ISO 13322-2:2021 粒子サイズ分析—画像分析方法—パート2：動的画像分析方法 | ページ 6

3.1.1

acceptable depth of field

<dynamic image analysis> depth with respect to the focal depth where the sharpness of the edges of the particle images is accepted for segmentation

Note 1 to entry: The acceptable depth of field is decided by the software based on the sharpness of the images and is also dependent on the particle size.

3.1.2

accuracy

closeness of agreement between a test result or measurement result and the true value (3.1.20)

Note 1 to entry: In practice, the accepted reference value is substituted for the true value.

Note 2 to entry: The term “accuracy”, when applied to a set of test or measurement results, involves a combination of random components and a common systematic error or bias component.

Note 3 to entry: Accuracy refers to a combination of trueness (3.1.19) and precision (3.1.12) .

[SOURCE:ISO 3534‐2:2006, 3.3.1]

3.1.3

certified reference material

CRM

reference material (3.1.13) characterised by a metrologically valid procedure for one or more specified properties, accompanied by an RM certificate that provides the value of the specified property, its associated uncertainty, and a statement of metrological traceability

Note 1 to entry: The concept of value includes a nominal property or a qualitative attribute such as identity or sequence. Uncertainties for such attributes may be expressed as probabilities or levels of confidence.

Note 2 to entry: Metrologically valid procedures for the production and certification of RMs are given in, among others, ISO 17034 and ISO Guide 35.

Note 3 to entry: ISO Guide 31 gives guidance on the contents of RM certificates.

Note 4 to entry: ISO/IEC Guide 99:2007 has an analogous definition.

[SOURCE:ISO Guide 35:2017, 3.2]

3.1.4

flow cell

measurement cell inside which the gas- or liquid-particle mixture flows

3.1.5

frame coverage

<dynamic image analysis> fraction of the image area that is obscured by the projection area of all segmented particles counted in the image

Note 1 to entry: Frame coverage can be expressed as a part or percentage of the image area.

3.1.6

intermediate precision

<dynamic image analysis> accuracy (3.1.2) and precision under intermediate precision conditions (3.1.7)

[SOURCE:ISO 3534-2:2006, 3.3.15, modified —"and precision" and the field of application"dynamic image analysis" have been added.]

3.1.7

intermediate precision conditions

<dynamic image analysis> conditions where test results or measurement results are obtained on different dynamic image analysis instruments and with different operators using the same prescribed method

Note 1 to entry: There are four elements to the operating condition: time, calibration, operator and equipment.

3.1.8

image capture device

matrix camera or line scan camera for converting an optical image to digital image data

3.1.9

measurement zone

volume in which particles are measured by an image analyser, formed by the measurement frame including a third dimension from the acceptable depth of field (3.1.1)

Note 1 to entry: The measurement zone is defined by the software (see 3.1.1).

3.1.10

orifice tube

tube with an aperture through which a stream of fluid with dispersed particles flows

3.1.11

illumination

continuous illumination for an image capture device (3.1.8) with an electronic exposure time controller, or illumination of short duration for a synchronized image capture device

3.1.12

precision

closeness of agreement between independent test/measurement results obtained under stipulated conditions

Note 1 to entry: Precision depends only on the distribution of random errors and does not relate to the true value (3.1.20) or the specified value.

Note 2 to entry: The measure of precision is usually expressed in terms of imprecision and computed as a standard deviation of the test results or measurement results. Less precision is reflected by a larger standard deviation.

Note 3 to entry: Quantitative measures of precision depend critically on the stipulated conditions. Repeatability conditions (3.1.15) and reproducibility conditions are particular sets of extreme stipulated conditions.

[SOURCE:ISO 3534‐2:2006, 3.3.4]

3.1.13

reference material

rm

material, sufficiently homogeneous and stable with respect to one or more specified properties, which has been established to be fit for its intended use in a measurement process

Note 1 to entry: RM is a generic term.

Note 2 to entry: Properties can be quantitative or qualitative, e.g. identity of substances or species.

Note 3 to entry: Uses may include the calibration of a measurement system, assessment of a measurement procedure, assigning values to other materials, and quality control.

Note 4 to entry: ISO/IEC Guide 99:2007 has an analogous definition, but restricts the term “measurement” to apply to quantitative values. However, ISO/IEC Guide 99:2007, 5.13, Note 3 (VIM), specifically includes qualitative properties, called “nominal properties”.

[SOURCE:ISO Guide 35:2017, 3.1]

3.1.14

repeatability

precision (3.1.12) under repeatability conditions (3.1.15)

Note 1 to entry: Repeatability can be expressed quantitatively in terms of the dispersion characteristics of the results.

[SOURCE:ISO 3534‐2:2006, 3.3.5]

3.1.15

repeatability conditions

observation conditions where independent test/measurement results are obtained with the same method on identical test/measurement items in the same test or measuring facility by the same operator using the same equipment within short intervals of time

[SOURCE:ISO 3534‐2:2006, 3.3.6]

3.1.16

sampling volume

volume in which the particles are within the field of view of the image analyser including a third dimension from the sampling volume depth (3.1.17)

3.1.17

sampling volume depth

length which describes the extent of the particle field in front of the camera

3.1.18

sheath flow

particle-free fluid flow surrounding particle-laden fluid for directing particles into a specific measurement zone (3.1.9)

3.1.19

trueness

closeness of agreement between the expectation of a test result or a measurement result and a true value (3.1.20)

Note 1 to entry: The measure of trueness is usually expressed in terms of bias.

Note 2 to entry: Trueness is sometimes referred to as “accuracy of the mean”. This usage is not recommended.

Note 3 to entry: In practice, the accepted reference value is substituted for the true value.

[SOURCE:ISO 3534‐2:2006, 3.3.3]

3.1.20

true value

value which characterizes a quantity or quantitative characteristic perfectly defined in the conditions which exist when that quantity or quantitative characteristic is considered

Note 1 to entry: The true value of a quantity or quantitative characteristic is a theoretical concept and, in general, cannot be known exactly.

Note 2 to entry: For an explanation of the term “quantity”, refer to ISO 3534‐2:2006, Note 1 of 3.2.1.

[SOURCE:ISO 3534‐2:2006, 3.2.5]