extends into the second substrate. An electrical device is in the device region, and a conductive track is in electrical communication with the electrical device. The conductive track is positioned in the opening and the peripheral region.