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Annual Report 2012
Handheld InfraRed Non-Contact Thermometer
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Thermometer General Description
The Infrared (IR) thermometer, allows non-contact measurement of surface temperatures by analyzing the invisible, infrared spectrum emitted from an object. The IR thermometer uses Melexis' advanced infrared technology to measure fast and quick surface temperature of objects without physical contact. This technology allows safe measurements and cuts measurement time to almost zero with the ability to measure several reading per second. The nature of this measurement technique prevents contamination and damaging of the measured object.
For OEM this technology is available in the MLX90614 as an intergrated digital non-contact thermomter in a small TO-39 can.
Thermometer Features and Benefits
- contactless temperature measurements between -40°C and +380°C
- one-button control
- point and shoot principle
- continuous capturing of minimum and maximum values
- Resolution: 0.1°C or °F
- Response Time: 0.5 second
- Infrared Accuracy: Avg 1.5°C over whole range
- Distance Spot Ratio: 1.25(8cm spot at 10cm distance)
- Viewing angle: 35°
- Emissivity: 0.95
Thermometer Related Products
Digital, plug & play, infrared thermometer in a TO-can
Digital, plug & play, infrared thermometer in an ultra small TO-can
IR Thermometer Manual
a free guide to temperature sensors and their uses
Thermometer Environmental Information
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Thermometer In The Press
Thermometer Frequently asked Questions
MLX90247 RoHS Status
Melexis confirms that the MLX90247thermopile devices, the MLX90614 and MLX90615 infrared thermometer sensor family and the EVB90614 and EVB90615 are RoHS compliant.
Use of MLX90247 for ear thermometers regarding safety for the users: The MLX90247 is a low-tension low-power device. A certificate of suitability of use for medical purposes should however be obtained at the level of the ear-thermometer, by the manufacturer of the ear-thermometer.
Reducing the MLX90247(DSA Type) FOV
Making a thermometer with a +/-1 degree accuracy with the MLX90247 will be very difficult, certainly for small FOVs. I advise not to use this component. We do have calibrated IR thermometers. This is the better choice for your challenge.
MLX 90247 readings
The MLX90247 is a thermopile sensor giving a voltage output depending on the temperature of the object it sees. However, this is a purely analog device without any internal calibration. If you are making a thermometer, you will have to calibrate the setup (MLX90247 + electronics) you made yourself. Our new MLX90614 on the other hand is a smart sensor with integrated electronics and comes factory calibrated. Emissivity of the object does influence the sensor reading, but in general this is only an issue for metals which have a low emissivity. Compensation for low emissivity can be done through calculation if you know the emissivity of the surface you are measuring.
MLX90614 Slow to Reach Temperature
I am really happy you found the problem!! Every unintended object that enters the Field Of View of IR thermometer will affect measurements' accuracy. We have this note in the MLX90614 data sheet, FAQ section, too.
infrared temperature sensor emissivity
A thermometer with variable emissivity will take into account the emissivity of the object being observed. For objects with low emissivity (like metals) this is required to get a correct reading. However, if the aim is only to observe repeatability of the process, and not the exact temperature, emissivity compensation is not needed.
the plastic material that is usable like windouw between the IR temp sensor and measured area
You can use a very thin (<0.1mm) foil of PolyEthylene. That material is also used as protection for ear thermometers. You may need to make a small adjustment in the emissivity compensation setting of the sensor to compensate for the small absorption of the polyethylene. It is also important to have the foil at the same temperature as the sensor. Another option might be not to use a protection and clean the sensor regularly with alcohol and a lint free cloth. When the sensor comes this close to the body, it is possible that the metal housing of the sensor is heated by the body. This can lead to erroneous measurements. I would advise to protect the metal housing of the sensor as much as possible with a standard plastic, taking care the plastic does not get in the viewing angle of the sensor of course.
MLX90614xAC and MLX90614ESF-DAA
No, the MLX90614ESF-DAA is a thermometer with "medical accuracy" +/-0.1C accuracy, 3V, but an FOV of 90 degrees.
MLX90614 View window
the only viable material that can be used is PolyEthylene, and preferrrably a thin sheet like used for ear thermometers. Compensation can be made using the emissivity coefficient.
Temperature measuring at the point
I have bought MLX90614ESF-AAA module and parallax MLX90614 Infrared Thermometer Module (#28040). The module works fine. But I need to measure temperature at the point, that means I need very small Field of View, just the point. I do not need other temperatures, such as environment between sensor and object. The point's radius is 5 sm. Also I need place the module 2-3 meter away from the measuring object. Is it possible? I understood about MLX90614-XCC and MLX90614-XCF module after the test, but I think this is not best solution for my needs. What is best way to solve this problem?
MLX90614 is a thermometer... So I wonder what more than temperatures you need to read from the device? There is raw data also, 0x03 for ambient 0x04 for IR sensor 1 0x05 for IR sensor 2 (irrelevant with single zone devices). The rest of the RAM is used by the MCU program and you can't get any useful readings from it...
I actually know, that MLX90614 is a thermometer, but I want to use it with smaller FOV and I need to know intermediate results to understand the calculating process... So, I would be grateful to you for your help with RAM table...it can save a lot of my time... Or can you give me some recommendations about using external optics?
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