JPH0143621Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a light source for an infrared spectrometer, and more particularly to an infrared light source in which a high melting point heating element is wound around a heating element core made of alumina ceramic.

Conventionally, heating elements such as silicon carbide (product name GLOVER or SILICONIT) and nichrome wire have been used as light sources for infrared spectrometers, but none of them are satisfactory in terms of temperature, emissivity, lifespan, power consumption, etc. It's not a thing. Therefore, there is a strong desire to realize a light source for an infrared spectrometer that has a temperature as high as possible, an emissivity close to 1, a long life, and low power consumption.

An object of the present invention is to provide a light source for an infrared spectrometer with a novel configuration in consideration of the above points. That is, in the light source for an infrared spectrometer according to the present invention, the heating element core is formed of an alumina ceramic tube with a special structure, and a groove is formed along the axial direction on the outer peripheral surface of the alumina ceramic tube. A long and narrow opening is provided along the axial direction in a part, and a high melting point heating element such as platinum or its alloy is wound along the outer peripheral groove of the alumina ceramic tube, so that infrared radiation is extracted from the opening. It is characterized by this.

Embodiments of the present invention will be described in more detail below with reference to the drawings. FIG. 1 is a perspective view showing a heating element core 1 of a light source according to the present invention, and this core 1 is a ceramic tube made of high-purity alumina.
A uniform groove 3 is formed along the axial direction on the outer peripheral surface of this alumina biscuit tube 2, and at the same time, a part of the groove 3 is also cut out along the axial direction to form an opening 4 for extracting infrared rays. has been done. As shown in the plan view of FIG. 2, a high melting point heating element 5 made of platinum or an alloy thereof is wound around the outer periphery of the heating element core 1 obtained by processing the alumina ceramic tube 2 in this manner. The heating element 5 is an alumina ceramic tube 2
It is wound along the groove 3 provided on the outer peripheral surface of the
At this time, grooves that match the grooves 3 are formed on the upper and lower end surfaces of the ceramic tube 2 to facilitate winding.
The heating element core 1 around which the heating element 5 is wound is housed in a case 6 as shown in FIG. 3 via a high-quality heat insulating material. At this time, the heating element core 1 is arranged so that its opening 4 coincides with the window 7 of the case 6, and the height of the window 7 is somewhat shorter than that of the opening 4.
The width has a somewhat wide dimension. Although not shown, a lead wire is led from the heating element housed in the case to the outside of the case via a suitable terminal, and a voltage is applied from an external power source through this lead wire. When current flows through the heating element 4, the heating element core 1 is heated to around 1300°C, and infrared radiation is extracted through the opening 4 of the heating element core and the window 7 of the case.

As an example, when a light source with a platinum wire wrapped around the core was made and the temperature was set to approximately 1000℃, 1200℃, and 1300℃, the actual measured values of the relative intensity spectrum for the nichrome wire light source at approximately 1000℃ are shown in Figure 4. .

As described above, according to the present invention, a high melting point heating element made of platinum or its alloy is wound around a heating element core made of alumina ceramic, and the heating element is formed along the axial direction on a part of the alumina ceramic tube constituting the core. By extracting infrared radiation from the opening, an excellent light source for an infrared spectrometer can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the heating element core of the light source according to the present invention, Fig. 2 is a plan view showing the heating element core with the heating element wrapped around it, and Fig. 3 shows a case housing the heating element core. The perspective view, FIG. 4, is a spectrum diagram showing the relative intensity of the light source in one embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Heating element core, 2... Alumina ceramic, 3... Groove, 4... Opening, 5... Heating element, 6
...Case, 7...Window.

Claims (1)

[Scope of utility model registration request] In a light source in which a heating element is housed in a case via a heat insulating material, and infrared rays are emitted by passing a current through the heating element, the heating element core is composed of an alumina ceramic tube, and the outer peripheral surface of the ceramic tube is At the same time as forming a groove along the axial direction, a long and narrow opening is formed along the axial direction in a part of the ceramic tube, and a high melting point heating element such as platinum or its alloy is wound along the outer circumferential groove of the ceramic tube. A light source for an infrared spectrometer, characterized in that radiated infrared rays are extracted from the opening.