On-the-go optical spectroscopy soil analyzer

• US 5,461,229 A
• Filed: 06/06/1994
• Issued: 10/24/1995
• Est. Priority Date: 06/06/1994
• Status: Expired due to Fees

• Current Assignee: Lockheed Martin Corporation (Martin Marietta Corporation)
• Original Assignee: Unisys Corporation
• Inventors: Nelson, George F., Sauter, Gerald F.
• Primary Examiner(s): Fields, Carolyn E.
• Assistant Examiner(s): Glick, Edward J.
• Application Number:
  US08/254,903
• Time in Patent Office: 505 Days
• Field of Search: 250/253, 250/339.07, 250/339.08, 250/339.14, 250/341.1, 250/341.6, 250/358.1, 250/359.1, 250/340, 250/339.11, 250/339.12, 250/341.2 , 250/341.8
• US Class Current: 250/253
• CPC Class Codes: G01N 21/71 thermally excited
• CPC Class Codes: G01N 21/8507 Probe photometers, i.e. with optical measuring part dipped into fluid sample
• CPC Class Codes: G01N 33/24 Earth materials G01N33/42 takes precedence
• CPC Class Codes: G01V 8/02 Prospecting

Abstract

An on-the-go probe for determining the presence of chemical residue in a soil using Transient Infrared Spectroscopy by pulling a soil implement through the soil with the soil implement having a heating or cooling source for temporarily creating a temperature differential between a layer of soil proximate the soil implement and a layer of soil remote from the soil implement, and moving the soil sufficiently fast with respect to heating source to enable measuring the radiation characteristics of the thin layer of soil before the thin layer of soil begins to self-absorb and substantially change its emission characteristics.

Claims

1. An on-the-go probe for determining the presence of materials in a soil comprising:

a soil implement for pulling through the soil, said soil implement having a chamber therein;

means on said soil implement for creating a temperature differential between a layer of soil proximate said soil implement and a layer of soil remote from the soil implement by raising the temperature sufficiently high to generate a measurable thermal radiation change in a thin layer of soil proximate the soil implement;

a window located in said soil implement for transmission of the measurable thermal radiation change to a receiving instrument in the soil implement; and

further means for moving the soil implement sufficiently fast with respect to the thin layer of soil to enable measuring the radiation characteristics of the thin layer of soil before the thin layer of soil thickens sufficiently to substantially change its emission characteristics.

2. The on-the-go probe of claim 1 wherein said on-the-go probe includes an apparatus Ibr directing chemicals on to the soil in response to a measurement of materials in the soil.

3. The on-the-go probe of claim 1 wherein said on-the-go probe includes a heating element for heating the soil proximate the soil implement.

4. The on-the-go probe of claim 3 wherein the heating element comprises a ribbon heating element.

5. The on-the-go probe of claim 1 including a hydraulic cylinder for controlling the depth of the soil implement in the soil.

6. The on-the-go probe of claim 1 including a tank for holding a herbicide and means for spraying the herbicide on the ground in response to a measurement of contaminants in the soil.

7. The on-the-go probe of claim 1 including a tank for holding fertilizer and means liar spraying the fertilizer on the ground in response to a measurement of fertilizer deficiencies in the soil.

8. The on-the-go probe of claim 2 including a computer for comparing a measured signal from the on-the-go probe to a reference in the computer to determine a correctable amount of chemical to be applied to the soil in accordance with the measurements.

9. The on-the-go probe of claim 8 wherein the computer controls valves for increasing and decreasing the amount of chemical to be applied to the soil in accordance with a signal generated by the computer.

10. The on-the-go probe of claim 9 wherein the probe is directed vertically into the ground and the means on said soil implement pulses infrared radiation into the soil.

11. A method of producing in real time a sensor-proximate analysis of soil through optical spectroscopy comprising the steps of:

pulling an on-the-go probe through the soil;

irradiating the soil proximate the on-the-go probe to measurable radiation changes in a thin layer of soil proximate the on-the-go probe;

measuring the measurable radiation changes in a thin layer of soil proximate the on-the-go probe before the thin layer of soil thickens sufficiently to substantially change its emission characteristics; and

analyzing the thin layer of soil with a spectrometer to determine correctable deficiencies in the soil;

generating a control signal in accordance with the correctable deficiencies in the soil; and

applying a corrective chemical to the soil in accordance with a preprogramed schedule of responses for measured deficiencies.

12. An on-the-go probe for determining the presence of chemical residues in a soil comprising:

a soil implement located proximate a surface of the soil for displacement relative to the soil, said soil implement having a chamber therein;

a radiation source on said soil implement for creating a measurable temperature differential between a surface layer of soil proximate said soil implement and a layer of soil remote from the soil implement to generate a temporary and reversible measurable thermal radiation change in a thin layer of soil proximate the soil implement;

a window located in said soil implement for transmission of an emission spectra from the thin layer of soil proximate the probe to a receiving instrument in the soil implement; and

a member for moving the soil implement sufficiently fast with respect to the thin layer of soil to enable measuring the radiation characteristics of the thin layer of soil before the thin layer of soil thickens sufficiently to substantially change its emission characteristics.

13. An on-the-go probe for determining the presence of chemical residues in a soil comprising:

a soil implement for displacement relative to the soil, said soil implement having a chamber therein;

a radiation source on said soil implement for creating a measurable temperature differential between a layer of soil proximate said soil implement and a layer of soil remote from the soil implement to generate a measurable thermal radiation change in a thin layer of soil proximate the soil implement;

a window located in said soil implement for transmission of an emission spectra from the thin layer of soil proximate the probe to a receiving instrument in the soil implement; and

a member for moving the soil implement sufficiently fast with respect to the thin layer of soil to enable measuring the radiation characteristics of the thin layer of soil before the thin layer of soil thickens sufficiently to substantially change its emission characteristics; and

a spectrometer for measuring the radiation characteristics for determining the chemical residue in the soil and a computer for comparing the measured signal to a reference signal and means for applying corrective chemicals to the soil in accordance with the determined chemical residue measurements.