Pulse-Echo Ranging Variable Threshold Voltage Control
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Solution Overview
Problem
Pulse-echo ranging systems face a trade-off between measurement accuracy and update time due to fixed threshold voltage, which limits flexibility and reliability in optimizing measurement speed and timing specifications.
Innovation Solution
A pulse-echo ranging system with a microprocessor-controlled variable threshold voltage mechanism that adjusts the energy reservoir's voltage to optimize echo confidence and update time, allowing incremental changes based on measurement reliability and user-defined settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed threshold voltage is used to control transducer transmission, then measurement accuracy is improved through consistent echo strength, but update time increases due to fixed charging requirements
Solution Approach 1:
The patent applies dynamics by transitioning from a fixed threshold voltage to a variable threshold voltage that can be dynamically adjusted. The microprocessor modifies the threshold voltage based on real-time system conditions, allowing the system to optimize between measurement accuracy and update time flexibly, rather than being constrained by a static value.
Solution Approach 2:
The patent changes the parameter of threshold voltage from fixed to variable. By allowing the threshold voltage to change based on system state (such as energy reservoir charge level), the system can adaptively balance the trade-off between achieving sufficient echo strength for accuracy and maintaining rapid update rates.
2Reliability
If a higher threshold voltage is used to improve echo strength and confidence, then measurement reliability is improved, but the time between consecutive measurements increases
Solution Approach 1:
The system dynamically adjusts the threshold voltage based on current operational conditions. When high reliability is needed, the threshold can be raised; when faster updates are prioritized, the threshold can be lowered. This dynamic adaptation resolves the contradiction between reliability and productivity by allowing flexible optimization rather than fixed compromise.
Solution Approach 2:
The microprocessor monitors system conditions and provides feedback to adjust the threshold voltage accordingly. This feedback mechanism enables the system to learn from previous measurements and energy reservoir states, optimizing the threshold voltage to achieve both reliable measurements and acceptable update rates simultaneously.
3Loss of time
If a constant threshold voltage is stored in memory to meet specifications, then measurement timing requirements are satisfied, but flexibility to optimize beyond specifications is lost
Solution Approach 1:
The patent transforms the static constant threshold voltage into a dynamic variable that can be adjusted by the microprocessor. This enables the system to meet minimum specification requirements while also providing the flexibility to optimize performance beyond those specifications based on actual operational needs, environmental conditions, or application-specific requirements.
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 enhances measurement accuracy and reduces the time between consecutive measurements by dynamically adjusting the energy output, improving the system's flexibility and reliability while maintaining satisfactory measurement quality.
Implementation Method 1
Ultrasonic pulses or microwave signals are typically used in pulse-echo systems. The transducer both sends and receives pulses.
Implementation Method 2
The system typically includes an energy reservoir (for example, for loop powered applications) which is coupled to the transducer. The energy reservoir stores the leftover energy that is not consumed by the other power-consuming components in the circuit.
Implementation Method 3
The microprocessor typically includes a code component (i.e. function or routine) that monitors the reservoir voltage and only allows the transducer to transmit when the reservoir voltage is above a threshold voltage level.
Implementation Method 4
Pulse-echo ranging systems determine the distance to a reflective surface (i.e. reflector) by measuring the length of time following a transmission of a burst of energy pulses that the echo or reflected pulse is received.
Implementation Method 5
The transducer both sends and receives pulses.
Data Source
AI summary
A method and apparatus for controlling pulses in a pulse-echo level measurement or time-of-flight ranging system. The apparatus comprises a controller, a transducer, and an energy storage device. The energy storage device is operatively coupled to the transducer through a relay. The relay is enabled and disabled by the controller and in the disabled state the energy storage device is allowed to accumulate energy. The energy is stored in the energy storage at a variable voltage level. The controller includes a component for determining a voltage level corresponding to an acceptable confidence level for echo pulses. The controller includes another component for determining a voltage level an increased response time.