JPH0531403A - Centrifuge rotor temperature detection method - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] The present invention relates to a temperature detection method for detecting the temperature of a rotating rotor of a centrifuge, and an object thereof is to directly detect the rotor temperature. It is to detect the rotor temperature accurately. [Structure] A large number of pieces to be detected 2 whose reflectance increases when the reaction temperature exceeds a reaction temperature threshold value are arranged on the rotor surface for each temperature to be detected for each resolution temperature.
The counter 13 counts the number of pieces to be detected whose reflectance has increased during rotation, and the CPU 1
4 detects the temperature of the rotor 1 by conversion.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature detecting method for detecting a rotor temperature during high speed rotation of a rotor loaded with a sample to be centrifuged.

[0002]

2. Description of the Related Art There is a temperature detecting method in which a rotor is irradiated with infrared rays and a temperature is detected by utilizing a propagation phenomenon related to emission and absorption, that is, thermal radiation. Since the thermal radiation energy and the temperature are directly related to each other, the temperature can be detected. Also,
There is a temperature detection method in which an ambient temperature in the chamber is detected by a temperature sensor installed in the chamber in which the rotor rotates and the temperature correction data is added to detect the rotor temperature.

[0003]

The detection method of detecting temperature by utilizing heat radiation can be directly measured in a non-contact manner instantly and high accuracy can be expected, but the equipment is expensive and large-scale. It is not common for centrifuges because it tends to occur. In addition, the method of detecting the ambient temperature inside the chamber with a temperature sensor and adding the temperature correction data to detect the rotor temperature is an indirect detection method.Therefore, frictional heat during rotation of the rotor, heat conduction from the drive unit, rotation Even if the correction value data is added due to the vortex created by the above, a large error may occur. An object of the present invention is to directly detect the surface temperature of the rotor and accurately detect the rotor temperature without the temperature correction data.

[0004]

In order to achieve the above-mentioned object, the present invention prepares a large number of pieces to be detected whose reflectance increases at a predetermined temperature or more for each detection temperature for each resolution. The detection piece is mounted on the rotor surface, the number of pieces to be detected whose reflectance has increased in response to temperature is counted, and the rotor temperature is detected from the count value.

[0005]

When the rotor configured as described above is rotated at a high speed, the number of detected pieces having a large reflectance changes according to the temperature of the rotor. Therefore, the detected piece having a large reflectance is changed. By counting the number of, the rotor temperature can be detected.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a bottom view showing an embodiment of a rotor used in the rotor temperature detecting method of the present invention. FIG. 2 is a sectional view showing the chamber portion. FIG. 3 is a block diagram of the temperature detector.

The pieces to be detected 2 are arranged on the surface of the rotor 1 so as to be radial around the rotation axis. The detected pieces 2 are set by shifting different reaction temperature threshold values for each resolution temperature, and the detected piece 2 has a low temperature threshold value, that is, from the lower limit value to the upper limit value of the temperature detection range for each resolution temperature. Arrange. The detection piece 2 is attached to the rotor 1 by adhesion or application using a liquid material.

The light emitting diode 3 is fixed to the bottom of the chamber 5, and the bottom of the rotating rotor 1 is illuminated by the light emitting diode 3. When the irradiation light 7 hits the detected piece 2 having a large reflectance by reacting, the reflected light 8 is reflected and enters the photodiode 4 provided on the bottom surface of the chamber 5.
The reflected light 8 is generated by the photodiode 4 and the temperature signal detection circuit 10.
Is converted into a pulse form and sent to the counter 13. On the other hand, a pulse generated by the rotation detection device 11 and the rotation signal detection circuit 12 each time the rotor 1 makes one rotation is sent to the counter 13. The counter 13 counts the number of the detected pieces 2 whose reflectance has increased during a pulse from the rotation signal detection circuit 12 generated each time the rotor 1 makes one rotation, that is, while the rotor 1 makes one rotation. Then, the count value is sent to the CPU 14 at a predetermined timing. The CPU
Reference numeral 14 refers to a data table stored in, for example, a ROM (not shown) to convert and detect the temperature of the rotor 1 from the count value, that is, the number of the detected pieces 2 whose reflectance has increased.

[0009]

As described above, according to the present invention, a detected piece whose reflectance is increased when the temperature reaches a predetermined temperature or more is mounted on the rotor surface, and the detected piece whose reflectance is increased becomes large. Since the rotor temperature can be directly detected by counting the number, the rotor temperature can be detected reliably and accurately with a simple configuration.

[Brief description of drawings]

FIG. 1 is a bottom view showing a rotor used in a rotor temperature detecting method of the present invention.

FIG. 2 is a sectional view showing a chamber portion of a centrifuge adopting the temperature detecting method of the present invention.

FIG. 3 is a block diagram of a temperature detection unit used in the temperature detection method of the present invention.

[Explanation of symbols]

1 is a rotor, 2 is a detected piece, 3 is a light emitting diode, 4 is a photodiode, 5 is a chamber, 6 is a cooling pipe, 7
Is irradiation light, 8 is reflected light, 10 is a temperature signal circuit, 11 is a rotation detection device, 12 is a rotation signal circuit, 13 is a counter, 1
4 is a CPU.

Claims (1)

Claim: What is claimed is: 1. A centrifuge for centrifuging a sample loaded with a sample to be centrifuged by rotating the rotor at a high speed. The method for detecting the temperature of a rotor of a centrifuge characterized in that the number of the detected pieces whose reflectance is increased is attached to the rotor, and the temperature of the rotor is detected by the counted value. .