DESIGN AND STRUCTURAL ANALYSIS
8.2 Future Work
This dissertation takes the TRL of the OPRA instrumentation concept to level 3, which is defined by NASA to be the demonstration either analytically or experimentally the proof of concept of
121 critical functions of the proposed instrument. In order to take this to a higher TRL level a standalone prototype would need to be manufactured and tested under realistic expected conditions and would need to go through rigorous space qualification testing.
The OPRA instrumentation concept fulfills NASA’s need for continued subsurface exploration and is relatively simple, and inexpensive, when compared to complex corers, drills and excavators. Due to the robustness, flexibility and scalability of a “spike like” fiber optic instrument, it could easily be incorporated onto the end of a robotic arm or even into a stand-alone instrument to be used by an astronaut.
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126 Appendix 1
Tables, Plots and Code
127 Appendix 1.1
Fiber Optic Bundle Characteristics (Plots)
128
129 Appendix 1.2
Numerical Model Core MatLabCode
%code to model fiber optic probe Pre run Variables clear all; clc ; tic
[In_Variables, headertext] = xlsread('Code_Inputs.xls', 'Variable_Input');
%user spreadsheet lcoated in same folder as program to read in variables
; %Set Up========================================
Total_Number_of_Models=In_Variables(1,1)
%this is the number of models that have been defined in the spreadsheet array_config_case=In_Variables(3,1)
sample_grid_res=In_Variables(5,1) %Sample grid resolution rec_grid_res=In_Variables(7,1) %Receiving fibers grid resolution
%
==============================================================
%=============================================================
dsample_min=In_Variables(9,1) %start sample distance dsample_max=In_Variables(11,1) %end sample distance dsample_high_res_distance=In_Variables(13,1)
%high res distance, close to sample we want very small changes in distance
%as this is the most sensitive area, as we move away, we can reduce resolution %---
dsample_high_res_step_count=In_Variables(15,1)
%how many steps between dample min and dsample_high_res_distance dsample_low_res_step_count=In_Variables(17,1)
%---
dsample_total_steps=dsample_high_res_step_count+dsample_low_res_step_count
%total number of steps %---
dsample_high_res_step_size=(dsample_high_res_distance-dsample_min)/dsample_high_res_step_count
dsample_low_res_step_size=(dsample_max-dsample_high_res_distance)/dsample_low_res_step_count %---
for Current_Model_Run=1:Total_Number_of_Models;
; %Physical Properties
num_rec_fibers=In_Variables(Current_Model_Run,3);
%how many receiving fibers
fiber_separation= In_Variables(Current_Model_Run,4)
% microns, this is core center to core center between 2 fibers rec_core_diam= In_Variables(Current_Model_Run,5); %microns rec_clad_diam= In_Variables(Current_Model_Run,6); %microns
130 rec_NA= In_Variables(Current_Model_Run,7); %no units
trans_core_diam=In_Variables(Current_Model_Run,8); %microns trans_clad_diam=In_Variables(Current_Model_Run,9); %microns trans_NA=In_Variables(Current_Model_Run,10); %no units %derived from above
area_600_micron=pi*300^2;
%standard is based around a 600 micron diamter fiber
power_from_send_fiber=(pi*(trans_core_diam/2)^2)/area_600_micron;
%scales power to surface area in realation to a 600 micron fiber power
%ie a 600micron fiver send power will be 1
%=============================================
sample_grid=[sample_grid_res,sample_grid_res,5];
% sample_grid[,,1]=x % sample_grid[,,2]=y
% sample_grid[,,3]=illum FLAG
% sample_grid[,,4]=samp_illum_cross_over_flag % sample_grid[,,5]=
;%Set Up Receive Grid
rec_grid_step_size=rec_core_diam/rec_grid_res;
%set the sample grid to a tight square arund the ilumination area
rec_grid =[rec_grid_res,rec_grid_res,5]; %this is all results in one multi dim array illum_flag_rec_grid=[sample_grid_res , sample_grid_res];
% rec_grid[,,1]=x dsample=dsample_min-dsample_high_res_step_size;
stack_samp_illum_cross_over_flag=zeros(sample_grid_res);
131 for dcount=1:dsample_total_steps;
if dcount<=dsample_high_res_step_count;
dsample=dsample+dsample_high_res_step_size
[pdf_function,tot_pdf_at_d]=calculate_transmit_flux(array_config_case, fiber_separation, trans_NA, rec_NA, num_rec_fibers , dsample, sample_grid_res);
; %set up rec grid
y=rec_core_diam/2; %this is max rec grid height for I =1:rec_grid_res;%move down the grid x=-(rec_core_diam/2);
%this sets up loop to start at far left of grid. zero is center of fiber for j=1 : sample_grid_res; %move across the grid
rec_grid(i,j,1)=x;
rec_grid(i,j,2)=y;
if (((x^2)+y^2)^0.5)< rec_core_diam/2;
rec_grid(i,j,3)=1;
%this grid is square in shape when infact the fiber is round,
%this corrects for this and flags only "active" points else sample_grid(i,j,3)=0;
illum_r_max=dsample*tan(asin(trans_NA)); %is a function of dist from probe tip illum_area=pi*illum_r_max^2;
sample_grid_step_size=(2*illum_r_max)/sample_grid_res;
%tight grid around illum area only
sample_grid_step_area=(sample_grid_step_size)^2; %actual physical surface area flux_at_send_fiber=1;
%power_from_send_fiber/sample_grid_step_area; %units of power/mm^2 rec_grid_step_area=(rec_grid_step_size)^2;
%move thios to a moe logical position in code %populate sample_grid probe is at center
y=illum_r_max;
132 for I=1:sample_grid_res; %populate sample grid with x y illum flag
x=-illum_r_max;
for I=1:sample_grid_res; %populate sample grid with illum rec cross over area flag for j=1:sample_grid_res;
x_rec_pos_mapped_to_samp_grid=sample_grid(i,j,1)-(fiber_separation);
dist_to_point=abs((x_rec_pos_mapped_to_samp_grid^2)+y^2)^0.5;
;%calcualte distance from samaple grid point to rec grid point and sum up all flux for I=1:rec_grid_res;
133
%all contributions and store this sum else continue;
end;
end;
end ;
rec_grid(i,j,6)=total_power_at_rec_grid_point;
%once all cross over illum points are summed save results m %move to next point
end;
end;
%=========================================================
;%Begin extractoin ---
%seperate multi dimension arrays to series of 2d arrays ---
%--- ;%define rec_grid 2d extraction arrays --- x_rec_grid=[rec_grid_res,rec_grid_res];
y_rec_grid=[rec_grid_res,rec_grid_res];
illum_flag_rec_grid=[rec_grid_res,rec_grid_res];
power_received_at_rec_grid_points=[rec_grid_res,rec_grid_res];
for I=1:rec_grid_res;
134 ;%define sample_grid 2d extraction arrays --- x_sample_grid=[sample_grid_res,sample_grid_res];
y_sample_grid=[sample_grid_res,sample_grid_res];
illum_flag_sample_grid=[sample_grid_res,sample_grid_res];
for I=1:sample_grid_res;
illum_flag_rec_grid=int8(illum_flag_rec_grid);
%--- %x_sample_grid=int8(x_sample_grid);
% y_sample_grid=int8(y_sample_grid);
illum_flag_sample_grid=int8(illum_flag_sample_grid);
samp_illum_cross_over_flag=int8(samp_illum_cross_over_flag);
stack_total_power_at_rec_grid_points(dcount)=total_power_for_all_rec_points;
samp_illum_cross_over_flag=samp_illum_cross_over_flag+illum_flag_sample_grid;
%so we have non illum and illum on one matrix
135
%save results for export to excel
results_name{1}= 'Sample Distance (mm)';
results_name{2}= 'Illumination Surface Area (mm^2)';
results_name{3}= 'Illumination Spot Diamter';
results_name{4}= 'Cross Over Surface Area (mm^2)';
results_name{5}= 'Total Returned Power';
136
%qiock ploit of power v distance from probe
% results_name{5}= 'rec_NA'; results_list_value{5}=rec_NA;
% results_name{6}=
'trans_core_diam';results_list_value{6}=trans_core_diam;
% results_name{7}= 'trans_clad_diam';
results_list_value{7}=trans_clad_diam;
% results_name{8}= 'trans_NA'; results_list_value{8}=trans_NA;
%Below code is used to produce plots if and when needed
% %reduced arrays to either a 1 or 0 flag this helps plot arrays
137 Appendix 1.3
Other Research Validating FOB.
List of publications validating the FOB adapted for other projects, for use by other members of the space center:
Key: ASR: Advances in Space Research, LPSC Lunar & Planetary Space Conference EPSC-DPS European Planetary Science Congress - Division of Planetary Sciences
1. A FACILITY FOR SIMULATING TITAN'S ENVIRONMENT ASR 2012 (F. C. Wasiak et al., 2012)