TELEMETRY-2

Dear all,

In the previous post I gave an introduction about Telemetry. Now I am giving more details for your convenance. I hope this series of article will help you in increasing your general knowledge.

In general, the resulting values need to be brought into a suitable form so that they can be tracked.

Special attention requires the transmission of DC signals, as obtained eg resistive or capacitive sensors (eg voltage change to a constant current flows, temperature-dependent resistance). Suitable measures pulse train is such a measuring voltage to an AC voltage or a put, so that supply voltage variations and temperature drifts. Transmission modules do not simulate the change of measured value. suitable for this purpose such as a pulse train whose pulse rate or pulse duration of resistance or capacitance of the sensor is different.

The transmission frequency of the telemetry transmitter may be modulated by such a pulse sequence or with a sensor directly from the supplied AC signal.

In the receiver this signal is recovered by suitable demodulation and derived from the corresponding measurement value. An applied method for analog measurement
signals, for example, a pulse shaper with low pass filter.

Today, virtually only digital Telemetries are common. The recorded measurement is implemented locally using an analog-digital converter (ADC A / D converter) into a binary string that can then be tracked with suitably modulated carrier and the receiving end reconstructed without information loss.

Please stand by for the next part of the article.

Please do leave comments.

Telemetry

Telemetry (= remote sensing) is the transmission of measured values at a monitoring site located probe ( sensor ) to a remote location. At this place of receipt, the measured values are available only collected and recorded or evaluated immediately.

Telemetry is often accompanied by a pathway for detecting sensor, so as to respond to readings delivered with appropriate measures. This return path is called a remote control (Telekommandierung, Tele-Command).

Pure telemetry

A telemetry that transfers the data over long distances is called the far field telemetry. This is for example the
collection of weather data, technical data from a moving vehicle ( aircraft, space vehicles, racing cars), the tracking of migratory animals such as lynx and Honey Buzzard , in the transmission of decentralized traffic information or in the transmission of medical data inserted probes, where the outside world. is not felt.

Telemetry called applications in which data is transmitted over short distances by moving machine parts on a stationary receiver. For example, state data of gas turbine rotors and tire pressures of rotating vehicle wheels are provided.

Often the data to spatially widely separated locations are recorded and measured by telemetry to a central office sent there to be recorded and / or evaluated.