JP3012786U - Liquid density meter - Google Patents

Abstract

(57) [Summary] [Purpose] A liquid density meter that can measure the density of liquid in a container with high accuracy by constraining the positions of the gamma ray source, gamma ray detector, and container relative to each other. [Composition] In the present densitometer O, the gamma ray emitted from the gamma ray source 1 is used to measure the liquid density based on the intensity change of the gamma ray when the gamma ray detector 4 detects the gamma ray transmitted through the liquid 3 in the container 2. At this time, the gamma ray source 1 and the gamma ray detector 4 are connected in a substantially U-shape by a mounting bracket 5 which can be used by being hung on the edge of the container 2. With the above configuration, highly accurate measurement is possible.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a liquid densitometer, and more particularly to a liquid densitometer that can easily measure the densities of all kinds of liquids contained in a container using gamma rays.

[0002]

[Prior art]

The density is measured by the fact that the gamma rays emitted from radioisotopes such as Cs137 and Co60, which are gamma-ray sources, are absorbed and scattered according to their density when passing through a substance with a certain thickness. can do. That is, when the thickness of the object to be measured is d, the density to be obtained is ρ, and the mass absorption coefficient for the gamma ray used is μ _m , the output I of the gamma ray detector can be expressed by the following equation with A as a constant. _{I = A · exp (-μ m} · d · ρ) ... (1) but Ru can be applied to this measurement principle to the density measurement of any kind of liquid in the container, in which case, conventionally, put the liquid The gamma ray source and the gamma ray detector were placed opposite to each other with the container sandwiched therebetween. The density calculation is performed by a calculation means (not shown) based on the output I of the gamma ray detector.

[0003]

[Problems to be solved by the device]

 As described above, in the conventional liquid densitometer, if the relative position between the gamma-ray source, the container, and the gamma-ray detector changes for some reason during measurement, the thickness of the object to be measured changes and the source intensity of the gamma-ray source changes. The output I of the gamma-ray detector with respect to fluctuates, and the measurement accuracy may decrease. Therefore, it is necessary to restrain the relative positions of the three parties by some method. In order to solve the problems in the prior art, the present invention improves the liquid density meter and restricts the relative position between the gamma ray source, the container and the gamma ray detector, so that the liquid inside the container is restrained. The purpose of the present invention is to provide a liquid densitometer capable of measuring the density of liquid with high accuracy.

[0004]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention measures the liquid density based on the intensity change of the gamma rays emitted from the gamma ray source when the fluid in the container is transmitted and detected by the gamma ray detector. In the liquid densitometer, the gamma-ray source and the gamma-ray detector are connected in a substantially U-shape by a mounting bracket that can be used by being hung on the edge of the container. Further, it is a liquid density meter in which the gamma ray source and the gamma ray detector are connected to the mounting metal fitting so that the distance between them can be adjusted. Further, it is a liquid density meter in which only the gamma ray source is immersed in the liquid in the container.

[0005]

[Action]

 According to the present invention, the gamma-ray source and the gamma-ray detector are substantially U-shaped and are connected by a mounting bracket that can be used by hanging on the edge of the container. By constraining the relative positions of the gamma-ray source, the container, and the gamma-ray detector, it is possible to prevent fluctuations in the output of the gamma-ray detector, so that the density of the liquid contained in the container can be adjusted with high accuracy. And stable measurement is possible. Furthermore, if the gamma-ray source and the gamma-ray detector are connected to the mounting metal fitting so that the distance between them can be adjusted, the relative position can be set accurately, so that more accurate liquids can be obtained. Various measurements are possible. Furthermore, by immersing only the gamma-ray source in the liquid in the container, it is possible to perform highly accurate measurement using a radiation source having a relatively low intensity even when the container is large.

[0006]

【Example】

 Embodiments embodying the present invention will be described below with reference to the accompanying drawings to provide an understanding of the present invention. It should be noted that the following embodiment is an example in which the present invention is embodied and does not limit the technical scope of the present invention. FIG. 1 is a front view, a plan view and a right side view showing a schematic configuration of a liquid densitometer O according to an embodiment of the present invention. As shown in FIG. 1, in the liquid densitometer O according to one embodiment of the present invention, when the gamma ray emitted from the gamma ray source 1 is transmitted through the liquid 3 in the container 2 and detected by the gamma ray detector 4, The point of measuring the liquid density based on the intensity change of gamma rays and the measuring principle itself are the same as the conventional example. However, this embodiment is different from the conventional example in that the gamma ray source 1 and the gamma ray detector 4 are connected in a substantially U-shape by a mounting bracket 5 that can be used by being hung on the edge of the container 2. The densitometer O will be described in more detail below.

A liquid 3, which is an object to be measured, is filled up to a predetermined liquid level in a container 2 such as a commercially available open tank. Further, here, it is assumed that only the gamma ray source 1 is immersed in the liquid 3 in the container 2. A substantially U-shaped mounting bracket 5 is detachably attached to the edge 2a of the container 2 by, for example, a clamp mechanism 5a, and a gun wire is attached to the substantially U-shaped one end side 5b of the mounting bracket 5. The source 1 is attached to the other end side 5c of the gamma ray detector 4 so as to face each other with the wall of the container 2 interposed therebetween. Since the one end 5b of the mounting bracket 5 is immersed in the liquid 3 together with the gamma ray source 1 here, a hole 5d is appropriately formed so as not to obstruct the flow of the liquid 3 in the container 2 as much as possible. There is. The measurement gap b, which is the thickness of the object to be measured, is about 50 mm to 100 mm, for example. This is to suppress the radiation source intensity to 3.7 MBq or less, which is usually used in terms of radiation protection. In order to adjust the gap b, for example, by combining a bolt and an elongated hole or adjusting the shim, it is possible to adjust the distance between the gamma ray source 1 and the gamma ray detector 4 in the mounting bracket 5. It is connected. In this state, perform the following measurements.

A shutter (not shown) in the gamma ray source 1 is opened to emit gamma rays into the liquid 3, and the transmitted rays are detected by the gamma ray detector 4. Then, the output I of the gamma ray detector 4 is guided to a calculation means (not shown) through the wiring 4a, and the density calculation is performed there. By thus constraining the relative positions among the gamma ray source 1, the container 2 and the gamma ray detector 4, it is possible to prevent fluctuations in the output I of the gamma ray detector 4, so that the liquid 3 can be accurately measured. Stable measurement is possible. Further, since the mounting bracket 5 connects the gamma ray source 1 and the gamma ray detector 4 so that the distance between them can be adjusted for adjusting the measurement gap b, the relative position can be accurately set. This makes it possible to measure liquids with higher accuracy. The measurement gap b between the gamma ray source 1 and the gamma ray detector 4 may be manually adjusted, but in actual use, it may be automatically adjusted by using a driving source. Further, if only the gamma ray source 1 is immersed in the liquid 3 in the container 2 as in the above embodiment, even if the container 2 is large, it is possible to perform highly accurate measurement using a radiation source having a relatively low intensity. However, when the container 2 is small, the gamma ray source 1 and the gamma ray detector 4 may be opposed to each other by sandwiching the container 2 as in the conventional example.

[0009]

[Effect of device]

 Since the liquid densitometer according to the present invention is configured as described above, it is possible to prevent fluctuations in the output of the gamma ray detector by constraining the relative position between the gamma ray source, the container and the gamma ray detector. As a result, the density of the liquid contained in the container can be measured with high accuracy and stability. Furthermore, if the gamma-ray source and the gamma-ray detector are connected to the mounting metal fitting so that the distance between them can be adjusted, the relative position can be set accurately, so that more accurate liquids can be obtained. Various measurements are possible. Furthermore, by immersing only the gamma-ray source in the liquid in the container, it is possible to perform highly accurate measurement using a radiation source having a relatively low intensity even when the container is large.

[Brief description of drawings]

FIG. 1 is a front view, a plan view and a right side view showing a schematic configuration of a liquid density meter O according to an embodiment of the present invention.

[Explanation of symbols]

 O ... Liquid density meter 1 ... Gamma ray source 2 ... Container 3 ... Liquid 4 ... Gamma ray detector 5 ... Mounting bracket

Claims (3)

[Scope of utility model registration request] 1. A gamma ray emitted from a gamma ray source,
In a liquid densitometer for measuring a liquid density based on a change in the intensity of gamma rays when the fluid in a container is transmitted and detected by a gamma ray detector, the gamma ray source and the gamma ray detector are substantially U-shaped. A liquid densitometer characterized by being connected with a mounting metal fitting that can be hung on the edge of a container. 2. The liquid density meter according to claim 1, wherein the mounting bracket is connected to the gamma ray source and the gamma ray detector so that the distance between them can be adjusted. 3. The liquid density meter according to claim 1, wherein only the gamma ray source is immersed in the liquid in the container.