# US 11,029,284 B2 · Acoustic resonance chamber > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,029,284 B2 - Document ID: US11029284B2 - Status: Granted - Kind: B2 - Application number: 16/270,447 - Filed: 2019-02-07 - Published: 2019-11-07 - Granted: 2021-06-08 - Earliest claimed: 2018-02-08 - Assignees: South Dakota Board of Regents - Applicants: South Dakota Board of Regents - Inventors: Lowell Kolb; Charles Tolle; Nathan Williams; Jason Ash - Web page: https://patentgrep.com/patent/US11029284B2 ## CPC - G01N 29/036: by measuring frequency or resonance of acoustic waves - G01N 29/024: by measuring propagation velocity or propagation time of acoustic waves - G01N 29/222: {Constructional or flow details for analysing fluids (optoacoustic fluid cells G01N29/2425)} - G01N 29/2437: {Piezoelectric probes} - G01N 2291/011: Velocity or travel time - G01N 2291/014: Resonance or resonant frequency - G01N 2291/021: Gases - G01N 2291/02881: Temperature - G01N 2291/102: one emitter, one receiver - G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q) ## Abstract A system for determining gas characteristics at high altitudes in embodiments of the present invention may have one or more of the following features: (a) a high-altitude balloon having one or more of the following features: (a) a balloon, (b) a balloonsat operably coupled to the balloon, (c) an air path chamber wherein gas at a high altitude can occupy the air path chamber, (d) a first speaker located on a substrate within the air path chamber, wherein the first speaker takes an electrical signal input and creates a first sound wave, and (e) a second speaker located on the substrate facing opposite of the first speaker located outside of the air path chamber, wherein the second speaker takes the electrical signal and creates a second sound wave. ## Claims ### Claim 1 A system for determining gas characteristics at high altitudes, comprising: a high-altitude balloon; comprising: a balloon; a balloonsat operably coupled to the balloon; an air path chamber wherein gas at a high altitude can occupy the air path chamber; a first speaker located on a substrate within the air path chamber, wherein the first speaker takes an electrical signal input and creates a first sound wave; a second speaker located on the substrate facing opposite of the first speaker located outside of the air path chamber, wherein the second speaker takes the electrical signal input and creates a second sound wave; a vibration sensor coupled to the substrate capable of measuring vibrations conducted by the substrate, wherein the vibration is the difference between the first and the second sound wave; a feedback control system electrically coupled to the air path chamber, wherein the feedback control system sends an output of the vibration sensor to an electrical detection and control circuit which subtracts the output of the vibration sensor from the electrical signal input originally driving the first and the second speakers, wherein the difference between the electrical signal input and the vibration sensor is sent to the second speaker to create a third sound wave, the vibration sensor then detects a difference between the first sound wave and the third sound wave to minimize vibrations being conducted into the air path chamber; and a microphone located within the air path chamber opposite the first speaker. ### Claim 2 (depends on 1) The system of claim 1, further comprising: a silicone foam block and end cap coupled to the microphone to prevent conducted vibrations traveling through the substrate from reaching the microphone. ### Claim 3 (depends on 1) The system of claim 1, further comprising: a silicone coupler located midway between the first speaker and the microphone to isolate the microphone from vibrations traveling through the substrate. ### Claim 4 (depends on 3) The system of claim 3, wherein a vibration cancelation iterative process is repeated where the vibration sensor continually sends the output of the vibration sensor to the electrical detection and control circuit, which subtracts this signal from the electrical signal input, which then drives the second speaker, which creates a vibration sensed by the vibration sensor, which then sends the output of the vibration sensor detected back to the electrical detection and control circuit. ### Claim 5 (depends on 4) The system of claim 4, further comprising: a first piezo driver amplifying the electrical signal input to the first speaker and a second piezo driver amplifying the signal from the electrical detection and control circuit to the second speaker. ### Claim 6 A system for determining gas characteristics at high altitudes, comprising: a balloon having a balloonsat and an air path chamber operably disposed on the balloon, wherein gas at a high altitude can occupy the air path chamber; a first speaker disposed within the air path chamber, wherein the first speaker receives an electrical signal input and creates a first sound wave; a second speaker disposed opposite the first speaker outside of the air path chamber, wherein the second speaker receives the electrical signal input and creates a second sound wave; a vibration sensor operably configured for measuring a vibration difference between the first and the second sound wave; an electrical detection and control circuit configured to compute a difference between the electrical signal input and an output of the vibration sensor; a third sound wave created by the second speaker using the difference between the electrical signal input and an output of the vibration sensor; a difference between the first sound wave and the third sound wave detected by the vibration sensor and configured to minimize vibrations being conducted into the air path chamber; and a microphone located within the air path chamber opposite the first speaker. ### Claim 7 (depends on 6) The system of claim 6, further comprising: a substrate operably disposed for conducting vibrations. ### Claim 8 (depends on 6) The system of claim 6, further comprising: a substrate with the first speaker operably disposed within the air chamber. ### Claim 9 (depends on 6) The system of claim 6, further comprising: a substrate with the first speaker operably disposed within the air chamber and the second speaker operably disposed on the substrate facing opposite the first speaker. ### Claim 10 (depends on 6) The system of claim 6, further comprising: a substrate with the vibration sensor operably coupled to measure the vibration conducted by the substrate. ### Claim 11 (depends on 6) The system of claim 6, further comprising: a silicone foam block and end cap coupled to the microphone to prevent conducted vibrations traveling through a substrate from reaching the microphone. ### Claim 12 (depends on 6) The system of claim 6, further comprising: a silicone coupler located midway between the first speaker and the microphone to isolate the microphone from vibrations traveling through a substrate. ### Claim 13 (depends on 6) The system of claim 6, further comprising: a vibration cancelation iterative process made operable by the electrical detection and control circuit, wherein the vibration cancelation iterative process is repeated wherein the vibration sensor continually sends the output of the vibration sensor to the electrical detection and control circuit, which subtracts this signal from the electrical signal input, which then drives the second speaker, which creates a vibration sensed by the vibration sensor, which then sends the output of the vibration sensor detected back to the electrical detection and control circuit. ### Claim 14 (depends on 6) The system of claim 6, further comprising: a first piezo driver amplifying the electrical signal to the first speaker and a second piezo driver amplifying the signal from the electrical detection and control circuit to the second speaker. ### Claim 15 (depends on 6) The system of claim 6, wherein high altitudes comprise altitudes at or above 70,000 feet. ### Claim 16 A system for determining gas characteristics at high altitudes, comprising: a balloon having a balloonsat and an air path chamber operably disposed on the balloon, wherein gas at a high altitude can occupy the air path chamber; first and second speakers operably connected to receive an electrical signal input and create respective first and second sound waves; a vibration sensor operably configured for measuring a vibration difference between the first and second sound waves; an electrical detection and control circuit configured to compute a difference between the electrical signal input and an output of the vibration sensor; a third sound wave created by the second speaker using the difference between the electrical signal input and an output of the vibration sensor; and a difference between the first sound wave and the third sound wave detected by the vibration sensor and configured to minimize vibrations being conducted into the air path chamber. ### Claim 17 (depends on 16) The system of claim 16, further comprising: a microphone operably disposed within the air path chamber opposite the first speaker. ### Claim 18 (depends on 16) The system of claim 16, further comprising: a substrate with the first speaker operably disposed within the air chamber for conducting vibrations. ### Claim 19 (depends on 16) The system of claim 16, further comprising: a substrate with the first speaker operably disposed within the air chamber and the second speaker operably disposed on the substrate facing opposite the first speaker. ### Claim 20 (depends on 16) The system of claim 16, further comprising: a substrate with the vibration sensor operably coupled to measure the vibration conducted by the substrate.