Doc 0000021820

e -- -------..--- ---· \ ... .,::..___ ...... --· ... ~...:._ _.;-.-~ ........ ... ---- / ·- ,:...._,......_ ·..:.. I .. . ~ •'- ... .· "\.. { ... .,. ,~ ~ ~-· a. February 1967 ---·--] Dear . .. . . . . ~ ~-. Enclosed is a short Prog_r-ess Report of our work to date pursuan-t -to--·----- ----------- ' ------· . ---.. -- . - -· - ... - '- . --... -- . '\ . ·._Yery truly yours. --- -- -------- ·~ \ l FOURTH PROGRESS REPOR'Z' . ... . ... s. February l967 ·."l Contract No. -.- . ~~ ·-- - ~· .~ - -- ~ -"~ = L&i. .. PROGRESS REPORT- 1 January to 31 January 1967 I. PIEZOELECTRIC CRYSTALS Several PZT 5-B sedes connected ceramic bimorphs have been obtained from Clevite. A test rig :vas built to illow electrical and mechanical measurements on these ceramic crystals. The test rig allows a thin rectangular' crystal to be mounted cantilever fashion; i.e •• clamped at one end with the rest of the element suspended in air. A stop was machined to allow the free iar end of the crystal to be de p::-essed only • 02_011 Fo;.:- the 1. 7" by. 7" crystal which has been • subjected to test this amount of deformation represents a strain of 4 about 2 x 10- which is 20o/o of the eXpec.ted rr"acture strain and sufficient . ~ . . to produce a peak' voltage transient ot 15 · -volts. The experimentation with . :. .. ~ this crystal has bt:.en concerned Wi~h establishing the transient or tinging characteristics. Electrical voltage ~utput is monitored on an oscilloscope. ·. and the crystal is set in (decaying) oscillation. by depressing the end to the step with a piece of plastic and then sliding the plastic off the end of .. :. the cr,stal. Oscillation at 150 cps occurs with an approximately expo- • ; ·; I' . • nential amplitude ~ecay at a ti~e constant of 8;) milliseconds (wi.th a 10 meg electrical load). This time constant can be interpreted as equivalent to uying that the system has a Q of 39 with all electrical open circuit. ~~s the resistance connected to crystal is decreased the Q is' lowered and the oscillation dies out faster. A lumped constant electromech:lnical model of the crystal was used to develop expressions for total system The provided image is not a declassified CIA document from the MKUltra collection. Instead, it is a watermark or informational graphic overlaid on a black background. The graphic features a stylized image of a vault door on the left side, with a bright blue and cyan glow. To the right, text proclaims "THE BLACK VAULT" in a bold, white, distressed font. Below this, white text explains that the document was obtained from "The Black Vault," an online database of declassified government documents, specifically mentioning the "MKULTRA/Mind Control Collection" compiled by the Central Intelligence Agency (CIA). A yellow hyperlink is displayed at the bottom. There are no photographs, handwritten annotations, official stamps, forms, diagrams, tables, redactions, or visual evidence of experimental procedures present in this image. The document is a typed letter dated February 8, 1967. It contains handwritten marginalia in the upper right corner, including what appears to be an initial and a checkmark. There is also a handwritten annotation in the lower left corner that reads "copy submitted 3/1/67". A circled number "270" is present in the bottom right corner, possibly a page number or document identifier. The document contains various small black dots, which may be print artifacts or part of the original document's condition. No images of people, locations, equipment, or subjects are present, nor are there any official stamps or redacted content. equivalent to uying that the system has a Q of 39 with all electrical open circuit. ~~s the resistance connected to crystal is decreased the Q is' lowered and the oscillation dies out faster. A lumped constant electromech:lnical model of the crystal was used to develop expressions for total system Q and total e-lectrical power delivered to the lo<:Ld resistor as functions of e~"ternnl load r-esist:lncc. The optimum resistance was thus calculated and when a resistor of this v3lue h connected to the test crystal, Q _and voltage de crcas3 to values within the experimental error ( ~ sor.,) of the calculated values. According to our calculations the ma~:imum efficiency or c.nergy .. con..-ersion is SO'r" with a pure resistive load of the optimum value and the quantity of power !or- a 20o/o strain is 20 p Joule per square inch c-f crystal area for each transient mechanical excitation. Since the actual load presented by an electronic package will not be a pure resistance the actual conversion efficiency will be less than SOo/o. Our previously as$umed value of 20o/'o efficiency still appears a reasonable one. In the remaintng contract time work will continue to establish the design requirements of a piezoelectric energy converter. n. E:\IG SOURCE RESISTANCE Our consultants have determiried ~.hat the most promising electrode materials al~e platinum, gold. stainles~~ ~tee1. and tantalum. 3 mU ..... . -· diameter wires of all four metals"-.have been ordered. The stainle. ss .. ·. steel and platinum {90o/" PT lOo/o IR). \~ires have been received already Teflon coated. When the other wires··arrive the~ will be Teflon co~ted by a local company. OUr animal experiment consultant is expected to . . begin work immediately using the materials on hand with laboratory rats as the experimen~al subjects. .. . This page is the first page of a document titled "FOURTH PROGRESS REPORT", dated "February 8, 1967". It also has "Contract No." printed, with a partial handwritten number following it. The document appears to be a standard report format, with no photographs, diagrams, or specific experimental details visible. There are no apparent stamps, and the content is predominantly blank space with the informational text. The document is a typed page from a report, with a horizontal line at the top and bottom. There are no photographs, stamps, handwritten notes, or forms present. The text is solely in a black, serif font, with a single instance of a circled bullet point near the top left margin. The content focuses on the scientific details of piezoelectric crystals, including their construction, testing procedures, and electrical characteristics. There is no visual evidence of experimental procedures, equipment, or facilities beyond what is described in the text. The document appears to be a typed page from a technical report, with a top margin that may have contained an official stamp or header, but is mostly out of frame. There are no photographs, handwritten annotations, or forms on this page. The text discusses the conversion efficiency of piezoelectric energy converters and potential electrode materials. There are no diagrams, schematics, tables, or visual evidence of experimental procedures or facilities presented on this particular page. The only visual elements are the body of the text and a page number "-2-" at the top of the text block.