Abstract:
A method of and apparatus for measuring thermal irradiation. The apparatus, in the form of a thermal radiometer, comprises a housing, a shutter mounted on a wall of the housing, a thermally conductive element positioned behind the shutter, the conductive element having a black surface facing the shutter, and means for measuring the temperature of the conductive element. The outer face of the shutter will be thermally reflective, and the radiometer will include means for calculating the rate of temperature rise of the conductive element after opening the shutter and an indica- to responsive to the calculating means for displaying a value which is proportional to the rate ot temperature rise The method for measuring thermal irradiation comprises positioning a thermallv conductive element having a black surface behind a shutter with the black surface facing the shutter. allowing the element to assume ambient temperature opening the shutter anc measuring the subsequent rate of temperature rise of the element and using the rate of temperature rise to determine the level of irradiation.
Abstract:
The invention relates to a sensor for the radiation-pyrometric measurement of the temperature of an object in high ambient temperatures inside a drier or the like. The sensor consists of a heat-conducting housing (1) with a window (2) transparent to heat radiation and at least one thermopile (3, 33) in the housing (1) consisting of thermocouples (18) of interconnected elements (18a, 18b) of mutually thermo-electrically active materials. A first radiation-sensitive connection (4, 34) between the elements (18a, 18b) faces the window (2) and they are distributed over a basic surface (25) of a substrate (5) facing the window (2). The substrate (5) consists of a heat-resistant and insulating material and has through apertures (19) in the basic area (25), each of which accepts an element (18a, 18b) of the thermocouples (18). The second reference connections (6, 36) of the thermocouples (18) are in a region shielded from the heat radiation.
Abstract:
A thermopile radiation detector comprises thermoelements developed on a silicon chip. The silicon chip is made by micromechanical processes used in the manufacture of integrated circuits. An originally relatively thick, plate-shaped silicon chip (1) is pared down, leaving a relatively thick border (2) and a relatively thin, meander- or spiral-shaped strip (3) joined at one end (13) only to the border (2). The so-called ''cold'' thermocontacts are located on the border (2) of the chip (1) in the region of the end (13) of the strip (3) and the so-called ''hot'' thermocontacts are located on the other, free end (14) of the thin strip (3). As a result of this construction, a relatively large thermoelectric signal is produced for a given infrared radiation even for a relatively small chip surface.
Abstract:
A pyrgeometer for measuring infra-red radiation having a sensor which includes a thermopile comprising a plurality of thermocouple junctions (22) between at least two metallic compositions alternating along a thermocouple track (21) deposited on one surface of a planar substrate (13), hot junctions being located in infra-red absorbing regions of the substrate and cold junctions being located in infra-red reflecting regions of the substrate, the substrate being mounted across an essentially circular orifice of a body (10) acting as a heat sink and adjacent hot and cold junctions being located on the substrate substantially equidistant from the heat sink.
Abstract:
The instrument consists of two parallel inter-insulated plate elements (1 and 2) on figure 1, between the two plates and in thermal contact with both two peltier-elements (3 and 4) have been affixed. This sensor is connected with a control and measuring device of known construction over the input terminals of which there is applied a voltage that is generate across the poles of one of the peltier-elements when, because of radiant asymmetry, a temperature difference arises between (1 and 2). In the control unit this voltage is transformed in a known way to a current proportional to the voltage which is led through the other peltier-element. The temperature difference thus occured between the two sides of the peltier-element will, when the element is rightly turned, neutralize the temperature difference between the two plate elements caused by the radiation so that these elements will adopt the same temperature. The required current is proportional to the radiant asymmetry perpendicularly at the sensor element.