Abstract:
A device containing a temperature-sensitive material comprises a first part containing the material, a second part which engages the first part and allows, or can be disengaged or displaced to allow, the material to be dispensed or utilised, a locking means, and a temperature-sensitive activator for the locking means that is activated at a predetermined temperature, and thereby irreversibly prevents the material from being dispensed or utilised should it become frozen or exposed to temperatures below a predetermined limit.
Abstract:
A temperature monitoring apparatus for high-voltage or medium-voltage components has a transducer which can produce a mechanical signal, which is dependent on the temperature of the component to be monitored. The mechanical signal is transmitted to an electrically isolating transmission element, for example in the form of a rod, and from the transmission element to a movement sensor. The transmission element can be arranged in an electrically isolating hollow body. This arrangement allows the movement sensor to be isolated from high voltages. The apparatus is composed of robust components, and can have a long life.
Abstract:
A method of remotely measuring the temperature of a body, such as a semiconductor wafer, whose transparency varies with both wavelength and temperature and is characterized by an optical absorption edge. The body is illuminated at wavelengths on either side of the optical absorption edge. Based on the measured reflectivity at wavelengths shorter than the optical absorption edge, the direct reflectivity at wavelengths longer than the optical absorption edge is predicted and used to estimate the component of total reflectivity, at wavelengths longer than the optical absorption edge, which corresponds to propagation through the body and reflection back through the body. Light reflected from the body, measured in an "active" channel, is distinguished from light emitted passively by the body and measured in a "passive" channel. In the case of an opaque body, this allows the estimation of the emissivity of the body, and a temperature estimate based on Planck's law.
Abstract:
A device for measuring and signaling the internal temperature of a container. The device includes an energy source, an informing device electrically connected to the energy source, and a bimetallic element electrically connected to the energy source. The bimetallic element is configured to deform based upon a variation in the internal temperature of the container. The device further includes a selector configured to provide for the selection of a predetermined temperature valve and having a conductive portion electrically connected to the informing device. The bimetallic element is configured to contact the conductive portion when the internal temperature of the container reaches the predetermined temperature value, thereby creating a closed electrical loop that actuates the informing device.
Abstract:
A thermometer includes a housing with a C-shaped window therein and a temperature scale adjacent to the window. A member within the housing has a colored or shaded region with a boundary visible through the window. The colored region is sufficiently large so that it fills the window from the lower side of the temperature scale up to the boundary. The boundary is moved relative to the temperature scale by a bimetal coil spring. The boundary and the colored region indicate the temperature being read by the thermometer. In one version of the invention, the window extends in an arc of about 180.degree., the member is a substantially planar disk, and the colored region is a semi-circular portion of the disk. The disk is mounted within the housing on a shaft, and the disk rotates relative to the shaft. The thermometer is easily readable under a variety of viewing conditions, especially adverse viewing conditions.
Abstract:
A temperature sensor is made of optical fiber into which quasi-sinusoidal microbends have been permanently introduced. In particular, the present invention includes a graded-index optical fiber directing steady light through a section of the optical fiber containing a plurality of permanent microbends. The microbend section of the optical fiber is contained in a thermally expansive sheath, attached to a thermally expansive structure, or attached to a bimetallic element undergoing temperature changes and being monitored. The microbend section is secured to the thermally expansive sheath which allows the amplitude of the microbends to decrease with temperature. The resultant increase in the optical fiber's transmission thus allows temperature to be measured. The plural microbend section of the optical fiber is secured to the thermally expansive structure only at its ends and the microbends themselves are completely unconstrained laterally by any bonding agent to obtain maximum longitudinal temperature sensitivity. Although the permanent microbends reduce the transmission capabilities of fiber optics, the present invention utilizes this phenomenon as a transduction mechanism which is optimized to measure temperature.
Abstract:
A snap acting control member (10, 10b) having high actuating temperatures comprises metal layers metallurgically bonded together with a low expansion (12) and a relatively high expansion layer (14) each having similar moduli of elasticity and the low expansion layer being formed of a precipitation hardenable stainless steel so that after forming into a dished shaped configuration to make the member snap acting the low expansion layer is heat treated to increase the strength. The control member can be used solely to sense temperature or it can be used as an electrical current carrying member. When used in the latter manner, the electrical resistivity of the member can be adjusted by interposing a selected layer (16) between layers (12) and (14) to thereby increase or decrease the resistivity of the member (10b) depending on the particular metal chosen for the interlayer. An electrical switch (24) is shown in which a snap acting member is used as a sensor and another electrical switch (48) is shown in which the snap acting member is a current carrying member.
Abstract:
A temperature sensing apparatus (10) adapted for sensing the temperature of a food item in an oven includes a body (12) which encloses a chamber (34). The chamber houses an indicator (20) which is viewed through a glass pane (28). Slight amounts of water vapor that infiltrate into the chamber during washing are safely vented by a pressure relief valve (36) having a unitary body of resilient material. The check valve includes a membrane portion (40) with a diametrically extending slit (46) therethrough. The slit remains closed under most conditions. When pressure builds in the chamber during heating due to rapid expansion of infiltrated water vapor, the membrane portion deforms sufficiently to open the slit before the pressure reaches a level that may fracture the glass pane or cause other damage. When the pressure falls, the membrane portion returns to its initial position closing the slit.
Abstract:
A thermometer for measuring a surface temperature having in its lower portion a spiral bimetallic strip mounted centrally on the lower end of a spindle whose upper end carries an indicating pointer. The spindle is journaled in an elongated tubular stem carrying at its upper end a dial face bearing angularly spaced indicia with which the pointer cooperates for indicating temperature. The lower end of the stem has fixed thereto a cup-shaped shield, downwardly open, surrounding the bimetallic strip, and including means restraining angular movement of the outer end of the bimetallic strip, but permitting limited axial movement of the strip and spindle relative to the stem and shield.
Abstract:
An indoor/outdoor thermometer comprised of separate indoor and outdoor temperature indicating units is disclosed for simultaneously providing a relative temperature indication on two sides of a sheet of transparent material in conjunction with a single graduated scale disposed on one of the units. Alignment surfaces are provided to align the indoor unit with respect to the outdoor unit and with respect to the graduated scale, and means are provided to attach the indoor temperature indicating unit relatively independently of the outdoor temperature indicating unit. In addition, moisture control means may be provided.