Using DSP to design spectralog service instrument

The paper presents a spectralog service instrument based on DSP processor. The instrument collects spectrum information from the well thousands of meters underground. The instrument consists of the lower computer and the communication device. The communication between the upper computer on the ground and lower computer in a well uses the Manchester code. The upper computer not only displays spectrum information on the computer, but also achieves to control the lower computer. The upper computer sends the command by a Manchester encode, the lower computer decodes the Manchester code and fulfill different tasks, including the collection and transmission of natural gamma ray spectralog, the collection and transmission of temperature information, the frequency of natural gamma ray radiation energy, etc. The spectralog service instrument is experimentally proved to be steady, reliable and effective.