最近几年，由于频谱激电在油气勘探、金属矿勘探和环境地球物理方面的潜在应用，频谱激电研究又火起来了。作为一直从事频谱激电研究的老兵，应法国科学院Revil教授请求对我在频谱激电方面的工作做了介绍。下面是2016年年初给Revil教授回信的主要内容：

It’s my great pleasure to hear from you. I hope you have a great year in 2016. The year 2016 belongs to monkey year according to Chinese culture. Kind people in monkey year will be very smart and clever. Anyway, I summary my contribution to IP research.

I developed method and instrument for SIP research and application. I put forward relative phase spectrum measurement method in SIP about 10 year ago. The relative phase spectrum measurement can remove EM coupling, capacitive coupling, and synchronization error in phase measurement of SIP. The relative phase spectrum measurement is the key for the successful application of SIP in the field.

Then I developed a distributed SIP acquisition system with 800 channels based on ZigBee sensor network and GPS four years ago. It’s the biggest SIP system in the world to my knowledge. I used this SIP system in China for a lot of projects and it is very successful in mineral exploration. I also developed a SIP system for laboratory usage. This system can measure accurate SIP response of rock and ore sample with ultra-low impedance and ultra- high impedance. The highest impedance of sample can be great than 10 G ohm. Therefore, it can make SIP response of sample with very few water content.

Now I am developing a SIP system based on wired network. This system is much cheap than the SIP system based on wireless communication targeted for mineral exploration in mountain area. The wired SIP system adopt the basic idea of cabled seismic acquisition. It reduce capacitive coupling that exist in current SIP system for engineering usage. The wired SIP system designed by me and my team achieved ultra- high synchronization accuracy which is vital important for signal to noise enhancement.

The systems developed by me adopt ultra-low noise electrical element and state-of-art signal processing method. We can acquire good quality SIP data in area with strong noise or interference.

今年，我们将在频谱激电方面加大勘探力度和基础研究投入，使频谱激电成为矿业勘探的高效物探手段。我们有大量高质量勘探数据和岩矿石标本频谱激电数据，目前正和国外的多个团队开展合作。期待国内的同行也加入，大家共同推进频谱激电的发展。