Enquiry for 9-axis IMU

Hi

 

I have been involved in selecting 9-axis MEMS IMU’s to be placed in the drill head for some directional drilling applications. I’m interested in your products ADIS16488, ADIS16480, ADIS16407, ADIS16405 due to their small sizes and low power consumptions, and would like to make some enquires about their functionalities and performance.

 

 

The IMU of interest will undergo a lot of vibrations while drilling is taken place, thus vibration is one of our major concerns. In terms of vibration, I’m interested in three aspects of the sensor:

 

- Whether the product is suitable for drilling applications where it has to undergo continuous vibration

 

- Whether the components (accelerometer, gyroscope and magnetometer) can survive continuous vibration environment. Would you be able to provide information on the maximum vibration environment (both magnitude in g rms and frequency in Hz) the sensor could function under? (not shock survival)

 

- How well the sensor can perform under such environment

 

 

Since not mentioned in the data sheet for the products ADIS16488, ADIS16407, ADIS16405, I was wondering if there are any specifications on the static and dynamic orientation accuracy of these sensors?

  • 0
    •  Analog Employees 
    on Dec 18, 2015 11:48 PM

    Thank you for your inquiry.  We qualify the devices to 10grms of vibration, but these products have been used in applications that have higher levels of exposure.  Do you have a vibration profile (spectral density vs frequency) that you would like us to take a look at?

  • Thank you for your reply.

    We are still at the beginning of our selection process and haven't got a chance to measure the vibration profile during drilling. But 10 g rms should be in the range for our application as our current orientation sensor (not MEMS) also has a vibration tolerance of 10 g.

    As it's not mentioned in the data sheet, are these products suitable for directional drilling applications?

  • 0
    •  Analog Employees 
    on Dec 30, 2015 3:32 AM

    We don't typically make specific product suggestions, based only on a generic application space, but we do see a lot of early consideration and design work for controlling drill heads, so you are on in line with what I have seen so far.  Without a more complete view of your key performance requirements and application environment, it is hard to offer much more.  As your architecture and requirements matures, we certainly look forward to working with you to help narrow your focus on the right product family. 

  • Hi siqi,

    I work on MWD drilling instruments for many years. I have ADIS16480 in my hand and I do a lot test on it.

    I'm sure it can not work on down hole instruments, the reason:

    1, ADIS16480 work current is  too high, it will be very hot if the down hole temperature is high.

    2, This is more series problem that ADIS16480 signal connector can not withstand much vibration !!!!!!!!!!!

    3, For our application, ADIS16480 size is too big.

  • Hi siqi,

    Another things you should consider, like ADIS16480 only supply SPI signal, you need another CPU board then

    you can use it. But CPU board come from AD company which already have demo software inside, the board size

    is too big that can not put inside down hole instrument. So you have to use your small size CPU board which mean you have to write the interface code by yourself !!!!!!!!!!!!  Write this embedded software is not easy.