{"id":149,"date":"2012-04-25T01:42:50","date_gmt":"2012-04-25T01:42:50","guid":{"rendered":"http:\/\/nf3v.com\/wp\/?page_id=149"},"modified":"2012-06-27T01:57:39","modified_gmt":"2012-06-27T01:57:39","slug":"as-1-seismometer","status":"publish","type":"page","link":"http:\/\/nf3v.com\/wp\/?page_id=149","title":{"rendered":"AS-1 Seismometer"},"content":{"rendered":"

As a second seismometer, I chose to build a vertical seismometer.\u00a0 One of the simplest designs is that of the AS-1 vertical seismometer as sold by\u00a0<\/span>The\u00a0Amateur<\/span>\u00a0Seismologist<\/span><\/a>.<\/span><\/p>\n

I copied the design of\u00a0Dewayne Hill’s Homebrew Vertical<\/a>\u00a0<\/span>and the metal parts were ordered Online Metals and I think that the total price of the seismometer came to ~$100 (not including the electronics)<\/p>\n

Here are some pictures.<\/p>\n

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This is a general overview.\u00a0 The components are exactly as found in Dewayne Hill’s page.\u00a0 The yellow magnet was purchased at Sears Hardware.<\/div>\n
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The angles are not offset as in Dewayne’s design, just the bolts.\u00a0 This did require the drilling of two additional holes.\u00a0 The baseplate is 1\/4″ aluminum.\u00a0 The leveling screws holes are tapped.<\/div>\n
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The razor blade is a standard one with the tab end pulled off (use pliers and a vise…safety above all else!!)<\/div>\n
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The damping system is as described by Chris Chapman and uses 4 high-strength magnets and a copper vane.<\/div>\n
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As an aside, I really think that one of the\u00a0coolest<\/em>\u00a0things in the world is the eddy effect that aluminum and copper display when in the presence of a magnetic field.\u00a0 I had a long aluminum strip that I slid down through the interspace of the magnets, and it just was like it was flowing through molasses.<\/p>\n

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Please note, if you duplicate the above, make sure that you measure the vane size TWICE.\u00a0 I ordered it pre-cut and neglected to include the top tab.<\/p>\n

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The sensing coil was purchased from Larry Cochrane for $20 and has a 6′ RCA cable soldered to it.<\/p>\n

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The Lowe’s around me has a ready supply of the springs.\u00a0 Some have said that it needs to be cut.\u00a0 In actuality, I left mine full size and just added some weight at the end.<\/p>\n

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(Update – 2012) – The AS-1 is now offline. \u00a0Like my Lehman design, I will be donating it to a local college so that future geologists may benefit to some small degree from my work.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

As a second seismometer, I chose to build a vertical seismometer.\u00a0 One of the simplest designs is that of the AS-1 vertical seismometer as sold by\u00a0The\u00a0Amateur\u00a0Seismologist. I copied the design of\u00a0Dewayne Hill’s Homebrew Vertical\u00a0and the metal parts were ordered Online … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":[],"_links":{"self":[{"href":"http:\/\/nf3v.com\/wp\/index.php?rest_route=\/wp\/v2\/pages\/149"}],"collection":[{"href":"http:\/\/nf3v.com\/wp\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"http:\/\/nf3v.com\/wp\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"http:\/\/nf3v.com\/wp\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/nf3v.com\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=149"}],"version-history":[{"count":9,"href":"http:\/\/nf3v.com\/wp\/index.php?rest_route=\/wp\/v2\/pages\/149\/revisions"}],"predecessor-version":[{"id":254,"href":"http:\/\/nf3v.com\/wp\/index.php?rest_route=\/wp\/v2\/pages\/149\/revisions\/254"}],"wp:attachment":[{"href":"http:\/\/nf3v.com\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=149"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}