A quartz thermometer adapted to measure the ambient temperature through detection of a change in the resonance frequency of a quartz resonator due to change in the temperature, wherein a quartz wafer of 0.02 to 0.2 mm thickness is cut from a region of a quartz within -30.degree. to -70.degree. in terms of rotation angle about the X axis of the quartz thereby to form a quart resonator within a range of between -15.degree. to +15.degree. in terms of angle of rotation about the Z' axis within the p...

The invention provides a stabilized frequency characteristic over a wide temperature range. A quartz resonating piece is provided such that an electrical axis of quartz corresponds to an X axis, a mechanical axis of the quartz corresponds to a Y axis, and an optical axis of the quartz corresponds to a Z axis. The quartz resonating piece includes a quartz plate having a side that is parallel to an X'axis set by clockwise rotation of the X axis around the Z axis by an angle equal to or greater tha...

A quartz heater is provided for heating fluids or objects. The heater comprises a member, for example, a quartz glass tubular or non-tubular member, with a low-emissivity conductive coating that produces heat when connected to external power. The fluid can be heated as it passes through the tubular member. If the member is not completely coated, then heat radiates toward the center of the member, pass through its uncoated portion, and then onto objects for heating.

Quartz is purified by removing mineral impurities, particularly alkali metal impurities, from within the quartz crystal lattice structure. According to the disclosed process, quartz crystals are subjected to a pretreatment that removes surface bound impurities and then contacted with gaseous HCl at a temperature of from 800.degree. C. to 1600.degree. C. for a period of time of from a few minutes to several hours, thereby diffusing the mineral impurities to the quartz crystal surface where they f...

Quartz is purified by removing mineral impurities, particularly alkali metal impurities, from within the quartz crystal lattice structure. According to the disclosed process, quartz crystals are subjected to a pretreatment that removes surface bound impurities and then contacted with gaseous HCl at a temperature of from 800.degree. C. to 1600.degree. C. for a period of time of from a few minutes to several hours, thereby diffusing the mineral impurities to the quartz crystal surface where they f...

In a quartz barometer untilizing the temperature dependence of the resistance of a quartz oscillator at resonance, the present invention is directed to provide a circuit which compensates for the temperature change of the resistance at resonance by connecting a temperature-dependent resistor in series with a quartz oscillator thereby enabling said quartz barometer to measure gas pressure much more accurately.

A quartz unit is arranged to permit its automatic manufacture. The quartz unit includes a quartz vibrator; a pair of opposed terminal metal fittings each consisting of a stem part, branch parts protruding from one end of the stem part on two sides thereof to form a Y shape and support parts protruding from the fore ends of the branch parts to carry jointly the quartz vibrator; electrodes of the quartz vibrator connected to the terminal metal fittings through the support parts; and a container co...

A quartz crystal thermometer in which a standard frequency is generated by a first oscillator circuit incorporating a quartz crystal element and in which a frequency which varies with temperature is generated by a second circuit incorporating the same quartz crystal element. Two electrode pairs are provided on the single quartz crystal element in order to excite two different modes of vibration of the quartz crystal element, with the metallization being on only one or on both of the major faces ...

A quartz thermometer which emits a signal, the frequency of which is a substantially linear function of temperature. The thermometer comprises a quartz resonator provided with electrodes disposed on the margins of the upper and lower main surfaces, parallel to the length direction. The electrodes are supplied with electric current so as to cause the resonator to vibrate torsionally. The length of the resonator is substantially parallel to the X axis of the quartz crystal. An electronic circuit i...

An object of the present invention is to provide a quartz resonator unit and a quartz oscillator having a small size and a light weight and having the capability of oscillating in the overtone mode, and also to provide a quartz element for use in the quartz resonator unit and quartz oscillator. Thus, a further object is to determine the optimum width-to-thickness ratio of the quartz element at which the quartz element having a width less than 1.5 mm and a length less than 4.7 mm does not show co...