What is infrared radiation-based measurement of constituent and content? An explanation of the measurement principle and calibration curve concept.

Utilizing the infrared absorption characteristic of each material

Not all materials absorption all wavelengths of infrared radiation equally. The wavelengths that are easily absorption and the degree of absorption vary depending on the type and structure of the material.

Capture information related to specific constituent.

From constituent contained in the sample being measured, we select those that exhibit characteristic behaviors in their interaction with infrared light, and measure the optical changes they undergo.

Determining the amount of constituent requires a relationship with a standard.

The optical information detected by the sensor is not the same as the actual amount of constituent. By checking the relationship with the reference analytical value, the amount constituent can be determined from the optical measurement.

Different substances absorption different wavelengths.

Infrared radiation has a variety of wavelengths. Because different materials absorption differently, we can use wavelengths that produce characteristic changes in radiation for measurement.

Use the wavelength corresponding to constituent you want to measure.

If the target constituent changes, the wavelength used and the measurement method will also change. Therefore, even when using infrared light, it is necessary to first clarify "which constituent to measure."

We should also consider the influence of other constituent.

Actual materials may contain multiple constituent. Since constituent other than the one you want to measure may also absorption infrared light, you need to consider the optical characteristics of the entire object being measured.

constituent indicate "what is included."

For example, if a material contains a specific substance, that substance will be constituent in question.

Concentration and content indicate "how much is present."

The amount of the target constituent present is expressed in terms of concentration, content, or amount, depending on the target and evaluation method.

Infrared measurement utilizes the relationship with the amount of constituent.

In infrared measurement, the measurement value is determined by confirming the relationship between the optical changes caused by the presence of constituent and the actual amount of constituent.

The optical signal itself is not constituent concentration.

The sensor detects optical information such as the intensity and absorption of light at each wavelength. These values do not directly represent the concentration or content of constituent.

Prepare a baseline analytical value.

The actual amount constituent in the target substance is confirmed using standard analytical methods.

Correspond optical signals to analytical values.

For samples with different constituent concentrations, we correlate the optical measurements using infrared light with the reference analytical values.

Determine the amount constituent from calibration curve

calibration curve is used to represent the relationship between optically measured values and the amount of a reference constituent, using mathematical formulas or graphs. In actual measurements, the amount constituent is determined from this relationship.

Water is also one of constituent that can be detected by infrared light.

Water has the property of absorption infrared light of specific wavelengths, and this characteristic can be used to measure moisture.

The wavelength used varies depending on the target.

absorption characteristic of different substances differ depending on whether you are measuring moisture or another constituent. Therefore, the wavelength and measurement conditions should be considered according to the substance being measured.

There are commonalities in the basic concepts.

Both methods utilize the relationship between optical information obtained by infrared light and the quantity we actually want to know to determine the measurement value.

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Especially with materials containing multiple constituent, it's not always necessary to isolate and measure only one constituent. It's important to consider the optical characteristic of the entire sample and confirm the relationship with the actual analytical values.

Sampling analysis alone may not adequately capture changes.

The method of collecting and analyzing samples allows us to confirm the state of constituent at the time of collection. However, it can be difficult to understand the changes that have occurred between samples.

Continuous measurement allows us to understand changes during process.

If measurements can be taken continuously during process, it is possible to understand the temporal changes and variations in the amount of constituent.

Used for quality and process control.

Recording and monitoring measurement results can be used to check process conditions and for quality control.

When implementing online, continuous measurement, it is necessary to consider factors such as measurement location, reference values, and the uniformity of the object being measured.

What constituent do you want to measure?

We will clarify constituent to be measured and confirm what unit and indicators will be used to manage those constituent.

What concentration or content should be measured?

It is necessary to determine the expected range of concentration or content and establish a relationship that allows for measurement within that range.

What is the standard analytical method?

To confirm the relationship between optical measurements and constituent amounts, we will determine the method used to obtain the reference analytical values.

What are the coexisting constituent?

Since infrared absorption by other constituent may affect the measurement, we will check the overall composition of the material being measured.

Will the materials, product, and proportions change?

Changes in materials or formulations may alter the optical characteristic and their relationship to constituent amounts. Please check whether a product change is necessary.

Are the measurement location and the condition of the object appropriate?

When measuring only a portion of an object, ensure that the measurement is representative of the entire product. Consider factors such as movement, variation, and surface condition.

What will the measurements be used for?

The purpose of using the measurement results will be clearly defined, such as quality control, recording, monitoring, and verification of process conditions.