ESPI Electronic speckle pattern interferometer/title> <meta name="description" content="The 3D Laser ESPI System (laser holography) measures in and out-of-plane displacements and strain very precisely using laser interferometry"> <meta name="keywords" content="Trilion, 3D, deformation, ESPI, speckle pattern interferometer, CCD, camera, laser holography, displacements, resolution, micron, micrometer, FEA, materials"> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <script language="JavaScript" type="text/JavaScript">  </script>  <style>  </style> <script language="JavaScript" type="text/JavaScript">  </script> <link href="../trilion_style.css" rel="stylesheet" type="text/css"> </head> <body> <table width="850" border="0" cellspacing="0" cellpadding="0">  <tr> <td height="32" colspan="3" class="H1">ESPI speckle pattern interferometer <div align="right"></div></td> <td height="32" class="TopLineText"> </td> <td width="178" rowspan="2"> <div align="right"><a href="../index.html"><img src="../images/logo-trilion2.jpg" alt="Trilion experts in image correlation, photogrammetry, 3D coordinate measuring" width="120" height="90" border="0"></a></div> </td> </tr> <tr> <td height="58" colspan="3" class="H2">Digital laser holography for deformation measurement with sub-micron resolution</td> <td> </td> </tr> <tr> <td height="36" colspan="5" class="SecondLine"> <p><a href="index.html">3D Measurement Products </a> | <a href="../Applications/index.html">Applications</a> | <a href="../Services.html">Services</a> | <a href="../Company/index.html">Company</a> | <a href="../Contact.html">Contact</a> | <a href="../Company/news-events.htm">News</a></p></td> </tr> <tr> <td height="19" colspan="2"> </td> <td width="487"> </td> <td colspan="2"> </td> </tr> <tr> <td height="365" colspan="2" class="LeftBar">  <p class="LeftBarActive">ESPI Home</p> <p><a href="#" onClick="MM_openBrWindow('../pdf/Lit.ESPI.pdf','','toolbar=yes,location=yes,status=yes')">Product Brochure</a> </p> <p><a href="../white-papers.html">White Papers</a></p> <p><a href="../Applications/index.html#ESPI">Applications</a></p> <p><a href="#ESPIcontact">Contact Trilion for more information</a></p>  <p> </p></td> <td colspan="3" valign="top" class="BodySEL">  <p><img src="images/espi-200.jpg" alt="ESPI laser holography uses speckle pattern interferometry" width="200" height="117" align="right">ESPI = <em>Electronic Speckle Pattern Interferometry</em></p> <p>The 3D Laser ESPI System (laser holography) measures in and out-of-plane displacements and strain very precisely using laser <a href="http://en.wikipedia.org/wiki/Interferometer">interferometry</a>. It is used in a broad variety of applications from fatigue tests to general strain measurement and analysis. The interferometric method ESPI is well suited to measure the smallest 3D displacements and plane strain with resolutions of approximately 10 nanometers or 1 micrometer per meter.</p> <p>The ESPI system includes a high quality digital CCD camera with computer-controlled shutter time, one or multiple laser sources, a computer controlled phase shift device, the needed optic and the needed electronic driver and the data acquisition and treatment system, integrated in the PC.<br> The laser light is directed onto the object under test and the camera grabs the resulting speckled image. Object deformations in the sub-micrometers range modify the image gathered by the CCD camera. Using appropriate image treatment, the difference between the two images shows up with black interference fringes (real time viewing of the actual deformation).</p> <p><strong>Common uses include: </strong></p> <blockquote> <p class="BodySELLine">- Deflection, strain, thermal expansion and residual stress measurements<br> - FEA validation<br> - Determining the linear behavior, even of brittle materials<br> - Characterizing heterogeneous materials<br> - Characterizing the transition range of two different materials<br> - Quality control of honeycomb and sandwich structures<br> </p> </blockquote> <p class="BodySectionTitle" id="ARGUScontact" name="ARGUScontact"><a name="ESPIcontact" id="ESPIcontact"></a>Contact us for more information about ESPI:</p> <form name="ESPI" method="post" action="http://trilion.com/nvform.php"> <input type="hidden" name="subject" value="ESPI Inquiry"> <input type="hidden" name="success_page" value="http://www.trilion.com/Products/ESPI-contact-success.html"> <input type="hidden" name="required" value="Name,Company,email,phone"> <table width="573" border="0" cellpadding="0" cellspacing="0"> <tr class="ContactTable"> <td width="93">Name*</td> <td width="198"> <input name="Name" type="text" id="Name"></td> <td width="86">Title </td> <td width="196"> <input name="Title" type="text" id="Title"></td> </tr> <tr class="ContactTable"> <td>Company*</td> <td> <input name="Company" type="text" id="Company"></td> <td>Address </td> <td> <input name="Address" type="text" id="Address2"></td> </tr> <tr class="ContactTable"> <td>e-mail*</td> <td> <input name="email" type="text" id="email"></td> <td>phone*</td> <td> <input name="phone" type="text" id="phone"></td> </tr> <tr class="ContactTable"> <td>Inquiry description </td> <td colspan="3"> <textarea name="inquiry" id="inquiry"></textarea></td> </tr> <tr class="ContactTable"> <td> </td> <td><font size="-2">* required field</font></td> <td> </td> <td><input type="submit" name="Submit" value="Submit request for ESPI info"></td> </tr> </table> </form>  </td> </tr> <tr> <td height="29" colspan="2" class="Contact"> <div align="center"><a href="../Contact.html"><img src="../images/trilion_triangle_15H.gif" alt="Trilion contacts for high-speed material testing" width="19" height="17" border="0" align="absmiddle"> </a><a href="../Contact.html">Contact Us</a> </div></td> <td> </td> <td colspan="2"> </td> </tr> <tr> <td width="103" height="19"> </td> <td width="63"> </td> <td colspan="3" class="LastLine">ESPI Digital laser holography for deformation measurement with sub-micron resolution </td> </tr> <tr> <td height="19" colspan="2"> </td> <td colspan="3"><link href="../trilion_style.css" rel="stylesheet" type="text/css"> <p align="center" class="SecondLine">© 2007 Trilion Quality Systems - West Cohshohocken, PA <img src="../images/icon-phone2.jpg" alt="contact us for forming analysis services" width="15" height="11" align="absmiddle"> 610-722-5100</p> </td> </tr> <tr> <td height="1"></td> <td></td> <td></td> <td width="19"></td> <td></td> </tr> </table> </body> </html>