obesepanda

Resolution 0.1 degrees Celsius (0.1 degrees Fahrenheit) Yes that is right, the resolution is 0.1 degrees. The Model is the YK-001. Yes I understand the field of view will increase as distance increases but I didn't realise it would increase so much from a 2.5-5 cm increase. Also, if the aim is to measure body temperature and we know that the reading will decrease with distance, can't the measured distance compensate for the decrease? No worries all, thank you for the info. I think I understand... if the device says 3-5 cm accuracy then it means that at that temperature the 'field of view' will most likely fit within the forehead region. Anything greater will perhaps expand to include other areas of the head where the average temp of the entire area will be returned.

Yeah, the suggested operating range is 3-5 cm. Here is an example of measurements taken at 3,5,7.5 and 10 cm Distance (cm) Reading 3 36.8 5 36.6 7.5 36.5 10 36.3 But, I am struggling to understand why the known distance cannot be used compensate for the temperature decrease. Thanks

Thank for your the reply, so the distance is being compensated by taking the average over the entire field of view? What I am trying to understand better is why the temperature reading drops by a whole degree when increasing the distance between the forehead by just 2 cm. Surely the forehead is still within the field of view, if so why can't the device calculate the distance from the forehead and produce the same reading as before? Thank you

I have been trying to research and understand whether handheld infrared thermometer guns use ultrasonic sensors. I am investigating the accuracy of these devices and understand that due to the inverse square law when the distance between the radiation source and the measuring device increases by 2 the intensity of the infrared radiation would decrease to 1/4. What I am trying to understand is whether distance is factored into the algorithms used to convert surface temperature to a 'body temperature' reading as this seems like an important factor. The only thing I have been able to find is that depending on whether you want to to measure close range or long range the device would require a different aperture known as the D/S ratio. Any help or a point in the right direction would be very helpful and much appreciate. Thank you