Abstract: Apparatuses and methods for measuring and characterizing ultrasound using thermoacoustic sensors are provided. Thermoacoustic sensors can include heat flux sensors for detecting a temperature difference (between the front and back of the heat flux sensor) and an absorber layer attached to the heat flux sensor for absorbing ultrasound, converting it to heat, and also acting as an acoustic impedance matching layer. An heat sink can also be used. In some embodiments, thermoacoustic sensors can be arranged into an acoustic integrating sphere and face inward to form a cavity. The sphere can have an opening to the cavity, wherein ultrasound emitted through the opening can cause a temperature difference that can be detected by the thermoacoustic sensors. These apparatuses and others can provide for methods of measuring ultrasound power and/or methods of determining an ultrasound profile as the angular distribution of emitted ultrasound power generated by an ultrasound transducer.

Abstract: A spirit type level that may be used to plumb any vertical pole or post, may be used to horizontally set an object and may also be used to quickly and easily set a pipe at a selected slope of between 0 and 3 percent. The spirit type level of the invention includes a plurality of differently oriented spirit vials that are secured within the level body in a manner such that, if any one of the spirit vials become broken, or otherwise damaged, it can be easily replaced and the level need not be discarded. The spirit type level of the invention can be quickly and easily removably attached to the object to be leveled thereby freeing the hands of the user to position the object.

Abstract: A thickness detection device comprises: a feed roller (130), a thickness detection unit (110,210) and a thickness measurement unit (120,220).

Abstract: A line marker includes a housing having a receiving cavity and an opening communicating with the receiving cavity, a retracting unit supported within the receiving cavity of the housing, an operating cable having an inner coupling end coupling with the retracting unit and an outer control end extending out of the receiving cavity through the opening, and an indicating element container supported in the housing, wherein the indicating element container includes an absorbing element disposed therein to absorb the indicating element, wherein the operating portion of the operating cable contacts with the absorbing element to evenly apply the indicating element along the operating cable when the operating cable is pulled out from the housing for marking a straight line on a surface.