JP2591911Y2 - Coating meter - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating meter using fluorescent X-rays.

[0002]

2. Description of the Related Art As a measuring apparatus using fluorescent X-rays, for example, Japanese Utility Model Laid-Open No. 1-81559 and Japanese Utility Model Laid-Open No. 1-935 are known.
No. 55, etc., there is a coating meter which is a premise of the present invention, paying attention to a coating agent containing calcium, and coating the coated paper coated with the coating agent containing calcium with the conventional paper. The technique using fluorescent X-rays of the technique, that is, the amount of the coating agent can be determined by irradiating primary X-rays from a ring-shaped source and selectively measuring the fluorescent X-rays generated from the calcium. It is a measuring device configured to be able to.

Hereinafter, a conventional coating amount meter will be described with reference to the drawings.

FIG. 3 is a view for explaining the outline of a coating amount meter. FIG. 4 is a diagram provided for explanation of a conventional technique.

In FIGS. 3 and 4, reference numeral 1 denotes a coated paper (hereinafter simply referred to as "paper") coated with a coating agent containing calcium as an object to be measured, and 2 irradiates the paper 1 with primary X-rays. This is a ring-shaped source. Reference numeral 3 denotes a shutter driven by a shutter drive signal disposed between the paper 1 and the ring-shaped radiation source 2. Reference numeral 4 denotes a sensor (proportional counter) for selectively detecting, via a shutter, fluorescent X-rays generated from calcium from the paper 1 after primary X-ray irradiation on the paper.

Reference numeral 5 denotes a reference sample driven by a reference sample set signal. The reference sample 5 is arranged so as to be located at the top of the paper in the drawing, and the coating amount meter is calibrated as necessary. It has become.

Reference numeral 6 denotes an amplifier circuit for amplifying a signal selectively detected by the sensor 4 and outputting the amplified signal to a wave height discrimination circuit 7.
Is a counter for counting data from the wave height discrimination circuit 7. The output of this counter is measured by circuit means (not shown). Thereby, the amount of the coating agent can be determined. FIG. 4 shows the relationship between the output of the meter and the coating amount (M; actual measurement range).

In such a configuration, when calibration is performed using the reference sample 5, zero and span are confirmed at two points, that is, when the air layer is formed and when the reference sample contains a large amount of calcium.

[0009]

However, such a conventional technique has the following problems.

Although a reference sheet for span calibration uses a stable sheet containing a large amount of calcium, the sensor has a practically usable measurement range which is practically limited, so that a stable output can be obtained. There is currently no suitable sample available.

Although the amount of calcium contained in the reference sample may be adjusted so that an arbitrary amount of fluorescent X-rays can be obtained, it is not practical because materials having different calcium contents must be prepared as needed. Absent.

The present invention has been made in view of such a conventional problem, and has as its object to provide a calibration sample that can obtain an output in a measurement range actually used. By providing the coating amount meter, it is possible to provide a coating amount meter capable of checking the stability of the sensor itself and detecting a failure on the hardware of the device.

[0013]

In order to achieve the above-mentioned object, the present invention irradiates a coated paper 1 containing calcium with primary X-rays from a ring-shaped source 2 and after the primary X-ray irradiation. In a working meter that detects the fluorescent X-rays generated from calcium from the coated paper with the sensor 4 and measures the working amount of the coated paper, the extent to which the output of the working meter is saturated on the surface. Mosquito
A first member containing calcium and a small amount of
At least one second member, wherein the first member and the second member
One of the two members is detachably superimposed, and the fluorescent X-ray is
The output when irradiating is about the same as the measurement range of the coated paper.
It is characterized in that it has been calibrated using a standard sample as an output .

[0014]

A calibration standard sample is prepared by laminating a thin plastic sheet containing no calcium on a sheet containing a large amount of calcium. According to this, it is possible to attenuate the amount of primary X-rays reaching calcium and at the same time attenuate the amount of fluorescent X-rays generated from calcium. Therefore, a required amount of fluorescent X-ray is obtained as a result. By using such a calibration sample, the sensor itself can be calibrated with the same output as the actually used measurement range.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to the drawings showing specific embodiments. In the following drawings, the same parts as those in FIGS. 3 and 4 are denoted by the same reference numerals, and description thereof will be omitted.

FIG. 1 is a diagram for explaining a specific embodiment of the present invention. FIG. 2 is a diagram for explaining the present invention.

In FIGS. 1 and 2, reference numeral 9 denotes a sheet containing a large amount of calcium (hereinafter referred to as "calcium plate").
9a and thin plastic sheet 9 without calcium
b is a calibration standard sample constructed by superimposing b. 1
Reference numeral 0 denotes a detection head that houses the ring-shaped source 2 and the sensor 4.

In the output axis on the vertical axis of FIG. 2, A indicates the output value at the time of the calibration sample, and B indicates the output when only the calcium plate is used.

By the way, the "large amount" of the calcium plate 9a means that the calcium plate 9a contains calcium to such an extent that a fluorescent X-ray output that saturates the sensor output is obtained. Further, the plastic sheet 9b may be constituted by a thin sheet of, for example, polyester or the like which does not contain calcium.

The calibration standard sample 9 is set with good reproducibility at a pass line position in the sensor gap by a suitable holder or the like (not shown). In this way, the amount of primary X-rays reaching calcium is attenuated, and at the same time the amount of fluorescent X-rays generated from calcium is attenuated. As a result, a necessary amount of fluorescent X-ray is obtained as a result.

In a state where such a calibration standard sample 9 is set at a position where the primary X-rays from the ring-shaped source 2 are irradiated, the sensor itself is calibrated with the same output as the measurement range actually used. I do.

In the calibration operation, an indicated value on a display (not shown) is checked, and the indicated value is recorded as an indicated value in a combination of the calibration standard sample 9 and the sensor.
Perform by holding.

After performing such a calibration operation, for example, the calibration standard sample is set again at an appropriate interval, and the indicated value is checked each time. If there is any deviation, it can be checked that a failure has occurred on the hardware of the apparatus.

The above explanation is based on the fluorescence X from calcium.
Although the description has been made in connection with the detection of the line, the present invention can be applied without changing the essence of the present invention even in a configuration in which another metal material such as titanium is detected.

In the above description, the calibration standard sample 9 is set separately from the detection head 10. However, the calibration standard sample itself is built in the detection head.
Adding a function to set the calibration standard sample at the pass line position where the paper travels as needed does not depart from the spirit of the present invention.

In addition, plastic sheets having a different thickness can be obtained relatively easily as compared with calcium plates.
Arbitrary output can be obtained by making a plurality of combinations with different thicknesses. In this way, it is possible to check not only one point in the measurement range but also a plurality of points.

[0027]

The present invention is configured as described above, and has the following effects.

(A) As the calibration standard sample, at least one kind of material containing a sufficient amount of calcium may be prepared, and by directly using this, the span calibration of the coating amount meter can be easily performed. it can.

(B) In the calibration standard sample, an arbitrary output can be obtained as a coating weight meter by inserting a plastic sheet of an appropriate thickness between the calcium plate and the sensor. It is also possible to easily check or calibrate the hardware failure or the like.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining a specific embodiment of the present invention.

FIG. 2 is a diagram provided for explanation of the present invention.

FIG. 3 is a diagram provided for an overview of a coating amount meter.

FIG. 4 is a diagram provided for explanation of a conventional technique.

[Explanation of symbols]

 2 Ring source 4 Sensor 9a Sheet (calcium plate) 9b Plastic sheet 9 Standard sample for calibration 10 Detection head

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Toshiyuki Suzuki 2-9-132 Nakamachi, Musashino-shi, Tokyo Yokogawa Electric Corporation (56) References JP-A-61-207911 (JP, A) 3-52609 (JP, U) Japanese Utility Model 1-81559 (JP, U) Japanese Utility Model 1-93555 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) G01B 15/00 -15/08 G01N 23/00-23/227

Claims (1)

(57) [Scope of request for utility model registration] 1. A coating paper 1 containing calcium is irradiated with primary X-rays from a ring-shaped source 2 and fluorescent X-rays generated from calcium from the coating paper after the primary X-ray irradiation are detected by a sensor 4. In the measuring device for measuring the amount of processing of the coated paper by detecting the amount of calcium on the surface, the output of the
, And at least one second member not containing calcium , wherein the first member and one of the second members are detachably attached.
The output when irradiating the fluorescent X-rays is
A standard sun that has the same output as the measuring range of coated paper
A work volume meter characterized by being calibrated using a pull .