Metal identification meter employing the thermoelectric effect
阅读：732发布：2021-03-03
专利汇可以提供Metal identification meter employing the thermoelectric effect专利检索，专利查询，专利分析的服务。并且A metal comparator employing the thermoelectric effect of dissimilar metals joined in a circuit with a voltage indicator and employing two probes of identical metallic composition, one of the probes being heated to a temperature greater than ambient temperature.，下面是Metal identification meter employing the thermoelectric effect专利的具体信息内容。
1. In an identification meter for identifying metallic objects and including in an electrical circuit a voltage indicator having two separate electrically conductive probes adapted to contact a metallic specimen and join it in said electrical circuit, one of said probes being heated to a temperature higher than the temperature of said metallic specimen and the other of said probes, the improvement wherein said two probes are of identical metallic composition and each junction between a probe and the metallic specimen generates an individual electromotive force characteristic for such junction at its existing temperature, said individual electromotive forces being identical in polarity hence productive of a net electromotive force in the circuit representative of the subtractively combined individual electromotive forces and indicative of the metallic composition of said specimen, said probes having pointed tips for contacting said specimen whereby the area of contact between each of said probes and said specimen is sufficiently small as will result in minimal thermal transfer between said probes and said specimen.
2. An identification meter for metallic objects under conditions of varying ambient temperature and comprising in combination, a voltage indicator including two separate electrical leads extending therefrom, a probe electrically joined to the unattached end of each of said electrical leads, each probe comprising respective contact elements electrically joined with respective ones of said electrical leads and having pointed tips adapted to join the metallic object under study in an electrical circuit with said voltage indicator, one of said probes including a resistance heating element disposed in intimate heat-communicating relationship with the contact of said probe, means supplying electrical power to said resistance heating element to create a predetermined constant heat in the same and resultant heating of said contiguous contact of said probe to a constant temperature higher than the temperature of the metallic object under study and the other of said probes, wherein said probes are of identical metallic composition and each junction between a probe and the metallic object under study generates an individual electromotive force characteristic for such junction at its existing temperature, said individual electromotive forces being identical in polarity hence productive of a net electromotive force in the circuit representative of the subtractively combined individual electromotive forces and indicative of the composition of said metallic object and the area of contact between each of said contact element of each of said probes and said specimen being sufficiently small as will result in minimal thermal transfer between each of said contact elements and said specimen.
3. The invention of claim 2 wherein said voltage indicator comprises a millivoltmeter and said net emf is visually displayed by said millivoltmeter.
4. The invention of claim 2 wherein the probe disposed contiguously to said resistance heating element comprises a tubular housing adapted to receive in one of its open ends said resistance heating element and at least a substantial part of said contact element, and including a plurality of radial fins extending longitudinaLly along the outermost surface of said housing a substantial distance from that end thereof encompassing said heating and contact elements, and a thermally and electrically insulative sleeve circumscribing and contacting said fins to define a plurality of open conduits between said sleeve and said housing.
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