JPH076751U - Total reflection absorption spectrum measuring device - Google Patents

Abstract

(57) [Summary] [Purpose] Without cutting or cutting the sample,
Another object of the present invention is to provide a total reflection absorption spectrum measuring apparatus capable of measuring an infrared absorption spectrum by the ATR method even when the sample is left in the field without moving. [Structure] An ATR prism closely attached to a measurement sample, an incident-side infrared optical fiber that guides infrared light from an infrared spectrophotometer to the ATR prism, and infrared light from the incident-side infrared optical fiber between the ATR prism and the sample. Condensing optical system for condensing on the interface, condensing optical system for condensing reflected light from the interface between the ATR prism and the sample on the reflection side infrared optical fiber, guiding reflected light from the ATR prism to the infrared spectrophotometer A total reflection absorption spectrum measuring device equipped with a measuring head in which a reflection-side infrared optical fiber is integrated by a holder.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an apparatus for measuring an infrared absorption spectrum by the ATR method, which is widely used for qualitative analysis and identification analysis of various substances including organic substances such as polymer materials.

[0002]

[Prior art]

 The ATR method utilizing total reflection is known as one of the methods for measuring an infrared absorption spectrum. In the ATR method, an ATR prism having a high refractive index is brought into close contact with the sample, the sample is irradiated with infrared light through the ATR prism, and the light emitted from the ATR prism is spectrally analyzed.

When infrared light is incident on the prism under a condition of a certain angle or more due to the relationship between the refractive index of the ATR prism and the sample, the infrared light does not come out of the ATR prism and the contact surface between the ATR prism and the sample. At that time, total reflection occurs, but at that time, infrared light bleeds to the sample side for a short distance, so if there is absorption of infrared light in the sample, the reflected light will be attenuated and the absorption spectrum of the sample can be obtained. it can.

Since the ATR method can measure the absorption spectrum of a very thin sample portion in contact with the ATR prism, even a thick sample or a sample with low transparency can be measured if it can be brought into close contact with the ATR prism. It has the advantage that it can.

[0005]

[Problems to be solved by the device]

 In the conventional ATR method, since the measurement is performed using the ATR measuring device provided in the sample chamber of the infrared spectrophotometer, it has an appropriate size that can be put in the ATR measuring device. Since it is necessary to cut the sample, it is impossible to measure a sample that cannot be cut, a sample that cannot be transported to the infrared spectrophotometer, etc. There was a problem.

The present invention makes it possible to measure an infrared absorption spectrum by the ATR method without cutting the sample as it is, or even without moving the sample in the field. The purpose is to provide a measuring device.

[0007]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the total reflection absorption spectrum measuring apparatus of the present invention is equipped with an ATR prism that is in close contact with a measurement sample, an incident side infrared optical fiber that guides infrared light from an infrared spectrophotometer to an ATR prism, and an incident side optical fiber. A collection optical system that collects infrared light from the side infrared optical fiber on the interface between the ATR prism and the sample, and a collection optical system that collects reflected light from the interface between the ATR prism and the sample on the reflection side infrared optical fiber. The optical head and the infrared optical fiber on the reflection side that guides the reflected light from the ATR prism to the infrared spectrophotometer are integrated by a holder to form a measuring head. Such a measuring head is integrally attached to the infrared spectrophotometer or detachably attached to form a total reflection absorption spectrum measuring device.

[0008]

[Action]

 In the total reflection absorption spectrum measuring apparatus of the present invention configured as described above, the ATR prism integrated with the infrared optical fiber is adhered to the sample outside the infrared spectrophotometer, and the infrared spectrophotometer The infrared light is guided from the infrared optical fiber to the ATR prism portion. The infrared light is totally reflected at the interface between the ATR prism part of the infrared optical fiber and the sample, and the reflected light is guided again to the infrared spectrophotometer by the infrared optical fiber to measure the infrared absorption spectrum of the sample. .

[0009]

【Example】

 A total reflection absorption spectrum measuring apparatus of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of a measuring head which is an essential part of the present invention.

Reference numeral 2 denotes an ATR prism that is in close contact with the measurement sample 14 and is made of a material that is transparent in the infrared region and has a high refractive index. As the material of the ATR prism 2, for example, KrS-5, ZnS, Ge, Si or the like can be used.

An incident-side infrared optical fiber 4 guides infrared light from an infrared spectrophotometer (not shown) to the ATR prism 2. A condenser optical system 6 condenses infrared light from the incident-side infrared optical fiber 4 on the interface between the ATR prism 2 and the sample 14, and reflects light reflected from the interface between the ATR prism 2 and the sample 14 again. Collect light. The condensing optical system 6 of this embodiment is a Schwarzschild type reflecting objective, but other reflection optical systems such as a Newton type reflecting objective, as well as infrared regions such as KrS-5, ZnS, Ge and Si. It is also possible to apply a refractive optical system formed of a transparent material.

Reference numeral 8 denotes a notch mirror, which guides the condensed reflected light from the interface between the ATR prism 2 and the sample 14 to the reflection-side infrared optical fiber 10. The reflection side infrared optical fiber 10 guides the reflected light from the ATR prism 2 to an infrared spectrophotometer.

As the infrared optical fibers 4 and 10, those formed of KrS-5 and those formed of a mixed crystal of AgCl and AgBr can be used.

A holder 12 integrally holds the ATR prism 2, the condensing optical system 6, the cutout mirror 8 and the infrared optical fibers 4 and 10.

[0015]

[Effect of device]

 Since the present invention is configured as described above, it is possible to measure the infrared spectrum by the ATR method simply by bringing the measuring head to the sample and pressing it against the measurement site. It is not necessary to prepare a sample piece, and the measurement can be performed as it is. In addition, since it is not necessary to bring the sample to the sample chamber of the infrared spectrophotometer, it is possible to measure directly on site.

[Brief description of drawings]

FIG. 1 is a view showing an embodiment of a measuring head which is a main part of a total reflection absorption spectrum measuring apparatus of the present invention.

[Explanation of symbols]

2 ... ATR prism 4, 10 ... Infrared optical fiber 6 ... Condensing optical system 8 ... Notch mirror 12 ... Holder 14 ... Measurement sample

Claims (1)

[Scope of utility model registration request] 1. An apparatus for irradiating a sample with infrared light from an infrared spectrophotometer and again guiding reflected light from the sample to the infrared spectrophotometer to measure its infrared absorption spectrum ATR prism that is closely attached, incident-side infrared optical fiber that guides infrared light from the infrared spectrophotometer to the ATR prism, and infrared light from the incident-side infrared optical fiber is ATR
Condensing optical system for condensing on the interface between the prism and the sample, ATR
A focusing optical system that collects the reflected light from the interface between the prism and the sample on the reflecting side infrared optical fiber, and the reflecting side infrared optical fiber that guides the reflected light from the ATR prism to the infrared spectrophotometer is integrated by the holder. A total reflection absorption spectrum measuring apparatus comprising a measuring head.