Abstract: A electric toothbrush comprises a handle and a brush head. A motor is arranged in the handle and a transmission rod is arranged in the brush head. The motor has a rotating shaft, which extends from a casing of the motor. A transmission connection member is arranged between the transmission rod and the rotating shaft of the motor, one end of the transmission connection member is connected with the rotating shaft, the other end is connected with the transmission rod. A sealing member surrounding the rotating shaft is arranged at the rotating shaft extending position of the outer surface of the casing. The sealing member extends from the outer surface of the casing of the motor to the transmission connection member, and a gap between the inside of the sealing member and the rotating shaft constitutes a first cavity. A second cavity is formed between the sealing member and a sleeving cavity of the transmission connection member.

Abstract: A electric toothbrush comprises a handle and a brush head. A motor is arranged in the handle and a transmission rod is arranged in the brush head. The motor has a rotating shaft, which extends from a casing of the motor. A transmission connection member is arranged between the transmission rod and the rotating shaft of the motor, one end of the transmission connection member is connected with the rotating shaft, the other end is connected with the transmission rod. A sealing member surrounding the rotating shaft is arranged at the rotating shaft extending position of the outer surface of the casing. The sealing member extends from the outer surface of the casing of the motor to the transmission connection member, and a gap between the inside of the sealing member and the rotating shaft constitutes a first cavity. A second cavity is formed between the sealing member and a sleeving cavity of the transmission connection member.

Abstract: The disclosure pertains to tuning the impedance of an antenna impedance matching circuit according to operating parameters. The algorithm causes simultaneous adjustment of the impedance of a plurality of variable components of an antenna impedance matching circuit. The algorithm includes selecting between at least one value over a plurality of values in an array. The selected value represents a set of discrete values for each of the plurality of variable components. The plurality of variable components are adjusted to match the selected discrete values. An input signal is applied to the impedance matching circuit after each adjustment, and the magnitude of the signal received in response to the input signal is measured and compared to the magnitude of signal measured for previously set values. A determination is made as to the values of the plurality of variable components that result in the signal with the greatest magnitude.

Abstract: Because the thermal expansion coefficient ("TEC") of glass is small-to-negligible at low temperatures, traditional fiber Bragg grating ("FBG") sensors and long period grating ("LPG") sensors are not adequately sensitive to accurately measure cryogenic temperature changes. However, as demonstrated herein, the integration of a coating around an optical fiber (the coating having a TEC that is greater than that of the fiber alone) can allow the induction of additional thermal strain in the fiber. In this light, a new sensor for cryogenic temperature measurement has been invented that mechanically amplifies temperature transduction within fiber grating sensors. The invention has the benefit of being useful for measuring non-cryogenic temperature changes as well. The thickness of the coating can be optimized.

Abstract: A transducer has been invented that uses specially-oriented gratings in waveguide a manner that allows the simultaneous measurement of physical phenomena (such as shear force, strain and temperature) in a single sensing element. The invention has a highly sensitive, linear response and also has directional sensitivity with regard to strain. The transducer has a waveguide with a longitudinal axis as well as two Bragg gratings. The transducer has a first Bragg grating associated with the waveguide that has an angular orientation .theta..sub.a relative to a perpendicular to the longitudinal axis such that 0.degree.<.theta..sub.a <.theta..sub.max. The second Bragg grating is associated with the waveguide in such a way that the angular orientation .theta..sub.b of the grating relative to a perpendicular to the longitudinal axis is (360.degree.-.theta..sub.max)<.theta..sub.b <360.degree.. The first Bragg grating can have a periodicity .LAMBDA..sub.a and the second Bragg grating can have a periodicity .