JPH0422276Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a radiation temperature measuring device equipped with a temperature standard body.

Some radiation temperature measuring devices include, for example, a rotating sector whose temperature is kept constant, a temperature sensor, a signal processing circuit, and an indicator.

In the above configuration, the device uses a temperature sensor to alternately detect radiation from the object to be measured and radiation from the rotating sector, and uses the signal from the radiation from the rotating sector as a reference signal to instruct a signal corresponding to the temperature of the object to be measured. and indicate its temperature.

Therefore, the above device can obtain a temperature signal with small zero drift by stabilizing the temperature of the rotating sector.

By the way, span calibration is performed in the radiation temperature measuring device. Span calibration is an operation performed to set the scale of the indicator of a measuring device. Specifically,
Based on radiation from an object with a constant radiation coefficient, correction is performed so that the relationship between this detection signal and the detection signal of the constant-temperature rotation sector is always constant. Such span calibration is usually performed using a blackbody standard, but because blackbody standards are expensive, the equipment user does not have a blackbody standard installed, and takes the equipment to the manufacturer as necessary for span calibration. (The manufacturer is equipped with a blackbody standard to check the characteristics of the equipment.)

However, with conventional radiation temperature measuring devices,
Due to the hassle of moving the equipment for span calibration, span calibration is rarely performed during use (the equipment is only checked upon completion), which may lead to a decrease in measurement accuracy. There is.

The present invention has been made in view of these points, and its purpose is to provide a radiation temperature measuring device that facilitates span calibration and improves measurement accuracy.

The configuration of the present invention is such that two measurement casings are installed on a frame with a sheet-like object to be measured in between, and these casings face each other in a direction perpendicular to the flow of the object to be measured. A device that travels back and forth to measure changes in physical quantities about the object to be measured, comprising: a measurement window provided in one of the casings that guides radiation from the object into the casing; and the measurement window. a constant temperature chamber provided within a region within the one housing; a rotating sector provided within the constant temperature chamber for intermittent radiation from the object to be measured introduced through the measurement window; an infrared sensor that is provided and alternately detects radiation from the object to be measured and radiation from the rotation sector according to rotation of the rotation sector; and a measurement window of the one housing of the other housing; and an object with a constant radiation coefficient installed in opposing parts, and during measurement, the two measurement casings are placed within the width of the object to be measured in a direction perpendicular to the flow of the object to be measured. is made to travel back and forth, and while radiation from an object with a constant radiation coefficient provided in the other measurement casing is blocked by the measured object, radiation from the measured object and the constant temperature chamber are The infrared sensor alternately detects radiation from the rotating sector maintained at a constant temperature within the rotating sector, and measures the temperature of the object by using a signal based on the radiation from the rotating sector as a reference signal. The two measurement casings are moved outside the width of the object to be measured, and the radiation from the object with a constant radiation coefficient provided in the other measurement casing and the radiation from the rotating sector are combined into the infrared rays. The sensor detects alternately, detects the span error from these two detection signals, and performs span calibration.

The present invention will be explained below with reference to the drawings.

FIG. 1 shows a radiation temperature measuring device in a device for measuring the basis weight, moisture content, etc. of sheet-like paper of a paper machine according to an embodiment of the present invention. The radiation temperature measuring device maintains the indoor temperature at, for example, 50°C by a control system consisting of a temperature sensor 1, a control circuit 2, a heater 3, etc. a constant temperature chamber 6 which introduces radiation from a motor (running in the direction of arrow X) through a window 5; a rotating sector 8 shown in FIG. 2 installed in the constant temperature chamber 6 and rotated at a constant speed by a motor 7; An infrared sensor 9 is located on the opposite side of the window 5 to the rotating sector 8 and detects radiation introduced from the window 5 or radiation from the rotating sector 8, and a signal processing/control unit converts the temperature signal into an electric signal. A temperature detection system 12 consisting of a conversion circuit 11 that outputs an output to A control system consisting of a predetermined temperature of the object 13,
For example, it has a temperature control system 17 that maintains the temperature at 70°C. The constant temperature bath 6 and the like are installed in the housing 18 along with other devices such as a basis weight meter detection section, a moisture meter light source section, etc. (none of which are shown). On the other hand, the object 13 and the like are also installed in the housing 19 together with a basis weight meter radiation source section, a moisture meter detection section, etc. (none of which are shown). Each of these casings 18 and 19 is installed facing each other on the frame,
By the control signal from the signal processing/control unit 10,
Its running is controlled. That is,
During measurement, the casings 18 and 19 synchronize and travel back and forth in a predetermined range in a direction substantially perpendicular to the flow of the object to be measured 4 (width direction of the sheet), and perform calibration and
During maintenance, the system is designed to stop outside the above range.

In the above configuration, each control system maintains the constant temperature bath 6 at 50° C. (the rotating sector 8 also has the same temperature) and the object 13 at 70° C. When measuring, the housing 18
and 19 transmits radiation from the sheet-like paper 4 flowing in the X direction while reciprocating in a predetermined range to the window 5.
Introduced from. At this time, the radiation from the object 13 is blocked by the paper 4 and does not reach the window 5. Therefore, the infrared sensor 9 alternately detects the radiation from the paper 4 and the radiation from the rotating sector 8, and based on this, the temperature detection system 12 corresponds to the temperature of the paper 4 using the signal from the rotating sector 8 as a reference signal. Find the signal to
The signal is output to the signal processing/control section 10.

On the other hand, calibration is performed at regular intervals or as needed, and the casings 18 and 19 are moved out of the above-mentioned reciprocating range and are in a stopped state. At this time, since there is nothing blocking the window 5 and the object 13, the infrared sensor 9 detects the radiation from the object 13 and the radiation from the rotating sector 8 alternately. Based on this, the temperature detection system 12 uses the signal from the rotating sector 8 as a reference signal to generate a signal corresponding to the temperature of the object 13, that is,
A calibration signal is obtained and output to the signal processing/control section 10.

As mentioned above, calibration can be easily performed by moving the housings 18 and 19 out of the measurement area.

As explained above, the radiation temperature measurement device of the present invention includes an object with a constant radiation coefficient maintained at a predetermined temperature, that is, a temperature standard body.
It can facilitate span calibration and improve measurement accuracy.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention, and FIG. 2 is a diagram showing a rotating sector. 1, 4... Temperature sensor, 2, 15... Control circuit, 3, 16... Heater, 8... Rotating sector, 9
...Infrared sensor, 13...Object with constant radiation coefficient.

Claims (1)

[Claim for Utility Model Registration] Two measurement casings are installed on a frame with a sheet-like object to be measured sandwiched between them, and these casings face each other in a direction perpendicular to the flow of the object to be measured. A device for measuring changes in physical quantities of the object to be measured by reciprocating the object under test, comprising: a measurement window provided in one of the casings that guides radiation from the object to be measured into the casing; a constant temperature chamber provided in a region within the one housing, a rotating sector provided in the constant temperature chamber and for intermittent radiation from the object to be measured introduced through the measurement window; and the constant temperature chamber. an infrared sensor that is provided within the housing and alternately detects radiation from the object to be measured and radiation from the rotating sector according to the rotation of the rotating sector; and measuring the one housing of the other housing. and an object with a constant radiation coefficient installed in a part facing the window, and during measurement, the two measuring casings are placed within the width of the object to be measured and are placed perpendicular to the flow of the object to be measured. The object to be measured is made to travel back and forth in the direction of The infrared sensor alternately detects radiation from the rotating sector, which is maintained at a constant temperature in a thermostatic chamber, and measures the temperature of the object to be measured using a signal based on the radiation from the rotating sector as a reference signal, and calibrates. When the two measurement casings are moved outside the width of the object to be measured, radiation from an object with a constant radiation coefficient provided in the other measurement casing and radiation from the rotating sector are A radiation temperature measuring device characterized in that the infrared sensor detects alternately, detects a span error from these two detection signals, and performs span calibration.