I see what you mean.... I didn't read well the data sheet.... :shock:
Well, as I understand from the data sheet.... the sensor generates a voltage that is proportional to the amount of heat..... and a High sensitivite sensor at 100 V/W
So what I get is if you measure the temperature of a 60W bulb would create 100/60 V = 1.6V..... and I think that you are going to get that voltage between DET+ and DET- ....... But how hot is 60W?
Question
How is the measurement Watts related to temperature in terms of energy?
Asked by: KJ
Answer
A Watt is a unit of power, defined as the rate of energy transferred [per second]. The energy is usually defined as Joules; therefore, one Joule per second is one Watt.
When measuring heating effects, a unit of thermal energy known as a calorie is used. One calorie is 4.184 Joules.
Materials have a property called thermal capacity or specific heat. This is a measure of how many calories are needed to raise 1.0 gram of the material one degree Centigrade. The thermal capacity of water at 15 deg. C is 1.0 calorie. That is 4.184 Joules or 4.184 Watt-seconds. The entire energy could be transferred to the water in one millisecond at a rate of 4184 watts to produce the same temperature rise of one deg. C.
The thermal capacity of materials changes slightly with temperature primarily due to changes in density, and very dramatically at phase transitions, such as ice melting and water boiling
So that is were I get lost :?
So I read some other stuff and I got this:
A radiation thermometer exploits the principle that all objects emit infrared radiation (radiant heat) at a rate directly related to the temperature of the object†. The rate of emission increases
very rapidly as the temperature increases. At room temperature every object emits energy at a rate of about 470 watts per square metre, while a hot stove element at 500°C emits about 20,000 watts per square metre. Optical components inside a radiation thermometer (similar to
those found in an everyday camera) are used to focus the infrared radiation onto a solid-state detector where it is converted into an electrical signal. This signal is then manipulated electronically and finally read out as a temperature on a digital display.
There is also
emissivity, which is the ability of a surface to give off heat by radiation. The scale is 1.0 (perfect or complete emission of radiant energy) to 0.0. Most non-metallic materials have an emissivity between 0.95 and 0.8, for example: water (0.95), rubber (0.86 to 0.95), smooth glass (0.93) and paper (0.92 to 0.94). Metallic materials have a lower emissivity range, for example: aluminum (rough 0.05, oxidized 0.1 to 0.2) and steel (polished 0.13 to 0.4, oxidized 0.8 to 0.95).
But this is how far my curiosity took me... There is a law called Planck's Law, which somehow relates wavelength (in this case the one for infrared) to temperature in Kelvin, but that was more physics that I could take for a day :lol:
Maybe I am just missing the whole thing, and I am overthinking it... anyone?
Ivancho