JPS63138219A - Blackbody furnace - Google Patents

Abstract

PURPOSE:To improve a temperature distribution by burying a heating wire inserted through an insulating pipe, into a groove part formed in the outside periphery except the bottom face of a cylindrical metallic block having a cavity part in the inside in one end opening. CONSTITUTION:In the longitudinal direction of an opening part side of the outside peripheral surface of a metallic block 1, plural partition walls 1a are formed, and between these partition walls 1a, plural first groove parts are formed, and the first heating wires 3a inserted through plural insulating pipes 2a are buried therein. Also, in the longitudinal direction of the bottom part side, plural partition walls 1b and plural second groove parts between them are formed, and in these groove parts, the second heating wires 3b inserted through plural insulating pipes 2b are buried. These heating wires 3a, 3b are divided completely in the center part 1c of the metallic block 1, and heated by a power source from an outside wire, respectively. A standard thermometer inserting hole 1e is housed in an outside cylinder 4 having a cylinder 4a and a cover 4b and a soaking property is raised. In such a way, the heating wires 3a, 3b are provided on not the furnace bottom of the metallic block 1 but the outside periphery, and also, separated into the opening side and the bottom part side of the metallic block 1, therefore, a temperature distribution is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a blackbody furnace used for calibration of radiation 1/1.

[Prior art 1] In Japanese Patent Application No. 57-43952, as shown in FIG. A good small blackbody reactor has been proposed.

[Problems to be solved by this invention] However,
Due to the heat generated by the heating element 20 at the bottom, when used in a low temperature range such as 500° C. or lower, the bottom side of the furnace becomes higher, resulting in a concentration distribution, which makes it impossible to obtain a suitable blackbody furnace.

In view of the above points, an object of the present invention is to provide a blackbody furnace with a favorable temperature distribution even when used in a low temperature range.

[Means for Solving the Problems] The present invention is a blackbody furnace in which a photothermal wire inserted through an insulating tube is embedded in a groove formed on the outer periphery of a cylindrical metal block except for the bottom surface.

[Example] FIG. 1 is a bottom explanatory diagram of a metal block according to the present invention,
FIG. 2 is a partially cross-sectional explanatory diagram, and FIG. 3 is a partially cross-sectional explanatory diagram of the outer cylinder.

In the figure, reference numeral 1 denotes a metal block, and a plurality of partition walls (projection grooves) 1a and a first groove *m are formed between the partition walls 18 in the direction f on the frontage side of the outer peripheral surface of the block. In the groove? ! A first heating wire 3a inserted through several T8 edge tubes 2a is buried.

Further, a plurality of partition walls 1b and a plurality of second grooves are formed between the partition walls 1b on the bottom side, and a second heat generating pipe is inserted into the second groove. line 3b
is buried. These two first and second heating wires 3
a and 3b are completely separated by the central IC of the metal block 1, and each generates heat using an external power source.

In addition, 1e is jfA+1! With the thermometer insertion hole, the entire metal block 1 is shaped like a circle @ 4a and a container 4b as shown in Fig. 3.
It may also be used by storing it in an outer cylinder 4 having an outer tube 4 to improve heat uniformity.

In other words, the hot wires 3a and 3b are not provided at the bottom of the metal block 1, but are placed on the outer periphery of the metal block 1, and are separated into the opening side and the bottom side of the metal block 1, so that the temperature rise at the bottom and center part 1C is reduced. Overall, a blackbody furnace with even better temperature distribution can be achieved.

[Effects of the invention] This defense is based on the fact that the light heating wire is not provided on the bottom of the metal block, but only on the outer periphery, and is divided into two zones. As a result, the temperature distribution becomes extremely good. Especially at 500°C
The following J:C is suitable for blackbody furnaces in the low temperature range.

[Brief explanation of the drawing]

1, 2, and 3 are configuration explanatory diagrams showing one embodiment of the present invention, and FIG. 4 is an explanatory diagram of a conventional example. 1... Metal block [1 piece, 2a, 2b... Insulating tube,
3a, 31J...heating wire

Claims (1)

[Claims] 1. A cylindrical metal block with an opening at one end and a hollow inside, a groove formed on the outer periphery of the metal block except for the bottom surface, and an insulating tube inserted into the groove and buried. A blackbody furnace characterized in that it is equipped with a heating wire. 2. The blackbody furnace according to claim 1, wherein the groove on the outer periphery of the metal block is divided into an opening side and a bottom side, and a heating wire is provided in each divided groove.