The GSM-19 high-precision Overhauser magnetometer 

 Overhauer magnetometer is a unique technology for the use of GEM companies developed high-precision magnetometer, it has a series of unique advantages for high-precision magnetometer observations. 

 A. Applications 
 It is mainly used in: 
 ● High precision mineral resource exploration 
 ● basin structure of the oil, gas exploration 
 ● Engineering and environmental exploration 
 ● underground objects buried pipe and cable detection 
 ● earthquakes and volcanic precursor observation 
 ● archaeological 
 ● material magnetic precision measurements 
 Two. Working principle 
 When the special containing unpaired electron liquid hydrogen atoms combine, and the polarization of the radio frequency (RF) magnetic field will produce the Overhauser effect. That the unpaired electron of its own polarization transfer to the hydrogen atoms, produced a strong precession signal precession signal with high sensitivity to the total magnetic field strength values, and can be a simple equation expression. So by measuring the precession signal can be measured by the total magnetic field strength. Such magnetometer the called Overhause magnetometer. As the generator frequency (RF) magnetic field the energy required is very small, and the band in the frequency of the precession signal, thus eliminating the measurement noise, so Overhauser magnetometer particularly low power consumption, high precision. In addition, the RF magnetization process and the measurement of the precession signal synchronization, high observing efficiency, high-speed sampling. 
 3. Overhauser magnetic probes 
 Overhauser magnetometer probe is the patentability of innovative products, it is the best combination of electronics design and quantum magnetic chemistry. In electronics, the probe contains a reverse series of pairs of pick up coil to suppress the environmental noise, such as atmospheric noise. Filling in the quantum of magnetic chemical probe belonging to the company's patented solution of the free-electron hydrogen-rich liquid, thus increasing the signal strength in the magnetic field of the RF polarization precession. Material aspects of the probe size is very small, very light and firmly. Probe materials are carefully selected non-magnetic material, in order to improve the signal to noise ratio. Probe directionality is very small, and can accurately measure the magnetic field near the equator do not have to pay attention to the direction of the probe is placed in the field of measurement. 
 4. Overhauser magnetometer instrument host 
 The host, including a miniature keyboard, built-in curing pieces of display interface, the system control circuit and data storage and data retrieval. For ease of operation, the display monochrome text and real-time profiles show a dual function, and can be used interchangeably. By GEMLinkw software website upgrade the built-in software in the curing, so can make your magnetometer will always maintain the highest level, without having to return to the factory upgrade. 
 Figure Overhauser magnetometer probe and host 

 5 Overhauser magnetometer main advantage of 
 Overhauser magnetometer high-precision data acquisition efficiency and high stability combined. The accuracy of its observations and expensive cesium optical pumping, but has unique advantages in stability and power consumption: 
 ● High sensitivity, high resolution and high observation accuracy 
 ● super full range of sensors 
 ● before the measurement without warm-up, easy to field operations 
 ● Data storage up to 4M bytes can be expanded to 32M bytes 
 ● Programmable basis points to stand 
 ● fast data transfer 
 ● placed within the magnetometer, integrated GPS for positioning measurement (optional), a resolution of up to 5 m or 1 m 
 ● a wide temperature range from -40 to +55 degrees Celsius (standard; a selection from -55 to 60 degrees Celsius), can be used in extreme climatic conditions 
 ● Rugged and reliable design. Long life, adaptable 
 ● almost no maintenance, ensuring lower cost of use 
 ● Other advantages of the updated software from the site include: high absolute accuracy, operating speed (up to 5 readings per second), very low energy consumption 
 6. Overhauser magnetometer technology indicators and configuration 
 Technical indicators: 
 ● Sensitivity: 10000nT / m 
 ● Sampling rate: 60 + 5,3,2,1,0.5,0.2 seconds 
 ● temperature drift: 0.0025nT / ℃ (ambient temperature of 0 to -40 ° C); 0.0018nT / ° C (ambient temperature 0 to +55 ° C) 
 ● Operating temperature: -40 ℃ - +55 ℃ 
 ● Memory 4M bytes, which means: 209,715 readings basis points station 699,050 readings gradiometry 174,762 readings Walking Map mode 299,593 readings on the mobile observation 
 ● Size and weight: Host 223 × 69 × 240mm, weight 2.1Kg probe 175mm (length) × 75mm (diameter) and weighs 1.0Kg 
 Operating modes: station: every 3 seconds, automatically read and store the time observed value, the measuring point coordinate values, as well as time and date. Basis points stand: every 3-60 seconds storage time observed value, time and date of remote control: selectable RS232 interface for remote measurement 
 ● Input and Output: RS232 interface digital output or 6-pin waterproof plug (option) for analog output standard configuration GSM-19 host, GEMLinkW Software, internal rechargeable battery, charger, probe and cable, and probe pole, RS232 cable transport box, the Chinese operating manual. Warranty period of two years, life-long service. 
 7. Precision Overhauser magnetometer series 
 ● GSM-19 Overhauser Standard magnetic device, the fastest reading 3 seconds 
 ● the GSM-19V Overhauser standard magnetometer + VLF 
 ● the GSM-19G Overhauser standard magnetic gradiometer (the fastest reading 3 seconds) 
 ● GSM-19GV the Overhauser standard gradiometer + VLF 
 ● the GSM-19W Overhauser Walking Magnetometer (fastest reading 0.2 seconds) 
 ● the GSM-19WV Overhauser Walking Magnetometer + VLF 
 ● the GSM-19GW Overhauser the Walking magnetic gradiometer (the fastest reading 2 seconds) 
 ● the GSM-19GWV Overhauser the Walking magnetic gradiometer + VLF 
 ● GSM-19GW4 Overhauser probes Overhauser Walking magnetic gradiometer 
 Warranty ● two years, life-long service. 

 China - Beijing land Sennheiser Technology Co., Ltd.