Remote Vapor Detection via Target Heating
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Solution Overview
Problem
Current remote detection methods for hazardous and controlled substances with low vapor pressures, such as explosives and chemical agents, face challenges in achieving sufficient signal-to-noise ratio (SNR) for effective detection at ambient temperatures, limiting their ability to detect materials with very low vapor concentrations from standoff distances.
Innovation Solution
A method and system that uses a heating source to increase the vapor pressure of target materials from a remote distance, combined with active or passive remote sensing systems, to enhance the interaction between the material vapor and sensor radiation, thereby increasing the detectability of low concentration vapors by an order of magnitude or greater.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If laser power is increased to improve vapor detection probability, then signal-to-noise ratio increases by square root of laser power, but this provides only modest gain compared to order of magnitude improvement required
Solution Approach 1:
The patent changes the temperature parameter of the target material by applying localized heating. This increases the vapor pressure and vapor concentration of the target material, thereby enhancing the interaction between vapor and sensor radiation. The heating transforms the target material from a state with very low vapor concentration to one with significantly enhanced vapor concentration, achieving the required order of magnitude improvement in detection probability without proportionally increasing laser power.
2Measurement precision
If receiver telescope aperture is increased to collect more light and increase SNR, then more light is collected, but portability is limited and ability to be covert decreases
Solution Approach 1:
The patent changes the vapor concentration parameter of the target material through localized heating rather than changing the receiver aperture. By increasing the vapor pressure and vapor concentration of the heated target material, the interaction between vapor and sensor radiation is enhanced, achieving improved signal-to-noise ratio without requiring a larger receiver aperture. This maintains system portability and covert capabilities.
3Measurement precision
If lower noise photodetection hardware is used to increase sensitivity, then sensor sensitivity improves, but ultimate sensitivity is determined by photon shot noise
Solution Approach 1:
The patent changes the concentration parameter of the vapor by heating the target material, thereby increasing vapor pressure and vapor concentration. This enhancement of the target material's vapor state increases the interaction with sensor radiation, pushing the detection capability beyond the fundamental photon shot noise limit that constrains purely sensor-based sensitivity improvements.
4Measurement precision
If signal integration over long time periods is used to enhance detection, then detection sensitivity improves, but time resolution degrades and target dynamics may change
Solution Approach 1:
The patent changes the vapor concentration parameter through localized heating, creating a enhanced vapor state that provides sufficient signal strength for detection without requiring long integration times. This allows for rapid detection with high time resolution, capturing dynamic target changes that would be missed by prolonged signal integration methods.
5Measurement precision
If sensor-to-target distance is reduced to increase SNR, then signal-to-noise ratio increases linearly, but this is not possible for airborne applications and non-cooperative targets
Solution Approach 1:
The patent changes the vapor pressure and vapor concentration parameters of the target material through localized heating. This enhancement of the target material's vapor state increases the interaction between vapor and sensor radiation, achieving improved signal-to-noise ratio at fixed standoff distances. This enables detection in airborne applications and against non-cooperative targets where reducing sensor-to-target distance is not feasible.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly improves the probability of detecting hazardous materials by increasing the vapor concentration, allowing for reliable detection at all ranges of interest, even for materials with very low ambient vapor pressures, and is applicable in various security, forensic, and environmental applications.
Implementation Method 1
heating the material with a heating source from a remote distance to effectively increase a temperature of the material and to effectively increase a vapor pressure of the material
Implementation Method 2
active (laser-based) and passive (solar or thermal based) remote vapor detection and identification... due to the small interaction (e.g. light absorption) between the vapor material and the sensor radiation
Data Source
AI summary
There is provided a method for detecting a target material, preferably a solid or liquid target material. The method may comprise the steps of targeting a material for analysis, heating the material with a heating source from a remote distance to effectively increase a temperature of the material and to effectively increase a vapor pressure of the material in an environment adjacent to the material, measuring with a sensor the material vapor in the adjacent environment from the remote distance, and detecting the identity of the material using data generated during the measuring step. There is also provided a system for detecting a target material having a low vapor pressure comprising a first energy generating source, a sensor for measuring properties of gaseous materials from a standoff distance, the sensor producing data, and a computer for determining the target material based on the data produced by the sensor.