DDIT designed for non-contact linear position displacement

13th September 2018
Source: Kaman
Posted By : Alex Lynn
DDIT designed for non-contact linear position displacement

The Measuring Division of Kaman Precision Products has announced the release of a new eddy current measurement system, the Digital Differential Impedance Transducer (DDIT). The DDIT is designed to provide a digital interface for high speed eddy current measurement systems, with resolution in the micro-inch range, at bandwidths as high as 60kHz. 

It is ideal for use in applications for fast steering mirrors, magnetic bearing active control, shaft vibration, image stabilisation, and adaptive optics. Using a standard 9D connector for reading data, power, and control signals, the system operates from a single power supply with a voltage range of eight to 28V.

Kaman’s custom sensors, signal processing, analogue to digital converter, and custom calibration system are used to deliver each high precision Digital DIT sensor system. The DDIT is available in three configurations: The Digital System is designed to interface directly to an embedded controller with a master serial peripheral interface (SPI) bus. The ANA (analog) System provides linear analog voltage, with a full range output signal of 0-5VDC with a null position of 2.5VDC. The FE System is designed for field-programmable gate array (FPGA) interface for high speed operation, with data rates as high as 128 kHz, 48 bits of data, 60 kHz bandwidth, and no internal firmware.

Kaman sensors are designed and tuned for specific applications. The DDIT system utilises two matched sensor pairs for optimum operation for each channel. The input signals are filtered and scaled to provide optimum operation, remove common mode noise, and provide a drive signal. The signal processing also provides digital filtering as part of the signal conditioning to reduce signal noise.

Kaman’s Digital DIT system samples data at eight times the data rate. The oversampling provides higher resolution at the defined data rate. This results in signal resolution that is eight times better than a system sampling at the Nyquist rate.

 

Downloads


You must be logged in to comment

Write a comment

No comments




Sign up to view our publications

Sign up

Sign up to view our downloads

Sign up

European Microwave Week 2018
23rd September 2018
Spain Ifema Feria De Madrid
Connected World Summit 2018
25th September 2018
United Kingdom Printworks, London
IoT Solutions World Congress 2018
16th October 2018
Spain Barcelona
Engineering Design Show 2018
17th October 2018
United Kingdom Ricoh Arena, Coventry
Maintec 2018
6th November 2018
United Kingdom NEC, Birmingham