# Thermal Imaging of people and background temperature

• Anand Sivaram
In summary, thermal imaging works by detecting EM waves emitted from objects with a temperature. It operates based on the temperature of 37C/98.4F/310K, which corresponds to 9.3um LWIR according to Wien's law. In scenarios where the atmospheric temperature is the same as the human body's temperature, thermal imaging would not be able to detect a person. However, in situations where the atmospheric temperature is higher, the shape of the person and their lower temperature due to sweating could still be distinguishable from the background.
Anand Sivaram
Any object with a temperature emits corresponding EM waves.
Thermal imaging works by considering our temperature of 37C/98.4F/310K, and it corresponds to 9.3um LWIR as per Wien's law.

I was thinking about the following summer scenarios in which how it would work.

1) If the atmospheric temperature is at the same 37C, human beings and all surroundings are at the same temperature. Would we be able to see a person using thermal imaging?

2) Even higher air temperature, let us say at 40C/104F, human beings might have lower temperature than the surroundings because of sweating. Would we be able to see a person still?

A thermal imager looks at the em radiation from a source. The air in between will have some input but the image would be dominated by the target and the actual background. After a day of serious cooking by the Sun, some of the background surfaces would be 'warm to the touch' (cooling rapidly by radiation into space) but there could be low contrast in an image of a body in front of those surfaces.
The shape of a target would also help to recognise it against a background, even if the background is relatively warm.

davenn

## What is thermal imaging and how does it work?

Thermal imaging is a technology that captures and displays the infrared radiation emitted by objects. It works by using a special camera that detects the heat signatures of objects and converts them into a visible image.

## How is thermal imaging used to measure the temperature of people and background?

Thermal imaging can be used to measure the temperature of people and background by capturing the infrared radiation emitted by their bodies and surroundings. The camera then converts this radiation into a temperature reading, allowing for non-contact temperature measurement.

## What are the benefits of using thermal imaging for temperature measurement?

One of the main benefits of using thermal imaging for temperature measurement is that it is non-invasive and non-contact, making it a safe and convenient method. It also provides real-time results and can measure multiple temperatures at once, making it efficient for large groups of people.

## Are there any limitations to using thermal imaging for temperature measurement?

While thermal imaging is a useful tool for temperature measurement, it does have some limitations. It is affected by external factors such as ambient temperature and humidity, and it cannot measure internal body temperature accurately. Additionally, it may not be suitable for use in extreme temperatures or with certain types of clothing or barriers.

## How is thermal imaging used in medical and security settings?

In medical settings, thermal imaging is used to detect changes in body temperature, which can indicate potential health issues. In security settings, it can be used for screening and detecting individuals with elevated body temperatures, which may be a sign of illness or fever.

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