How does a blackbody furnace calibrate the temperature of a thermometer

1. Definition of a black body: A black body is an idealized object that can absorb all incident radiation encountered on its surface and perfectly re-radiate energy at all wavelengths. The design of blackbody furnaces in reality is close to this ideal characteristic

2. Radiation characteristics: The inner wall of the blackbody furnace is coated with high-emissivity materials, making it as close as possible to the radiation characteristics of an ideal blackbody. This ensures the uniformity and stability of the radiation field inside the furnace.

3. Temperature control: The blackbody furnace is equipped with temperature sensors and heating elements inside. The heating elements are regulated through a precise control system to maintain an extremely stable and uniform temperature distribution

4. Temperature setting: Users can set the target temperature of the blackbody furnace as needed. The control system inside the furnace ensures that the deviation between the actual temperature and the set temperature is minimized.

Calibration process

1. Preheating: Preheat the blackbody furnace to the required temperature and stabilize it

2. Measurement: Position the thermometer to align with the outlet window of the blackbody furnace and start reading the energy radiated by the blackbody.

3. Data recording: Record the readings of the thermometer and compare them with the known temperature of the blackbody furnace.

4. Calibration: Analyze the measurement data and calibrate based on the deviation between the reading of the thermometer and the actual temperature of the blackbody furnace. It may be necessary to adjust the calibration parameters of the thermometer to ensure that its readings match the actual temperature.

5. Repeated measurement: To ensure accuracy, the above process is usually repeated at multiple different temperature points to fully establish the temperature response curve of the thermometer. Through the above steps, the blackbody furnace provides an accurate reference temperature source for the thermometer, enabling the temperature readings of the thermometer to be accurately calibrated and verified. This is of great significance for scientific research, industry and other fields that require precise temperature measurement.

It refers to the horizontal and vertical field of view range that the lens can capture. This viewing Angle range is usually determined by the focal length of the lens and the size of the sensor. The following is the basic method for calculating the field of view range of an infrared thermal imager lens under normal circumstances:

1. Understand the sensor size: First, it is necessary to understand the size of the sensor used in the infrared thermal imager, which is usually given in inches or millimeters, for example, a 1/2-inch sensor.

2. Determine the focal length: Obtain the focal length of the lens, which is usually given in millimeters, for example, 25mm.

3. Calculate the field of view: The field of view can be calculated by the following formula:

Field of view =2 arctan(sensor size/(2 focal length)), where arctan is the arctangent function, and the units of sensor size and focal length must be consistent

4. To convert to degrees: The field of view Angle calculated above is usually in radians. If it needs to be converted to degrees, it can be multiplied by 180/π. Through the above steps, you can calculate the field of view range of the infrared thermal imager lens. This is helpful for understanding the range that the thermal imager can cover in practical use and is of great significance for choosing the appropriate equipment and the applicability of the scene.

How to calculate the viewing Angle range of an infrared thermal imager

The so-called equivalent temperature difference refers to the minimum temperature difference that the detector can precisely detect when the signal-to-noise ratio is 1. In simple terms, it is its minimum temperature resolution. We can understand this concept through a simple example. If the equivalent temperature difference of a thermal imager is 0.1℃, then it can capture a 0.1℃ temperature change on the surface of an object. However, if the equivalent temperature difference is reduced to 0.01℃, it can detect even smaller temperature differences. Obviously, the smaller the equivalent temperature difference, the more sensitive the detector will be and the more subtle the heat information it can capture. This is very important for many application scenarios. For instance, in medical diagnosis, highly sensitive thermal imagers can accurately capture minute local temperature abnormalities in the human body, which is conducive to the early detection of diseases. For instance, in industrial inspection, it can promptly detect the slightest temperature rise on the surface of equipment, providing a reliable basis for fault early warning. However, we should also note that the equivalent temperature difference is not necessarily the smaller the better. Because its reduction usually means an increase in the manufacturing difficulty and cost of the detector. At the same time, overly sensitive detectors may also be disturbed by environmental noise, which in turn affects the imaging quality. Therefore, in practical applications, we need to balance the equivalent temperature difference index according to specific requirements. For some occasions where the resolution requirement is not very high, models with a slightly larger equivalent temperature difference can be selected. This can not only meet the demand but also control the cost. For professional applications that pursue ultimate performance, it is naturally necessary to choose high-end equipment with a lower equivalent temperature difference. In conclusion, the equivalent temperature difference is a key indicator for evaluating the performance of infrared thermal imagers. Only by deeply understanding and grasping its characteristics can we choose the thermal imaging equipment that truly suits our own needs.

What does the equivalent temperature difference parameter in an infrared thermal imager refer to?