The principle of making a blackbody furnace

Overview: WJL-21 medium-temperature blackbody furnace is used as a standard radiation source for non-contact temperature measuring instrument calibration and indexing. Second, the main technical parameters:

1. Radiation aperture 50 or 25 (light bar) 2. Temperature range: 300-1300 range can be set arbitrarily 3. Temperature control accuracy 1250 1, stability 1 10min 4, working power supply 220V 50Hz 5, maximum constant temperature power consumption is not more than 1kva 6, maximum heating power consumption is not more than 3kva 7, heating time: room temperature to 1300 not more than 2 hours 8, temperature measurement thermocouple:

Second-class standard platinum rhodium 10 - platinum thermocouple (purchased separately) 9. Temperature control thermocouple: industrial platinum rhodium 10 - platinum thermocouple (purchased separately) 10. Heating element: one end is fixed with a double-threaded silicon carbon tube (due to the fragility of the heating tube, the user must pick up and transport it when delivered) 11. Black body cavity:

50 conical cylindrical composite cavity cone tip angle = 30 ° silicon carbide material 12, the external dimensions 700 260 400 (length, width and height).

Tai'an Demei blackbody furnace, also known as blackbody radiation source, is divided into cavity blackbody furnace and non-point source blackbody furnace.

Cavity blackbody furnace: a necessary product for laboratory standard construction, used to calibrate infrared temperature measurement qiang and thermal imaging tester, cavity blackbody furnace through a certain cavity depth, internal blackening treatment, so that the electromagnetic radiation entering the cavity has very little energy reflected in each incident on the inner wall, so that after many reflections and absorption in the cavity, the electromagnetic radiation is almost completely absorbed to achieve high emissivity. Emissivity of general cavity blackbody furnace.

Non-point source blackbody furnace: a kind of blackbody radiation source that can see the target surface with the naked eye, through high conductivity, high thermal insulation target bottom and blackening treatment, to achieve the national emissivity, stability, uniformity, such a blackbody furnace absorbs less electromagnetic radiation, through artificial treatment of emissivity, mainly used to calibrate infrared thermal imaging testers, the thermal imager on the market is generally small and has a larger viewing angle, and the non-point source blackbody furnace surface is relatively large, which can meet the needs.

Infrared BAI

Thermal imaging technology is a passive, DU non-contact detection and recognition technology, DAO can use the infrared radiation signature image formed by the temperature difference between the target and the back background or the difference in radiation between the various parts of the target to find and identify the target, and its two basic functions are temperature measurement and night vision.

Temperature measurement, which can realize non-contact long-distance temperature measurement and fault detection, has the advantages of simple and intuitive, safe and accurate, efficient and time-saving and all-weather work. Night vision, i.e. the ability to easily detect and identify targets in the absence of light, has the advantages of all-weather operation, no fear of bad weather, long range and superior stealth.

The earliest application of infrared thermal imager originated in the military field, and was widely used in power inspection, electrical equipment maintenance, industrial automation, inspection and quarantine, security monitoring, forest fire prevention, fire rescue, police law enforcement, outdoor sports and other traditional civilian fields, as well as autonomous driving, smart home, Internet of Things, artificial intelligence, consumer electronics and other emerging fields.

Nowadays, there are also outdoor enthusiasts who love to wander, and they can clearly find small animals hiding in the woods.

The working principle of the thermal imaging bai instrument, catching the heat source, if zhi is used in the desert during the day, it is a dao

The high-end toys have a limited working temperature and can only be used at night or when the temperature is low, it can see through the wall and see the outline of the surface temperature. She can't see what it looks like, but she can see your movements, every movement, but now there are precautions, such as anti-infrared camouflage, as well as his distance and penetration.

The explanation on the first floor is correct, we used it when we were on a mission, and it should be in my photo album.

If there is really such a device, do the police need to be familiar with the terrain when they break into the house to catch the bad guys? If there really is such a device, will the hostage-taking incident in Moscow still be a result of so many deaths and injuries? Thermal imagers can penetrate grass and sand at best, and it's nonsense to say that you can see people through walls, and don't talk nonsense if you haven't seen it.

I watched too many movies in Hollywood!!

As soon as they were pasted, they all came in

Simply put, every student.

Everything is emitting heat, it's just a matter of high and low.

Thermal imagers can represent things according to their temperature

When there are creatures, you can't hide from the low temperature in the background!

The thermal imaging camera is a kind of instrument that can emit infrared rays or heat through thermal induction. You can see each other's activities through obstacles. It's a peep instrument, and the average person in the DAO doesn't have this thing. If your neighbor lives upstairs above you and uses this thing against you, you're in for a miserable situation. There's no way to hide!

Explain that he can spy on you every move. It must be to grasp your movements, and then to control you and influence you. However, legally speaking, he has violated your right to privacy, and you have the right to have it removed.

But if you can't do it, if you can catch it, it depends on who the other party is! Some people won't let you grab the handle and evidence even if they get it. If you don't believe me, you can try.

The person who has this thing is already worth thinking about, and it is even more worth thinking about using this kind of thing to peep at you and influence you! This shows that he can peep at you as much as he wants, influence you as he wants, and control you as he wants. Your life is not in the hands of others, you should live honestly.

If you want to eat something, eat something! Why don't you get someone else? Did you offend someone?

Reflect on it! If you mess with you like this, you'll have to be careful!

Anything that generates heat emits infrared light.

Thermal imagers are built on this principle.

Thermal imager is based on the probe.

BAI Measurement Position.

DU's thermal infrared (or ZHI called thermal radiation) comes to work simply DAO

If you aim the camera at one place, the part with more heat and more temperature will appear red on the camera screen, and the part with less heat and low temperature will appear yellow, so you can only see the general outline of the object on it.

Therefore, it is indistinguishable for objects that cannot be stolen by thermal infrared rays or objects whose temperature changes are less than the sensitivity of the thermal imager.

As long as the heat can penetrate the surface, yes.

For example, when people wear clothes, they can basically see the whole human body with infrared imaging, and if they wear more clothes in winter, they can only see the head and hands, and there may be only a small amount of heat conduction to the surface of the clothes, at most they can see a faint outline.

Infrared imaging, which measures the "temperature of the outermost substance".

So I think it's not possible to see through walls, and it's hard to wear thicker clothes (unless the clothes have good thermal conductivity and can conduct people's body temperature to the surface of the clothes). Below is a picture of the human body taken with a red-eye camera** (in autumn, the clothes are a little thicker).

Some application scenarios will be checked with thermal imaging, such as floor heating, to see if the floor is hot, in fact, only the heat seeps out for the imager to perceive, the essence is "what penetrates what", the fact is that the heat penetrates the floor, not the infrared camera penetrates the floor.

For the answer of other netizens that "you can see through the wall", you can judge whether it is right or wrong. Grasping the essence of the principle is actually very easy to understand. Infrared imaging, which measures the "temperature of the surface of an object", can be used to infer what may be inside the surface temperature and thermal images of the object.

Infrared night vision devices include infrared thermal imagers, passive infrared night vision devices are also called infrared thermal imagers, but in fact, everyone calls passive infrared night vision devices infrared thermal imagers, thermal imagers can penetrate objects to a certain extent, but the object is too thick to penetrate, give you an example of penetrating the wall.

Detection of underfloor heating. Active infrared night vision devices cannot penetrate walls, and they must illuminate the target with an infrared searchlight to carry out imaging.

Infrared night vision device refers to using the machine itself to emit infrared shimmer light and then see the object clearly.

Thermal imagers, on the other hand, judge and see objects clearly by receiving infrared rays emitted by them.

Neither thermal imaging cameras nor infrared night vision devices are currently on the market that can penetrate walls. Through-the-wall can only consider higher-end products.

The thermal imager can see through the wall, and the domestic quality and reliable thermal imager is recommended by Arrow Optoelectronics. It is still the leading enterprise of the national nuclear high-tech base, which is relatively good and worth recommending!

Infrared, far infrared, are all light waves, infrared cannot penetrate cement, no matter how thin it is, unless it transmits light, far infrared is thermal radiation, thermal imaging is to detect surface thermal radiation, heat must be conducted to the surface to be detected, so thermal imaging cannot penetrate the wall, unless the heat source is conducted to the surface.

Preliminary understanding of the principle and operation of vacuum coating, to the measurement of film thickness.

n Experimental principle.

Vacuum coating is to place the solid material in a vacuum chamber, and under vacuum conditions, the solid material is heated and evaporated, and the evaporated atoms or molecules can be freely diffused on the wall of the container. When some processed substrate material is placed in it, the evaporated atoms or molecules will be adsorbed on the substrate to gradually form a thin film. There are two methods of vacuum coating, one is evaporation and the other is sputtering.

In this experiment, the evaporation method was used. The material from which the film is made is heated and evaporated in a vacuum, allowing it to accumulate on a suitable surface.

l Vacuum system (DM-300 coating machine).

l Evaporation source.

The shape of the evaporation source is shown in the figure below, which is roughly divided into spiral type (A), basket type (B), fork type (C) and shallow boat type (D).

l The principle of evaporation source selection.

1. It has good thermal stability, the chemical properties are not active, and the vapor pressure of the heating brother muffler itself should be sufficient when the evaporation temperature is reached.

2 The melting point of the evaporation source is higher than the evaporation temperature of the evaporated product. The heater should have a large enough heat capacity.

3. The inter-meltability of the evaporation material and the evaporation source material must be very low, and it is not easy to form an alloy.

4. It is required that the material used in the coil-shaped evaporation source can have good wetting with the evaporation bending material and have a large surface tension.

5. For those who are not easy to make filaments, or when the surface tension between the evaporation material and the filamentous evaporation source is small, the scaphoid evaporation source can be used.

The standard is the standard on the black-body furnace, such as the second-class standard platinum resistance, etc., the black-body furnace only provides a calibration environment, and the infrared thermometer is the object of proofreading. Just like a glass liquid thermometer for verification work, the standard is a second-class mercury thermometer or platinum resistance, and the thermostat is the temperature field. As for the emissivity, it should be related to the emissivity of the blackbody furnace, and the emissivity of some infrared thermometers is fixed and cannot be adjusted!