Advanced Study Of The Key Technology Of The Moon-Quake Prober

China plan to send a lander to Moon in 2012. And the moon-prober must be littleweight, small, anti-shock, low-power due to no man in the moon-detector and the tasksof science study of the lander are many. The mechanical structure of the Moon-proberand the Mars-prober made by America, Japanese and Europe is complex, and so of generalseismometer. Recently following the development of the MEMS technology, theresolution of the accelerometer based on the MEMS technlolgy is quite highperformance, and its sensitivity, noise and other performance have been approachedto the level of the traditional mechanical sensor, while they are largly better inthe performance of frequency response, power, weight, size, anti-shock, stability, etc.In the paper, try to use the MEMS accelerometer with high resolution and designedrational analog adjust circuit, get the signal output which ratio to the value ofthe quake velocity. Making an initial research for the development of the moon-quakeprober, and solve some problems of technology.Using 24 bitsΔ-∑analog digital converter/filter chipset CS5371/72/76 fordata acquisition, the chipset is used for high dynamic range explore in thegeophysics, and it shows a quite better performance among 24 bits analog-digitalconvert chips. Theer are three channels which used for the velocity signalconvert, while the other three channels are used for the direct current signal ofacceleration convert, which is averaged to get the noise and the low frequency signalin the moon wave away for be used to calculate the inclination of the moon-quakeprober.There are two transmission methods which one is wire and another is wireless.To guarantee the data is correctness in transmission, the protocol use the packedframe form, this can reduce the error codes and wrong codes efficiently.Because of the strict restriction to the prober's volume, weight, power consumeetc, it's hard to use the method of horizontal adjust by use the mechanical equipment.Using coordinate change method instead of mechanical horizontal adjustequipment, getting the posture of the prober, and get the moon quake wave resultobserved by horizontal coordinate system by the result observed by inclinationcoordinate system, and the horizontal project direction of the Y axis(X axis) of theinclination coordinate system and horizontal coordinate system is the same, it's easy to make the directed exchange of moon-quake come true by the same way.Designed the moon-quake monitor software for receiving data, explaining theprotocol, making the functions of the simultaneous wave appearance and data storagecome true. To get better wave watching effect, wave appearance Use left movingcontinued appearance method instead of discontinued separate-screen appearancemethod. Discard the static vertical coordinate graduations (vertical coordinategraduations are fixed, to get a better appearance effect need the artificialadjustment of wave range's magnification and reduction. So the wave with narrowrange signal is hard to observe, and when the signal range is wide, it can't appearthe complete wave, it cause the distortion of the wave appearance.), at any time,vertical coordinate gradUations can adjust, dynamically to adapt the wave range'smaximum and minimum value showed by the current wave appearance window, make thecurrent wave can be showed completely in the show window. Vertical coordinategraduations give the range besides the maximum, minimum and average value, so it'seasy to make record when do the tests. Monitor software can make the appearance ofthe wave with wide time range come true, the design of the software make it'spossible to choose the wave appearance from 1 second to 30 minutes with high samplerate. And the software has good inter-operated interface, for the development, ofmoon quake prober later.The results shows that using the MEMS accelerometer can meet the requirementof little weight, low power consume, little volume, anti-shock, etc,.Theexperimental circuit can acheive: (1)the frequency response curve is flat in therange from 100 seconds to 50 HZ(low frequency is limited by the instrument); (2)the maximum noise range is 18.28 microvolt, and the dynamic range is wider than 110dB(in the condition of lab work and without shield test);(3) the power consume isless than 0.8W;(4) the weight is 65g(without the aerial set), the volume is 51mm×45mm×27mm.Now the MEMS accelerometer's resolution is 10⁷～10^-6g quantity class, thoughthere is a distance to the requirement of surveying earthquake wave which is 10^-8g,as the technologies developping, the problem must be solved.