Two People Working with a Water Tunnel Apparatus (Updated last month)

Information

• Identifier: TP-ATA-1926
• Date: Nov 1971
• Context: <p><strong>Water Tunnel Apparatus</strong></p> <ul> <li>The <strong>clear cylindrical tank</strong> is a <strong>water tunnel</strong>, the hydrodynamic equivalent of a wind tunnel.</li> <li>Inside, there appears to be a <strong>model or probe</strong> mounted on a rod, possibly for studying flow characteristics around submerged shapes (e.g., an airfoil, cylinder, or sensor).</li> <li>Water would flow through the test section, allowing visual or sensor-based investigation of flow behavior like turbulence, vortices, or pressure differences.</li> </ul> <p><strong>Control &amp; Measurement Rack</strong></p> <p style="padding-left: 30px;">The two units next to the water tunnel likely form a <strong>modular instrumentation system</strong>, which can be considered part of a <strong>single data acquisition and signal conditioning system</strong>&mdash;but composed of separate functional modules.</p> <ul> <li><strong>Left </strong>Unit (closer to the tank):<br /> This appears to be the main control and data interface panel. It includes:</li> <ul> <li>Signal conditioning dials</li> <li>Amplifiers and gain selectors</li> <li>Switches and controls for operating the test sequence</li> <li>Patch points for routing signals to the downstream recorder</li> </ul> <li><strong>Right Unit </strong>(stacked slightly behind):<br /> This houses additional modules like:</li> <ul> <li>Power supplies</li> <li>Frequency filters</li> <li>Possibly an oscilloscope module or analog output drivers</li> <li>Signal connectors tied to transducers or sensors in the water tunnel</li> <li>The rack-mounted format allowed researchers to customize and expand their setup based on what they were testing&mdash;pressure, flow velocity, turbulence, etc.</li> </ul> </ul> <p><strong>Why this modular design was used:</strong></p> <ul> <li>It allowed <strong>precise calibration</strong> for individual sensors.</li> <li>Gave the freedom to insert different signal conditioners depending on the experiment.</li> <li>Provided redundancy in case one component failed (they could simply swap modules).</li> </ul> <p>&nbsp;</p> <p style="caret-color: #000000; color: #000000; font-family: Verdana, Arial, Helvetica, sans-serif; font-size: 11px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: #ffffff; text-decoration: none;"><strong>Credits:</strong>&nbsp;</p> <p style="caret-color: #000000; color: #000000; font-family: Verdana, Arial, Helvetica, sans-serif; font-size: 11px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: #ffffff; text-decoration: none;">Some technical descriptions and historical interpretations were developed with the assistance of ChatGPT, an AI language model by OpenAI.</p> <p>&nbsp;</p>
• Geographic Coverage: San Francisco, CA
• Temporal Coverage: 1970s
• Type: Still Image
• Format: Negative
• Source: San Francisco State University Archives
• Rights: Public