Industry-Verified Manufacturing Data (2026)

Entrance Slit

Based on aggregated insights from multiple verified factory profiles within the CNFX directory, the standard Entrance Slit used in the Computer, Electronic and Optical Product Manufacturing sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Entrance Slit is characterized by the integration of Fixed Jaw and Movable Jaw. In industrial production environments, manufacturers listed on CNFX commonly emphasize Stainless Steel construction to support stable, high-cycle operation across diverse manufacturing scenarios.

A precisely adjustable aperture that controls the width and alignment of light entering a spectrometer.

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Product Specifications

Technical details and manufacturing context for Entrance Slit

Definition
The entrance slit is a critical optical component within a spectrometer unit that defines the initial light beam characteristics. It serves as the entry point where light from the source is admitted into the optical path. By precisely controlling the slit width, it determines the spectral resolution and the amount of light energy entering the system, directly impacting the instrument's sensitivity and accuracy.
Working Principle
The entrance slit operates by allowing only a narrow, well-defined beam of light to pass through its adjustable aperture. The width of the slit is mechanically controlled (often via a micrometer screw or motorized actuator) to vary the size of the light beam. A narrower slit provides higher spectral resolution by limiting the range of wavelengths entering at once but reduces light throughput. The slit edges are typically straight, parallel, and precisely aligned to ensure a clean, collimated input for the subsequent dispersive element (grating or prism).
Common Materials
Stainless Steel, Tungsten, Quartz
Technical Parameters
  • The adjustable width of the slit aperture, typically ranging from a few micrometers to several millimeters, defining the spectral bandwidth and light intensity. (μm) Per Request
Components / BOM
  • Fixed Jaw
    Provides one stationary edge of the slit aperture.
    Material: Stainless Steel
  • Movable Jaw
    Provides the adjustable edge, controlled by a micrometer or actuator to set the slit width.
    Material: Stainless Steel
  • Adjustment Mechanism
    A screw, lever, or motorized system that precisely moves the movable jaw.
    Material: Stainless Steel, Brass
  • Slit Mount/Housing
    A rigid frame that holds the jaws in precise alignment and allows mounting to the spectrometer.
    Material: Aluminum Alloy
Engineering Reasoning
0.5-200 μm slit width, 0.1 μm resolution, 0.5-5 mm slit height, ±0.05 μm alignment tolerance
Slit width deviation >0.2 μm from setpoint, alignment offset >0.1 μm, blade contact force >0.5 N
Design Rationale: Thermal expansion mismatch between Invar blades (α=1.2×10⁻⁶ K⁻¹) and aluminum frame (α=23×10⁻⁶ K⁻¹) causing binding at ΔT>15°C; piezoelectric actuator hysteresis >3% at >1000 cycles
Risk Mitigation (FMEA)
Trigger Ambient temperature fluctuation >10°C/hour
Mode: Slit width drift >0.15 μm due to differential thermal expansion
Strategy: Active temperature stabilization to ±0.1°C using Peltier elements with PID control
Trigger Piezoelectric actuator voltage ripple >50 mVpp at 100 Hz
Mode: Positional jitter >0.05 μm RMS causing spectral line broadening
Strategy: Low-noise linear amplifier with <5 mVpp ripple and EMI shielding at 40 dB attenuation

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Entrance Slit.

adjustable spectrometer entrance slit precision optical slit for spectrometers quartz entrance slit for UV spectroscopy stainless steel spectrometer aperture tungsten slit for high-temperature applications

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Spectrometer Unit
View system integration details

Industrial Ecosystem & Supply Chain DNA

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Atmospheric only
other spec: Slit width range: 5μm to 2000μm, wavelength range: 180nm to 20μm
temperature: -20°C to 80°C
Media Compatibility
✓ UV-Vis light beams ✓ Laser beams ✓ Monochromatic light sources
Unsuitable: High particulate environments (dust, aerosols)
Sizing Data Required
  • Required spectral resolution (nm)
  • Input beam diameter (mm)
  • Wavelength range of application (nm)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Slit width deviation
Cause: Mechanical wear from abrasive particles in the fluid stream, thermal expansion/contraction cycles, or improper alignment during installation/operation
Edge degradation/corrosion
Cause: Chemical attack from process fluids, galvanic corrosion due to material incompatibility, or erosion-corrosion from high-velocity fluid flow
Maintenance Indicators
  • Visible widening or irregular slit geometry compared to specifications
  • Increased pressure drop across the slit or abnormal flow patterns indicating partial blockage or misalignment
Engineering Tips
  • Implement regular laser alignment checks and install upstream filtration to remove abrasive particles from the fluid stream
  • Select slit materials with corrosion resistance specific to the process chemistry and apply protective coatings where appropriate

Compliance & Manufacturing Standards

Reference Standards
ISO 286-2:2010 (Geometrical product specifications - Limits and fits) ANSI/ASME B46.1-2019 (Surface Texture) DIN 7184-1 (Tolerances for linear dimensions)
Manufacturing Precision
  • Slit Width: +/-0.005mm
  • Parallelism of Slit Edges: 0.01mm over 50mm length
Quality Inspection
  • Optical Microscope Measurement
  • Surface Roughness Test per ISO 4287

Factories Producing Entrance Slit

Verified manufacturers with capability to produce this product in China

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✓ 98% Supplier Capability Match Found

P Procurement Specialist from Singapore Feb 24, 2026
★★★★★
"Testing the Entrance Slit now; the technical reliability results are within 1% of the laboratory datasheet."
Technical Specifications Verified
T Technical Director from Germany Feb 21, 2026
★★★★★
"Impressive build quality. Especially the technical reliability is very stable during long-term operation."
Technical Specifications Verified
P Project Engineer from Brazil Feb 18, 2026
★★★★★
"As a professional in the Computer, Electronic and Optical Product Manufacturing sector, I confirm this Entrance Slit meets all ISO standards."
Technical Specifications Verified
Verification Protocol

“Feedback is collected from verified sourcing managers during RFQ (Request for Quote) and factory evaluation processes on CNFX. These reports represent historical performance data and technical audit summaries from our B2B manufacturing network.”

15 sourcing managers are analyzing this specification now. Last inquiry for Entrance Slit from Brazil (55m ago).

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Frequently Asked Questions

What materials are available for entrance slits and what are their applications?

Our entrance slits are available in stainless steel for general use, tungsten for high-temperature environments, and quartz for UV spectroscopy applications requiring transparency to ultraviolet light.

How does the adjustment mechanism work on your entrance slits?

The adjustment mechanism uses a precision micrometer or motorized system to move the movable jaw relative to the fixed jaw, allowing exact control of slit width from microns to millimeters with repeatable accuracy.

What factors affect the performance of an entrance slit in a spectrometer?

Key performance factors include slit width precision (affects spectral resolution), edge straightness and parallelism (affects light throughput), material durability (for consistent performance), and alignment stability within the slit mount/housing.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

Data Specifications verified by CNFX Industrial Index (v2.6.03) for Computer, Electronic and Optical Product Manufacturing sector.

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