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Infrared spectrophotometer

An infrared spectrophotometer technology, applied in spectrometry/spectrophotometry/monochromator, analytical materials, optical radiation measurement, etc., can solve the problem that infrared spectrophotometer cannot be used

Inactive Publication Date: 2019-02-05
SHIMADZU SEISAKUSHO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the case of a disconnection of the heating element, there is a problem that the ceramic heater itself must be replaced, and an infrared spectrophotometer cannot be used for analysis until the replacement

Method used

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Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0030] 1. The composition of the infrared spectrophotometer

[0031] figure 1 It is a schematic diagram showing a configuration example of an infrared spectrophotometer according to an embodiment of the present invention. The infrared spectrophotometer is, for example, a Fourier transform infrared spectrophotometer (FT-IR), including an electric heater 1, an interferometer 2, a sample chamber 3, a detector 4, a PWM control circuit 5, a controller 6 and a display unit 7 Wait.

[0032] The electrothermal heater 1 is made of, for example, a ceramic heater. Specifically, the outer side of the heating element made of resistors is covered with ceramics such as silicon carbide (SiC) or silicon nitride (SiN), thereby forming the electrothermal heater 1 . Examples of the heating element include metal heating elements such as nickel-chromium, iron-chromium-aluminum, molybdenum, tungsten, platinum, and molybdenum disilicide, but are not limited thereto, and may be non-metallic heating...

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Abstract

Provided is an infrared spectrophotometer that uses an inexpensive configuration to make it possible to provide a notification of the appropriate replacement time for an electric heater. This infraredspectrophotometer is provided with an electric heater 1, a PWM control circuit 5, a state detection unit 61, and a notification processing unit 62. The electric heater 1 is a light source that irradiates infrared radiation. The PWM control circuit 5 carries out PWM control so that the current supplied to the electric heater 1 is constant. The state detection unit 61 detects the state of the electric heater 1 on the basis of the variation in the duty cycle during PWM control. The notification processing unit 62 reports the result of the detection by the state detection unit 61.

Description

technical field [0001] The present invention relates to an infrared spectrophotometer having an electric heating heater as a light source for irradiating infrared light. Background technique [0002] In an infrared spectrophotometer, an electrothermal heater such as a ceramic heater is used as a light source (see, for example, Patent Document 1 below). In such an infrared spectrophotometer, the infrared light irradiated from the electric heating heater is reflected by the fixed mirror and the movable mirror, thereby causing interference between the light reflected on the fixed mirror and the light reflected on the movable mirror. The interference light is irradiated on the sample. [0003] The ceramic heater is formed by covering the outside of a heating element made of a resistor with ceramic such as silicon carbide (SiC) or silicon nitride (SiN). When only the heating element is used, the heating element quickly oxidizes and deteriorates. However, by covering the outside...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J3/10G01N21/01G01N21/35
CPCG01J3/10G01J3/0264G01J3/027G01J3/0286G01J3/108
Inventor 和久田真也
Owner SHIMADZU SEISAKUSHO CO LTD