Solid State Photomultiplier Quench Resistor Temperature Compensation
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Solution Overview
Problem
Conventional solid-state photomultipliers (SSPMs) are temperature-dependent, limiting their use in applications with wide temperature ranges, such as oil exploration and gas turbine engine environments, due to variations in gain that affect measurement accuracy and requiring additional hardware like cooling systems or bias voltage adjustments.
Innovation Solution
Incorporating a quench circuit with a quench resistor that exhibits a substantially constant temperature coefficient of resistance over a selected temperature range, allowing the SSPM to maintain stable performance and low light level detection across a wide temperature range without additional cooling or hardware.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional SSPMs are used without temperature compensation, then device complexity is reduced, but measurement precision deteriorates due to temperature-dependent gain variations
Solution Approach 1:
The patent changes the material parameter of the quench resistor to have a temperature coefficient of resistance that compensates for the temperature-dependent breakdown voltage variations of the APDs. By selecting a resistor material with specific temperature characteristics, the circuit automatically compensates for temperature effects without adding complex control systems.
Solution Approach 2:
The quench resistor serves as an intermediary element that mediates between the temperature environment and the APD operation. It translates temperature variations into resistance changes that counteract the breakdown voltage shifts, thereby stabilizing the photomultiplier gain indirectly through this intermediate component.
2Measurement precision
If cooling systems or bias voltage adjustment circuitry are added to compensate for temperature dependence, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The quench resistor circuit provides self-service temperature compensation by using its own temperature-dependent resistance characteristics to automatically counteract temperature effects on APD breakdown voltage. The system compensates for temperature variations intrinsically through the resistor's physical properties without requiring external control systems.
Solution Approach 2:
The patent exploits the temperature coefficient parameter of the quench resistor material to achieve automatic compensation. By carefully selecting the resistor's temperature coefficient, the system transforms the temperature parameter's effect from harmful to beneficial, eliminating the need for active temperature control mechanisms.
3Ease of manufacture
If conventional quench resistors are used, then ease of manufacture is improved, but reliability deteriorates in wide temperature ranges due to gain variations
Solution Approach 1:
The patent modifies the selection criteria for quench resistors by specifying particular temperature coefficient values that enable wide-temperature-range operation. This parameter-based selection approach maintains ease of manufacture through standard resistor components while achieving improved reliability across extreme temperature conditions.
4Measurement precision
If additional hardware for temperature compensation is added, then measurement precision is improved, but cost increases
Solution Approach 1:
The existing quench resistor circuit performs dual functions: its traditional role in quenching APD avalanches and an additional temperature compensation function. This self-service approach eliminates the need for separate temperature compensation hardware, maintaining cost-effectiveness while improving measurement precision.
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
The solution enables SSPMs to operate effectively in harsh temperature environments, maintaining low dark current and improved timing resolution while avoiding temperature constraints, thus enhancing their reliability and versatility in various applications.
Implementation Method 1
The quench circuit includes at least one quench resistor configured to exhibit a substantially constant temperature coefficient of resistance over a selected temperature range
Implementation Method 2
The solid state photomultiplier includes at least one microcell configured to generate an initial analog signal when exposed to optical photons
Implementation Method 3
The radiation detector module includes a scintillator layer configured to generate photons in response to incident radiation
Implementation Method 4
The solid state photomultiplier integrates a dense array of small avalanche photodiodes (APD) operating in Geiger mode, i.e., well above the avalanche breakdown voltage
Data Source
AI summary
A solid state photomultiplier includes at least one microcell configured to generate an initial analog signal when exposed to optical photons. The solid state photomultiplier further includes a quench circuit electrically coupled with the at least one microcell. The quench circuit includes at least one quench resistor configured to exhibit a substantially constant temperature coefficient of resistance over a selected temperature range.