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The parameters of the thermal imaging camera determine the specific pros and cons of its performance, so it is necessary for us to understand it accordingly. This article will specifically introduce the common technical parameters of thermal imaging cameras.
As a precision instrument widely used in various industries, thermal imaging cameras have received close attention. The technical parameters of the infrared thermal imaging camera determine its performance and working effect. The following are some introductions of each parameter.
The spatial resolution of thermal imaging cameras is usually expressed in units of mrad (milliradians). The smaller the value of mrad, the higher the resolution. The radian value multiplied by the radius is approximately equal to the chord length, which is the diameter of the target.
The temperature resolution of the thermal imaging camera refers to the small temperature AT at which the thermal imaging camera enables the observer to distinguish the target radiation from the background. Civil thermal imaging products usually use NETD to express this performance index.
The response of the infrared detector to the incident radiation of each wavelength is called the spectral response. General photodetectors are selective detectors (usually infrared detectors can measure infrared radiation in the three atmospheric window bands).
The parameters of temperature difference resolution sensitivity and system spatial resolution, and are subjective evaluation parameters related to the observer. It is defined as using a standard periodic test card (that is, 4 strips with an aspect ratio of 7:1). In the case of the figure, the minimum target that the observer can distinguish, the background temperature difference, during the above observation process, the observation time, system gain, signal level value, etc. can be adjusted to the best state without limitation.
The frame rate is the number of complete images produced by the thermal imager per second, and the unit is Hz. The general TV frame rate is 25 Hz. According to the frame rate of the thermal imager, it can be divided into two categories: fast scan and slow scan. The equipment used in the power system generally uses a fast scanning thermal imager (frame frequency above 20Hz), otherwise, it will cause some work inconvenience.
Detection, recognition, and recognition distance
These are performance indicators that users are very concerned about. For each user's own quality and the difference in image quality given by the instrument, as well as the strict definition of difficulty (detection performance is a complex function of multiple factors). The detection distance is the maximum critical point that can clearly distinguish the target from the background and some attention-grabbing targets; the recognition distance is the distance at which the detected target can be roughly divided into types if the vehicle is still a ship; the recognition distance is to distinguish the types Based on the subdivision, such as whether the vehicle is a tank or a car.
Display record method
Display recording mode refers to video monitor or liquid crystal display or light-emitting diode display; display recording party tape video recording, floppy disk or PC card recording, electronic memory recording; output interface, printing type or care image, etc. The more advanced ones are PC card storage and electronic storage.
In order to improve the accuracy of temperature measurement, the upper and lower limits of the temperature that can be effectively measured are usually divided into multiple different temperature range sections. Determine the temperature measurement range according to the temperature range of the measured object, and select the infrared thermal imager with the appropriate temperature range. It is not that the larger the temperature measurement range, the better, as long as the temperature measurement range meets the user's requirements. Generally, when an infrared thermal imager measure objects above 650°C, it needs to be equipped with a corresponding high-temperature lens.
The minimum temperature change that an imager can distinguish reflects the sensitivity of an infrared thermal imager to temperature. The lower the thermal sensitivity, the smaller the temperature change that the imager can observe. The main purpose of the infrared thermal imaging camera to test the measured object is to find the temperature fault point through the temperature difference. It does not make much sense to measure the temperature value of a single point. The main purpose is to find the relative hot spot through the temperature difference and play a role in pre-maintenance. . Therefore, when choosing an infrared thermal imager, according to the actual situation, the customer should choose the thermal sensitivity that meets their own detection.
The working band refers to the response wavelength range of the infrared detector selected in the infrared thermal imager, generally 3～5μm or 8～12μm.
We can refer to the above technical parameters when choosing an infrared thermal imager, and match them according to specific application scenarios. If you still want to know more information related to the infrared camera after reviewing the above content, you can contact us for a detailed solution.
As a professional manufacturer of thermal imaging cameras, we have accumulated rich manufacturing experience in this field. We have a complete production team and strict quality management system, which can carry out strict quality control from product design to export. We can also provide high-quality services and effective solutions according to customer needs. If you are interested in our thermal imaging cameras, please contact us immediately!