Chapter 1
Why is non-contact measurement using radiation thermometer used?
radiation thermometer is a device that measures the surface temperature of an object non-contact by utilizing the infrared energy emitted from the object.
Because it does not require directly attaching a sensor to the object, it is used for high-temperature objects, moving products, objects whose state changes upon contact, and in locations where it is difficult to install sensors.
Measurement of high-temperature objects
It can measure the surface temperature of objects that are difficult to approach with contact sensors, such as inside furnaces or heated products.
Measurement of moving objects
It can measure objects that are difficult to directly attach sensors to, such as products being transported.
Subjects that cannot be contacted
It can be used for objects that you do not want to come into direct contact with due to hygiene reasons or structure constraints.
On the other hand, the fact that it is non-contact does not guarantee high accuracy measurement. Rather, it is important to understand the measurement principle, which differs from that of contact methods, and to adjust the conditions according to the object being measured and the environment.
The principles of radiation thermometer and how to choose the right one are explained in detail in "A Guide to radiation thermometer Without Making Mistakes."
Chapter 2
What kinds of errors can occur in non-contact temperature measurement?
indicated value from radiation thermometer is not determined solely by the temperature of the object being measured. Differences between the actual temperature and indicated value can occur due to factors such as the surface condition of the object and the measurement conditions.
| Factor | Influence on measurement | Confirm |
|---|---|---|
| emissivity | The way infrared radiation emitted from an object appears changes. | Material, surface condition, emissivity setting |
| Measured distance | The relationship between distance and the measurement field of view changes. | D:S ratio, size of the object being measured. |
| Measurement angle | This can lead to changes in the object's reflection and measurement conditions. | Sensor orientation, surface condition of the object |
| Reflection from the surroundings | The surrounding thermal radiation may be mistakenly perceived as radiation from the object itself. | Surrounding high-temperature objects, reflective surfaces, installation location |
| optics /com status | Dirt and age-related changes may affect the measurement results. | Lens/window cleanliness, equipment condition, inspection/calibration |
Instead of assuming that a high-performance radiation thermometer is error-free, it's crucial to examine the equipment, object, and installation conditions as a single measurement system.
Chapter 3
What is emissivity? Why is setting it important?
emissivity is a quantity that represents the degree to which an object's surface emits thermal radiation. Since radiation thermometer calculate temperature based on emissivity of the object being measured, errors may occur in indicated value if emissivity setting does not match that of the actual object.
Even with the same material, emissivity may change depending on the oxidation state, roughness, polishing condition, coating, and dirt on the surface.
Don't decide based solely on the material.
It's important to check the actual surface condition rather than determining a fixed value based solely on the material name, such as "it's iron, so it has this emissivity."
Check the surface condition
emissivity may change due to oxidation, polishing, painting, dirt, etc.
Confirm by actual measurement.
If necessary, compare radiation thermometer settings and measurement conditions with those of a contact thermometer.
For important points to consider when selecting and using radiation thermometer, such as emissivity and D:S ratio, please refer to the radiation thermometer guide.
Chapter 4
Also, check the installation conditions, such as measurement distance, angle, and reflection.
In non-contact temperature measurement, not only emissivity but also the measurement location itself affects the results.
| Check items | Reason for checking | Examples of countermeasures |
|---|---|---|
| Measured distance | If the object being measured is not within the full field of view, the measurement may be affected by the ambient temperature. | D:S比と対象サイズを確認する |
| Measurement angle | The surface reflection conditions change. | Measure from the most appropriate angle possible. |
| surrounding high-temperature objects | thermal radiation from the surroundings may be reflected from the surface of the object, affecting the measurement results. | Consider changing the installation location or implementing shielding measures. |
| Measurement window and optics | Measurement conditions may change depending on dirt and other deposits. | Determine the cleaning and inspection methods. |
Chapter 5
What is the calibration of radiation thermometer?
Calibration is the process of comparing indicated value of a measuring instrument with a reference value to determine the degree of difference.
One method using radiation thermometer is to measure blackbody furnace or similar object that has achieved a reference temperature and then check the difference between that indicated value and the reading of radiation thermometer.
Calibration and adjustment are not the same thing. Calibration is primarily for checking the difference in measured values. Adjustment, repair, or replacement should be considered as needed.
Why is calibration important?
The readings radiation thermometer may vary depending on the operating environment and the condition of the equipment. Especially when using the readings as crucial information for quality control, process control, or testing, it is important to regularly check the condition of the readings.
Checking the measured values
Compare the current reading to the indicated value and check the difference.
Understanding change
Comparing this with past calibration results provides insight into trends in how indicated value are changing.
Quality control
This can be used for reliability management when using measured values for quality control or process control.
The calibration cycle is determined by considering factors such as frequency of use, operating environment, required accuracy, past calibration results, and the impact of deviations in measured values.
What is proofreading?
How do you determine the calibration cycle?
Chapter 6
Chino's radiation thermometer, temperature calibration equipment, and calibration services
Chino offers not only radiation thermometer, but also temperature calibration-related products such as standard radiation thermometer for calibrating radiation thermometer thermometers, blackbody furnaces for comparative calibration, and blackbody furnaces for fixed-point calibration.
IR Thermometers
We offer a lineup of non-contact radiation thermometer for measuring surface temperature, tailored to various applications and temperature ranges.
Standard radiation thermometer
We provide standard radiation thermometer for use in calibrating radiation thermometer.
blackbody furnace for comparative calibration and fixed-point calibration
We provide blackbody furnaces for comparative calibration and blackbody furnaces for fixed-point calibration used in the calibration of radiation thermometer.
Supports fixed-point calibration in high-temperature ranges.
Chino calibration tests are available for radiation thermometer and include calibration using the Cu point, Pt-C point, and Re-C point. The Re-C point is 2474°C.
Chino Calibration Testing's calibration services for radiation thermometer have calibration points set according to models and calibration method. For detailed information on the scope and conditions, please refer to the latest service information.
Chapter 7
From "measuring" to "reliable and usable" temperature measurement.
In non-contact temperature measurement, it is important to consider the entire measurement system, including not only the performance of radiation thermometer itself, but also the object being measured, the measurement environment, installation conditions, emissivity settings, and inspection and calibration.
Measure
Select radiation thermometer that is suitable for the application and the object being measured, and take measurements under appropriate conditions.
confirm
We will check the measurement conditions such as emissivity, distance, angle, reflection, and optics.
Calibration
The state of indicated value is checked by comparing it with a reference temperature.
Utilize
We utilize measurement data with controlled reliability for quality control, process improvement, equipment management, and more.
Chino provides products and services related to temperature measurement, including radiation thermometer, temperature calibration equipment, standard radiation thermometer, Chino calibration testing, and JCSS calibration testing.
FAQ
Frequently Asked Questions about Non-Contact Temperature Measurement and Calibration
Q. Are radiation thermometer more accurate than contact thermometers?
A direct comparison is not possible. While radiation thermometer have the advantage of being non-contact, they are affected by factors such as emissivity, measurement distance, reflectivity, and surface condition. It is important to choose a method that is suitable for the application and measurement conditions.
Q. What should I do if I don't know emissivity?
One method involves first identifying candidate values based on the material and surface condition of the object, and then verifying the conditions by comparing them with other measurement methods, such as contact thermometers. The most suitable method for the actual object will be considered, including the measurement conditions.
Q. Do radiation thermometer also need to be calibrated?
When using measured values as important decision-making factors for quality control, process control, testing, etc., it is important to regularly check indicated value and calibrate as needed. The calibration cycle should be set according to the application and working conditions.
Q. What is blackbody furnace used for?
These are used to achieve a reference radiation temperature, such as when calibrating radiation thermometer. Chino offers blackbody furnaces for comparative calibration and blackbody furnaces for fixed-point calibration.
Q. What is the difference between Chino calibration and JCSS calibration?
JCSS calibration is performed by registration businesses under the Measurement Law's traceability system. Chino calibration, on the other hand, is a calibration test conducted according to Chino standards. The type of calibration required is selected based on the intended use and specific requirements.
Let's look at the difference between JCSS calibration and general calibration.
Summary
Non-contact temperature measurement requires consideration of both "measurement conditions" and "reliability management."
radiation thermometer are convenient devices that can measure the temperature of objects that are difficult to measure with contact methods, such as high-temperature objects or moving objects, without contact.
However, measured values can vary depending on conditions such as emissivity, measurement distance, angle, reflection, and optics. Therefore, it is important to design the measurement system, including the actual measurement environment, in addition to selecting the equipment.
Furthermore, when measurement values are used as important decision-making factors in quality control or process control, continuously checking the status of the measurement values through inspection and calibration leads to reliable temperature control.
Select radiation thermometer → Install it properly → Check the measurement conditions → Calibrate it → Utilize it
Location information
Related information about Chino
IR Thermometers
Calibration
Calibration services and equipment
Inquire about non-contact temperature measurement and calibration.
We can advise you on selecting radiation thermometer, emissivity, measurement conditions, calibration methods, and calibration cycles, tailored to your specific temperature measurement requirements.
Inquire about non-contact temperature measurement and calibration.
