Spectral Characteristics¶
This page contains 11 requirements.
Page summary¶
Metric |
Value |
|---|---|
Total requirements |
11 |
Status: Compliant |
10 |
Status: N/A |
1 |
Verification: Test |
8 |
Verification: Design |
3 |
Result: PASS |
10 |
Result: Very nearly hit on Nice to Have |
1 |
Requirements¶
NGPS-SCI-REQ-0010 — The observable wavelengths of NGPS shall span 360 nm (330 nm goal) to 1000 nm (…¶
Field |
Value |
|---|---|
Identifier |
NGPS-SCI-REQ-0010 |
Source |
NGPS.SCI.DRD.001.docx |
Source section |
3.1 |
Category / request |
Spectral Characteristics |
Importance |
Must Have |
Feature |
Yes |
Status |
Compliant |
Verification method |
Test |
Result |
PASS |
Requirement
The observable wavelengths of NGPS shall span 360 nm (330 nm goal) to 1000 nm (1100 nm goal).
Notes / verification evidence
310-1050 achieved. arc data + domeflats
NGPS-SCI-REQ-0020 — There shall be at least one mode of operation where the entire wavelength range…¶
Field |
Value |
|---|---|
Identifier |
NGPS-SCI-REQ-0020 |
Source |
NGPS.SCI.DRD.001.docx |
Source section |
3.1 |
Category / request |
Spectral Characteristics |
Importance |
Must Have |
Status |
Compliant |
Verification method |
Design |
Result |
PASS |
Requirement
There shall be at least one mode of operation where the entire wavelength range of 360 nm (330 nm goal) to 1000 nm (1100 nm goal) is observable simultaneously.
Notes / verification evidence
All 4 channels can operate concurrently
NGPS-SCI-REQ-0030 — The total system throughput (from sky to detected photons) at the wavelength of…¶
Field |
Value |
|---|---|
Identifier |
NGPS-SCI-REQ-0030 |
Source |
NGPS.SCI.DRD.001.docx |
Source section |
3.1 |
Category / request |
Spectral Characteristics |
Importance |
Must Have |
Status |
Compliant |
Verification method |
Test |
Result |
PASS |
Requirement
The total system throughput (from sky to detected photons) at the wavelength of peak efficiency shall exceed 35%.
Notes / verification evidence
Obs. of std star 10” slit used. 45.5% at 743 nm (r-channel)
NGPS-SCI-REQ-0031 — The average system throughput in the range 370-500 nm shall exceed 27%.¶
Field |
Value |
|---|---|
Identifier |
NGPS-SCI-REQ-0031 |
Source |
NGPS.SCI.DRD.001.docx |
Source section |
3.1 |
Category / request |
Spectral Characteristics |
Importance |
Must Have |
Status |
Compliant |
Verification method |
Test |
Result |
PASS |
Requirement
The average system throughput in the range 370-500 nm shall exceed 27%.
Notes / verification evidence
“
NGPS-SCI-REQ-0032 — The average system throughput in the range 500-750 nm shall exceed 31%.¶
Field |
Value |
|---|---|
Identifier |
NGPS-SCI-REQ-0032 |
Source |
NGPS.SCI.DRD.001.docx |
Source section |
3.1 |
Category / request |
Spectral Characteristics |
Importance |
Must Have |
Status |
Compliant |
Verification method |
Test |
Result |
PASS |
Requirement
The average system throughput in the range 500-750 nm shall exceed 31%.
Notes / verification evidence
“
NGPS-SCI-REQ-0033 — The system throughput in the range 750-1000 nm shall exceed 30%.¶
Field |
Value |
|---|---|
Identifier |
NGPS-SCI-REQ-0033 |
Source |
NGPS.SCI.DRD.001.docx |
Source section |
3.1 |
Category / request |
Spectral Characteristics |
Importance |
Must Have |
Status |
Compliant |
Verification method |
Test |
Result |
PASS |
Requirement
The system throughput in the range 750-1000 nm shall exceed 30%.
Notes / verification evidence
“
NGPS-SCI-REQ-0040 — The spectrograph shall deliver a resolving power with a 1.5 arcsec slit exceedi…¶
Field |
Value |
|---|---|
Identifier |
NGPS-SCI-REQ-0040 |
Source |
NGPS.SCI.DRD.001.docx |
Source section |
3.1 |
Category / request |
Spectral Characteristics |
Importance |
Must Have |
Status |
Compliant |
Verification method |
Test |
Result |
PASS |
Requirement
The spectrograph shall deliver a resolving power with a 1.5 arcsec slit exceeding R = 1300 over the full observable range specified in NGPS-SCI-REQ-010.
Notes / verification evidence
CF: achieved, arcs+sky obs. measure R>1500
NGPS-SCI-REQ-0050 — Each channel of the spectrograph should have a mode capable of R > 4500¶
Field |
Value |
|---|---|
Identifier |
NGPS-SCI-REQ-0050 |
Source |
NGPS.SCI.DRD.001.docx |
Source section |
3.1 |
Category / request |
Spectral Characteristics |
Importance |
Nice to Have |
Status |
Compliant |
Verification method |
Test |
Result |
PASS |
Requirement
Each channel of the spectrograph should have a mode capable of R > 4500
Notes / verification evidence
PASS using narrowest slice. Center slice is median R~4000 at 0.4” slit
NGPS-SCI-REQ-0060 — As a goal (not a requirement), the spectral range of the R > 4500 mode should c…¶
Field |
Value |
|---|---|
Identifier |
NGPS-SCI-REQ-0060 |
Source |
NGPS.SCI.DRD.001.docx |
Source section |
3.1 |
Category / request |
Spectral Characteristics |
Importance |
Nice to Have |
Status |
N/A |
Verification method |
Test |
Result |
Very nearly hit on Nice to Have |
Requirement
As a goal (not a requirement), the spectral range of the R > 4500 mode should cover at least 1/3 of the channel.
Notes / verification evidence
I channel marginal at 0.4” slit
Actions
Would be good to take 0.37” arcs 1x1 binned at best focus for final confirmation
NGPS-SCI-REQ-0070 — As a goal (not a requirement), any wavelength in the channel should be availabl…¶
Field |
Value |
|---|---|
Identifier |
NGPS-SCI-REQ-0070 |
Source |
NGPS.SCI.DRD.001.docx |
Source section |
3.1 |
Category / request |
Spectral Characteristics |
Importance |
Nice to Have |
Status |
Compliant |
Verification method |
Design |
Result |
PASS |
Requirement
As a goal (not a requirement), any wavelength in the channel should be available (e.g., through changing the angle of the grating) to the R > 4500 mode, though not necessarily in one exposure.
Notes / verification evidence
Gratings fixed in final design.
NGPS-SCI-REQ-0080 — The spectrograph shall offer a variety of slit widths ranging from 1 arcsec (0….¶
Field |
Value |
|---|---|
Identifier |
NGPS-SCI-REQ-0080 |
Source |
NGPS.SCI.DRD.001.docx |
Source section |
3.1 |
Category / request |
Spectral Characteristics |
Importance |
Must Have |
Status |
Compliant |
Verification method |
Design |
Result |
PASS |
Requirement
The spectrograph shall offer a variety of slit widths ranging from 1 arcsec (0.5 arcsec goal) to 5 arcsec (8 arcsec goal).
Notes / verification evidence
0.35 to 10” achieved