Do you understand the 3 steps to test high-temperature devices?
First step, open the oven door.
The second step is to put the high-temperature components in.
Step 3: Close the oven door.
Do you think this is a joke? Actually, this is true. Two engineers from ADI, Jeff Watson and Gustavo Castro, once did an interesting experiment - putting components into a rotating oven. It was used to show that two components designed by ADI, the low-noise instrumentation amplifier AD8229 and the high-temperature accelerometer ADXL206, are fully suitable for high-temperature environments!
Components inside the rotary oven
The special thing about these two devices is that they are completely redesigned to work in extremely high temperature environments, including underground oil and gas exploration, geothermal, etc.
In the experiment, engineers demonstrated the operation of the accelerometer by rotating it and the operation of the instrumentation amplifier by measuring temperature. The position of the thermocouple is tracked as the oven rotates, and the temperature drops as the thermocouple reaches the front and bottom of the oven. The temperature reaches its highest point as the thermocouple moves up and closer to the heating element.
Measurement method demonstration
The result of this interesting experiment is that there is no problem at all. Both devices still work normally under such high temperature.
You should know that the normal temperature of an oven is around 250℃. What does that mean? Let's take a look at some data!
The temperature of underground drilling operations exceeds 200°C.
The temperature near the aircraft engine is between –55℃ and +200℃.
The temperature near the gearbox of a car motor is between 150°C and 200°C.
......
Designed specifically for high-temperature working environments, it is very suitable for underground drilling operations and uses a dielectric isolation process to avoid leakage current at high temperatures. The selected design architecture can compensate for the low VBE voltage at high temperatures. It is particularly good at measuring small signals and can provide industry-leading 1 nV/√Hz input noise performance. In addition, the AD8229 has a high common-mode rejection ratio (CMRR) to prevent interference signals from corrupting data acquisition. The CMRR increases with the increase in gain, providing high rejection performance when it is most needed. And the AD8229 is one of the fastest instrumentation amplifiers currently available. Using a current feedback architecture, it can provide high bandwidth at high gain, such as 1.2 MHz when G = 100. The architecture design also includes circuits for improving the settling time of large input transient signals.
Moreover, due to the excellent distortion performance of AD8229, it is also very suitable for demanding applications such as vibration analysis. For the most demanding applications, AD8229 is available in 8-pin side-brazed ceramic dual in-line package (SBDIP). For space-constrained applications, AD8229 is available in 8-pin standard plastic small outline package (SOIC).
This is a precision, low-power, complete dual-axis iMEMS ® accelerometer in a 13 mm × 8 mm × 2 mm, 8-lead side-brazed ceramic dual in-line package (SBDIP) for use in high-temperature environments such as downhole drilling. This accelerometer integrates the sensor and signal-conditioned voltage output on a single monolithic IC. The full-scale acceleration measurement range is ±5 g, and it can measure both dynamic acceleration (such as vibration) and static acceleration (such as gravity). The typical noise floor is 110 μg/√Hz, so in tilt sensing applications, signals below 1 mg (0.06° tilt) can be resolved with a narrow bandwidth (<60 Hz). The bandwidth of this accelerometer is user-selectable using capacitors CX and CY on the X OUT and Y OUT pins. Depending on the application, bandwidths can be selected from 0.5 Hz to 2.5 kHz.
Click Watching
Send you little flowers
京公网安备 11010802033920号