Method and apparatus for identifying and quantifying simple and complex chemicals

• US 4,818,348 A
• Filed: 05/26/1987
• Issued: 04/04/1989
• Est. Priority Date: 05/26/1987
• Status: Expired due to Fees

• Current Assignee: TSI Incorporated
• Original Assignee: Transducer Research, Inc. (TSI Incorporated)
• Inventors: Stetter, Joseph R.
• Primary Examiner(s): NOT, DEFINED
• Application Number:
  US07/053,723
• Time in Patent Office: 679 Days
• Field of Search: 364/497, 204/406, 204/411, 204/412, 204/1 T, 422/98, 436/52, 436/149, 436/150, 338/34, 73/23, 324/439
• US Class Current: 205/780
• CPC Class Codes: G01N 2030/025 Gas chromatography
• CPC Class Codes: G01N 2030/027 Liquid chromatography
• CPC Class Codes: G01N 30/62 Detectors specially adapted therefor
• CPC Class Codes: G01N 33/0031 comprising two or more sensors, e.g. a sensor array
• CPC Class Codes: Y10T 436/117497 with a continuously flowing sample or carrier stream

Abstract

A portable instrument for use in the field in detecting, identifying, quantifying, and monitoring gas, liquid or solid materials is disclosed. The instrument may analyze either liquids or gases depending upon the type of sensor array therein. The instrument also includes means for changing a gas, liquid or solid to a fluid material. The instrument further includes an array or small sensors which, upon exposure to the unknown material, form a pattern of electrical responses, a source of previously formed response patterns characteristic of various materials, and microprocessor means for comparing the sensor-formed response pattern with one or more previously-formed response patterns to thereby identify the material on a display. The number of responses may be increased by changing the operating voltage, temperature or other condition associated with one or more sensors to provide a plurality of responses from each of one or more of the sensors. The instrument is capable of identifying a large number of liquid and solid materials.

Claims

1. A method for identifying and quantifying at least one component of liquids and solids comprising the steps of:

changing a non-fluid sample to a fluid material, introducing said fluid material to an array of sensors for exposure of said fluid material to said sensors, said array including plural sensors having differing electrical responses to said fluid material which are dependent on the interaction of said fluid material with each of said sensors and upon either an operational condition of at least one of said sensors or at least one property of the fluid material,

changing an operational condition of at least one of said sensors or at least one property of the fluid material to provide a plurality of different responses from at least one of said sensors,

forming a response pattern from the responses of said sensors, and

comparing the formed response pattern with a set of previously established response patterns to identify at least one component of the liquids and solids.

2. A method in accordance with claim 1 wherein said step of changing a non-fluid sample comprises the steps of:

providing a non-fluid sample to a chamber having a heating element means therein, and heating said non-fluid sample to change it to a gluid material

3. A method in acordance with claim 2 wherein a said step of introducing said fluid material to an array of sensors comprises the steps of:

fluidly connecting said chamber with said array, and

forcing said fluid material out of said chamber of said sensor array by introducing a fluid material into said chamber through a separate inlet.

4. A method for identifying and quantifying at least one component of gases and liquids comprising the steps of:

changing a gaseous sample to a liquid material,

introducing the liquid material to an array of sensors for exposure of the liquid material to said sensors,

said array including plural sensors having differing electrical responses to the liquid material which are dependent on the interaction of the liquid material with each of said sensors and either at least one property of the liquid material or and operational condition of at least one of said sensors

changing at least one property of the liquid material or an operational condition of at lest one of said sensors to provide a plurality of different responses from at least one of said sensors,

forming a response pattern from the response of said sensors, and

comparing the formed response pattern with a set of previously established response patterns to identify at least one component of the liquid or gaseous material.

5. A method in accordance with claim 4 wherein said step of changing a gaseous material to a liquid material comprises the steps of:

providing a gaseous sample having a condensing means therein, and

condensing said gaseous sample to change it to a liquid material

6. A method in accordance with claim 5 wherein said step of introducing the liquid material to an array of sensors comprises the steps of:

fluidly connecting said chamber with said array, and

forcing the liquid material out of said chamber to said sensor array by introducing a fluid material into said chamber through a separate inlet.

7. An instrument for identifying at least one component of gases, liquids and solids comprising,

means for changing solids to liquids or gases, or liquids to gases, said means including at least one heating element means for vaporizing liquids and solids, a block of heat resistant material having a chamber therein, a sample container to fit within said chamber along with said heating element, means such that said container is contacted with said heating element means, and means for sealing said chamber from the atmosphere;

sensing means including an array of sensors;

means for introducing the liquids or gases to said sensing means, said array including at least two sensors having different electrical responses to the liquids or gases dependent on the interaction of the liquids or gases with each of said sensors and upon an operational condition of at least one of said sensors,

means for changing an opertional condition of at least one of said sensors to provide a plurality of different responses from said at least one sensor,

means for forming a response pattern from said sensing means upon exposure to a liquid or gaseous sample,

means for providing a plurality of previously established response patterns, and

means for comparing the formed response pattern with at least one previously established response pattern to identify the component of the gases, liquids and solids.

8. An instrument in accordance with claim 7 wherein said means for changing solids to liquids or gases, or liquids to gases, further comprises:

a fluid inlet connected to said chamber at one end of said inlet, and a fluid outlet connected to said chamber at one end of said outlet and to said means for introducing liquids or gases to said sensing means at a second end of said outlet.

9. An instrument for identifying at least one component of gases, liquids and solids comprising:

means for changing solids to liquids or gases, or liquids to gases,

at least one condensing means for condensing gases to liquids,

sensing means including an array of sensors,

means for introducing the liquids or gases to said sensing means, said array including at least two sensors having different electrical responses to the liquids or gases dependent on the interaction of the liquids or gases with each of said sensors and upon an operational condition of at least one of said sensors,

means for changing an operational condition of at least one of said sensors to provide a plurality of different responses from said at least one sensor,

means for forming a response pattern from said sensing means upon exposure to a liquid or gas sample,

means for providing a plurality of previously established response patterns, and

means for comparing the formed response pattern with at least one previously established response pattern to identify the component of the gases, liquids and solids.

10. An instrument according to claim 9 wherein said sensing means comprises liquid sensors having differing electrical responses to liquids dependent on the interaction of liquids with each of said liquid sensors.

11. An instrument according to claim 10 wherein a said liquid sensors comprise at least one sensor selected from the group consisting of ultraviolet sensors, electrochemical sensors, refractive index sensors and conductimetric sensors.

12. An instrument for identifying at least one component of liquids and solids comprising:

means for changing solids to gases or liquids, or liquids to gases, said means including at least one heating element means for heating liquids and solids, a block of heat-resistant material having a chamber therein, a sample container adapted to fit within said chamber along with said heating element means such that said container is contacted with said heating element means, and means for sealing said chamber from the atmosphere,

sensing means including an array of sensors,

means for introducing the liquids or gases to said sensing means,

said array including at least two sensors having different electrical responses to the gases or liquids dependent on the interaction of the gases or liquids with each of said sensors and upon at least one property of the gases or liquids,

means for changing at least one property of the gases or liquids,

means for forming a response pattern from said sensing means upon exposure to a gas or liquid sample,

means for providing a plurality of previously established response patterns, and

means for comparing the formed response pattern with at least one previously established response pattern to identify the component of the liquids and solids.

13. An instrument in accordance with claim 12 wherein said means for changing solids to liquids or gases or liquids to gases further comprises a fluid inlet connected to said chamber at one end of said inlet, and a fluid outlet connected to said chamber at one end of said outlet and to said means for introducing fluids to said sensing means at a second end of said outlet.