JPH11271413A - Sample temperature control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sample temperature control device wherein pulsating flow and noise of the compressed air are suppressed and the flow rate of the air discharged to a sample side is controlled. SOLUTION: The sample temperature is controlled by supplying air from a compressor 1 around a sample which is measured through a heater 4. Here, the air from the compressor 1 is split into plural flows, and a part of it is made to flow into the vicinity of the sample through the heater 4, while remaining part exhausted outside through a pipe 7 of soft material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a sample temperature control device used in an electron spin resonance (ESR) device or a nuclear magnetic resonance (NMR) device.

[0002]

2. Description of the Related Art ESR and NMR are used in a sample temperature controller.
It is required that the measurement sample be controlled to an arbitrary temperature within a wide range from -170 ° C to + 200 ° C. Specifically, a temperature sensor is arranged near the sample to detect the temperature immediately adjacent to the sample, to obtain a difference signal between the obtained temperature detection signal and the set value signal, and to determine the heater temperature of the heater based on the difference signal. The control is performed to produce a gas having a desired temperature, and the gas is flowed around the sample to control the temperature of the sample.

In this case, when controlling the sample temperature from around room temperature to a low temperature side, a refrigerant such as liquid nitrogen stored in a dewar is used as a gas source, whereas the sample temperature is controlled from around room temperature to a high temperature side. It is common to use air sent by a compressor as a gas source. And when air is the gas source,
The air from the compressor was led directly to the heater, and was allowed to flow around the measurement sample via the heater.

FIG. 1 shows a flow path system of a temperature control gas at the time of temperature control on a high temperature side of a conventional sample temperature control device. The air sent from the compressor 1 is
After the dust and the like are removed by the filter 2, the dust is discharged into the heater 4 through the long pipe 3 made of soft vinyl, and
After the temperature is controlled by the above, it is sprayed on the measurement sample 5.

[0005]

However, since the pump incorporated in the compressor is generally a compression pump, the discharged air has a pulsating flow and is supplied to the heater as a discontinuous air flow. As a result, the air that has passed through the heater also has a pulsating flow, intermittently hits the measurement sample to be heated, and not only prevents a smooth rise in temperature of the measurement sample, but also induces vibration of the measurement sample. Was.

When a compressor is used, there is no method for suppressing the noise associated with the operation of the built-in compression pump.

Also, due to the difference in frequency of the commercial power supply,
Since the flow rate of the air discharged from the compressor is different between the 50 Hz area and the 60 Hz area, the temperature rise efficiency cannot be made the same without adjusting the flow rate of the air hitting the measurement sample. The flow rate could not be adjusted in the flow path.

SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to provide a sample temperature control device capable of suppressing the pulsating flow and noise of a compressor and controlling the flow rate of air discharged to a measurement sample side. Is to do.

[0009]

In order to achieve this object, a sample temperature control apparatus according to the present invention controls a sample temperature by supplying an air flow from a compressor to a periphery of a measurement sample through a heater. In the sample temperature control device, the air flow from the compressor is divided into a plurality, and a part of the air flow is circulated around the measurement sample via the heater,
The remainder is exhausted to the outside through a tube of soft material.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 shows an air flow path system of the sample temperature control device according to the present invention. The compressed air sent from the compressor 1 is branched by a variable valve 6 into two flow paths. Compressed air flowing through the gas flow path branched to the filter 2 side is discharged into the heater 4 through the first soft vinyl long tube 3 after removing floating dust and the like by the filter 2 and is discharged by the heater. After the temperature is controlled,
It is sprayed on the measurement sample 5. On the other hand, the compressed air flowing from the variable valve 6 in the gas passage branched in another direction is exhausted to the outside through the second soft vinyl long pipe 7.

In the present invention, since a part of the compressed air can be exhausted to the outside through the variable valve 6 as described above, the flow rate of the air blown to the measurement sample 5 via the heater 4 can be arbitrarily adjusted. It is possible. As a result, it is possible to appropriately adjust the difference in the discharge amount of the compressed air due to the difference in the frequency of the commercial power supply, which was conventionally impossible.

Further, by providing the second soft vinyl long pipe 7 at the exhaust port of the variable valve 6, the second soft vinyl long pipe 7 functions as an air reservoir and absorbs vibration of compressed air. As a result, the noise of the compressor 1 accompanying the exhaust of the compressed air can be reduced, and the pulsating flow of the compressed air blown to the sample 5 via the heater 4 can be suppressed.

In this embodiment, the air flow is divided into two, but it is needless to say that the same effect can be obtained by dividing the air flow into three or more.

[0014]

As described above, by using the sample temperature control device of the present invention, the flow rate of the compressed air can be adjusted, and the noise of the compressor and the pulsating flow of the discharged compressed air can be suppressed. ESR and NMR
Temperature variable measurement can be suitably performed.

[Brief description of the drawings]

FIG. 1 is a diagram showing a flow path of an air flow of a conventional sample temperature control device.

FIG. 2 is a diagram showing a flow path of an air flow of the sample temperature control device of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Compressor, 2 ... Filter, 3 ... First soft vinyl long tube, 4 ... Heater, 5 ... Sample, 6 ... Variable valve, 7 ... Second Soft vinyl long tube.

Claims (1)

[Claims] In a sample temperature control device for controlling a sample temperature by supplying an air flow from a compressor to a periphery of a measurement sample through a heater, the air flow from the compressor is divided into a plurality of air flows and a part thereof is heated. A sample temperature control device characterized in that the temperature is circulated around a measurement sample via a vessel and the remainder is exhausted to the outside through a tube of soft material.