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Title: Tag and seal employing a micromachine artifact


A tamper resistant seal including a population of particles embedded in an adhesive, the population including at least one micromachine artifact of a predetermined physical shape.

Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
OSTI Identifier:
Patent Number(s):
Application Number:
Sandia Corporation SNL-A
DOE Contract Number:
Resource Type:
Resource Relation:
Patent File Date: 2011 May 24
Country of Publication:
United States

Citation Formats

Merkle, Peter B. Tag and seal employing a micromachine artifact. United States: N. p., 2017. Web.
Merkle, Peter B. Tag and seal employing a micromachine artifact. United States.
Merkle, Peter B. Tue . "Tag and seal employing a micromachine artifact". United States. doi:.
title = {Tag and seal employing a micromachine artifact},
author = {Merkle, Peter B.},
abstractNote = {A tamper resistant seal including a population of particles embedded in an adhesive, the population including at least one micromachine artifact of a predetermined physical shape.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue May 16 00:00:00 EDT 2017},
month = {Tue May 16 00:00:00 EDT 2017}


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  • One or more magnets are placed in a container (preferably on objects inside the container) and the magnetic field strength and vector direction are measured with a magnetometer from at least one location near the container to provide the container with a magnetic vector field tag and seal. The location(s) of the magnetometer relative to the container are also noted. If the position of any magnet inside the container changes, then the measured vector fields at the these locations also change, indicating that the tag has been removed, the seal has broken, and therefore that the container and objects insidemore » may have been tampered with. A hollow wheel with magnets inside may also provide a similar magnetic vector field tag and seal. As the wheel turns, the magnets tumble randomly inside, removing the tag and breaking the seal.« less
  • A secure passive RFID tag system comprises at least one base station and at least one passive RFID tag. The tag includes a fiber optic cable with the cable ends sealed within the tag and the middle portion forming an external loop. The loop may be secured to at least portions of an object. The tag transmits and receives an optical signal through the fiber optic cable, and the cable is configured to be damaged or broken in response to removal or tampering attempts, wherein the optical signal is significantly altered if the cable is damaged or broken. The tagmore » transmits the optical signal in response to receiving a radio signal from the base station and compares the transmitted optical signal to the received optical signal. If the transmitted optical signal and the received optical signal are identical, the tag transmits an affirmative radio signal to the base station.« less
  • Methods and apparatus for positive displacement bonding and, more particularly, for automatically forming, on a continuous, reproducible basis, fusion bonds devoid of structural, electrical, and cosmetic defects between two or more workpieces are described. By moving a heated electrode into the area to be bonded so as to heat and melt uniformly the portions of the workpieces to be bonded while, at the same time, displacing substantially all of the molten material from the area to be bonded into a storage area or reservoir surrounding the heated electrode where such molten material is maintained in its uniformly heated molten state,more » and then retracting the electrode so as to permit the molten material to return to the cavity formed by the electrode in the workpieces where such molten material is allowed to cool and solidify, a flawless bond between the workpieces is formed. Improved sealing means are also used. Thermal or fusion bonds are made in accordance with the methods of the invention and with the apparatus of the invention by a combination of elevated temperature levels sufficient to melt the material to be bonded and displacement of the molten material, as contrasted with more conventional techniques and/or apparatus, which combine elevated temperature levels and pressure. 17 figures (auth)« less
  • A method for fusing together, using diffusion bonding, micromachine subassemblies which are separately fabricated is described. A first and second micromachine subassembly are fabricated on a first and second substrate, respectively. The substrates are positioned so that the upper surfaces of the two micromachine subassemblies face each other and are aligned so that the desired assembly results from their fusion. The upper surfaces are then brought into contact, and the assembly is subjected to conditions suited to the desired diffusion bonding.
  • A microelectromechanical (MEM) friction test apparatus is disclosed for determining static or dynamic friction in MEM devices. The friction test apparatus, formed by surface micromachining, is based on a friction pad supported at one end of a cantilevered beam, with the friction pad overlying a contact pad formed on the substrate. A first electrostatic actuator can be used to bring a lower surface of the friction pad into contact with an upper surface of the contact pad with a controlled and adjustable force of contact. A second electrostatic actuator can then be used to bend the cantilevered beam, thereby shorteningmore » its length and generating a relative motion between the two contacting surfaces. The displacement of the cantilevered beam can be measured optically and used to determine the static or dynamic friction, including frictional losses and the coefficient of friction between the surfaces. The test apparatus can also be used to assess the reliability of rubbing surfaces in MEM devices by producing and measuring wear of those surfaces. Finally, the friction test apparatus, which is small in size, can be used as an in situ process quality tool for improving the fabrication of MEM devices.« less